Kbuild updates for v5.4

- add modpost warn exported symbols marked as 'static' because 'static'
    and EXPORT_SYMBOL is an odd combination
 
  - break the build early if gold linker is used
 
  - optimize the Bison rule to produce .c and .h files by a single
    pattern rule
 
  - handle PREEMPT_RT in the module vermagic and UTS_VERSION
 
  - warn CONFIG options leaked to the user-space except existing ones
 
  - make single targets work properly
 
  - rebuild modules when module linker scripts are updated
 
  - split the module final link stage into scripts/Makefile.modfinal
 
  - fix the missed error code in merge_config.sh
 
  - improve the error message displayed on the attempt of the O= build
    in unclean source tree
 
  - remove 'clean-dirs' syntax
 
  - disable -Wimplicit-fallthrough warning for Clang
 
  - add CONFIG_CC_OPTIMIZE_FOR_SIZE_O3 for ARC
 
  - remove ARCH_{CPP,A,C}FLAGS variables
 
  - add $(BASH) to run bash scripts
 
  - change *CFLAGS_<basetarget>.o to take the relative path to $(obj)
    instead of the basename
 
  - stop suppressing Clang's -Wunused-function warnings when W=1
 
  - fix linux/export.h to avoid genksyms calculating CRC of trimmed
    exported symbols
 
  - misc cleanups
 -----BEGIN PGP SIGNATURE-----
 
 iQJSBAABCgA8FiEEbmPs18K1szRHjPqEPYsBB53g2wYFAl1+OnoeHHlhbWFkYS5t
 YXNhaGlyb0Bzb2Npb25leHQuY29tAAoJED2LAQed4NsGoKEQAKcid9lDacMe5KWT
 4Ic93hANMFKZ9Qy8WoxivnOr1a93NcloZ0Bhka96QUt7hYUkLmDCs99eMbxKuMfP
 m/ViHepojOBPzq+VtAGWOiIyPMCA7XDrTPph4wcPDKeOURTreK1PZ20fxDoAR4to
 +qaqKZJGdRcNf2DpJN1yIosz8Wj0Sa2LQrRi9jgUHi3bzgvLfL7P9WM2xyZMggAc
 GaSktCEFL0UzMFlMpYyDrKh2EV6ryOnN8+bVAKbmWP89tuU3njutycKdWOoL+bsj
 tH2kjFThxQyIcZGNHS1VzNunYAFE2q5nj2q47O1EDN6sjTYUoRn5cHwPam6x3Kly
 NH88xDEtJ7sUUc9GZEIXADWWD0f08QIhAH5x+jxFg3529lNgyrNHRSQ2XceYNAnG
 i/GnMJ0EhODOFKusXw7sNlWFKtukep+8/pwnvfTXWQu6plEm5EQ3a3RL5SESubVo
 mHzXsQDFCE0x/UrsJxEAww+3YO3pQEelfVi74W9z0cckpbRF8FuUq/69ltOT15l4
 X+gCz80lXMWBKw/kNoR4GQoAJo3KboMEociawwoj72HXEHTPLJnCdUOsAf3n+opj
 xuz/UPZ4WYSgKdnbmmDbJ+1POA1NqtARZZXpMVyKVVCOiLafbJkLQYwLKEpE2mOO
 TP9igzP1i3/jPWec8cJ6Fa8UwuGh
 =VGqV
 -----END PGP SIGNATURE-----

Merge tag 'kbuild-v5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:

 - add modpost warn exported symbols marked as 'static' because 'static'
   and EXPORT_SYMBOL is an odd combination

 - break the build early if gold linker is used

 - optimize the Bison rule to produce .c and .h files by a single
   pattern rule

 - handle PREEMPT_RT in the module vermagic and UTS_VERSION

 - warn CONFIG options leaked to the user-space except existing ones

 - make single targets work properly

 - rebuild modules when module linker scripts are updated

 - split the module final link stage into scripts/Makefile.modfinal

 - fix the missed error code in merge_config.sh

 - improve the error message displayed on the attempt of the O= build in
   unclean source tree

 - remove 'clean-dirs' syntax

 - disable -Wimplicit-fallthrough warning for Clang

 - add CONFIG_CC_OPTIMIZE_FOR_SIZE_O3 for ARC

 - remove ARCH_{CPP,A,C}FLAGS variables

 - add $(BASH) to run bash scripts

 - change *CFLAGS_<basetarget>.o to take the relative path to $(obj)
   instead of the basename

 - stop suppressing Clang's -Wunused-function warnings when W=1

 - fix linux/export.h to avoid genksyms calculating CRC of trimmed
   exported symbols

 - misc cleanups

* tag 'kbuild-v5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (63 commits)
  genksyms: convert to SPDX License Identifier for lex.l and parse.y
  modpost: use __section in the output to *.mod.c
  modpost: use MODULE_INFO() for __module_depends
  export.h, genksyms: do not make genksyms calculate CRC of trimmed symbols
  export.h: remove defined(__KERNEL__), which is no longer needed
  kbuild: allow Clang to find unused static inline functions for W=1 build
  kbuild: rename KBUILD_ENABLE_EXTRA_GCC_CHECKS to KBUILD_EXTRA_WARN
  kbuild: refactor scripts/Makefile.extrawarn
  merge_config.sh: ignore unwanted grep errors
  kbuild: change *FLAGS_<basetarget>.o to take the path relative to $(obj)
  modpost: add NOFAIL to strndup
  modpost: add guid_t type definition
  kbuild: add $(BASH) to run scripts with bash-extension
  kbuild: remove ARCH_{CPP,A,C}FLAGS
  kbuild,arc: add CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 for ARC
  kbuild: Do not enable -Wimplicit-fallthrough for clang for now
  kbuild: clean up subdir-ymn calculation in Makefile.clean
  kbuild: remove unneeded '+' marker from cmd_clean
  kbuild: remove clean-dirs syntax
  kbuild: check clean srctree even earlier
  ...

.gitignore

@@ -34,7 +34,6 @@
 *.mod.c
 *.o
 *.o.*
-*.order
 *.patch
 *.s
 *.so
@@ -46,6 +45,7 @@
 *.xz
 Module.symvers
 modules.builtin
+modules.order
 
 #
 # Top-level generic files

Documentation/kbuild/kbuild.rst

@@ -105,6 +105,15 @@ The output directory can also be specified using "O=...".
 
 Setting "O=..." takes precedence over KBUILD_OUTPUT.
 
+KBUILD_EXTRA_WARN
+-----------------
+Specify the extra build checks. The same value can be assigned by passing
+W=... from the command line.
+
+See `make help` for the list of the supported values.
+
+Setting "W=..." takes precedence over KBUILD_EXTRA_WARN.
+
 KBUILD_DEBARCH
 --------------
 For the deb-pkg target, allows overriding the normal heuristics deployed by
@@ -241,11 +250,6 @@ To get all available archs you can also specify all. E.g.::
 
     $ make ALLSOURCE_ARCHS=all tags
 
-KBUILD_ENABLE_EXTRA_GCC_CHECKS
-------------------------------
-If enabled over the make command line with "W=1", it turns on additional
-gcc -W... options for more extensive build-time checking.
-
 KBUILD_BUILD_TIMESTAMP
 ----------------------
 Setting this to a date string overrides the timestamp used in the
@@ -258,17 +262,3 @@ KBUILD_BUILD_USER, KBUILD_BUILD_HOST
 These two variables allow to override the user@host string displayed during
 boot and in /proc/version. The default value is the output of the commands
 whoami and host, respectively.
-
-KBUILD_LDS
-----------
-The linker script with full path. Assigned by the top-level Makefile.
-
-KBUILD_VMLINUX_OBJS
--------------------
-All object files for vmlinux. They are linked to vmlinux in the same
-order as listed in KBUILD_VMLINUX_OBJS.
-
-KBUILD_VMLINUX_LIBS
--------------------
-All .a "lib" files for vmlinux. KBUILD_VMLINUX_OBJS and KBUILD_VMLINUX_LIBS
-together specify all the object files used to link vmlinux.

Documentation/kbuild/makefiles.rst

@@ -471,21 +471,6 @@ more details, with real examples.
 	The second argument is optional, and if supplied will be used
 	if first argument is not supported.
 
-    cc-ldoption
-	cc-ldoption is used to check if $(CC) when used to link object files
-	supports the given option.  An optional second option may be
-	specified if first option are not supported.
-
-	Example::
-
-		#arch/x86/kernel/Makefile
-		vsyscall-flags += $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
-
-	In the above example, vsyscall-flags will be assigned the option
-	-Wl$(comma)--hash-style=sysv if it is supported by $(CC).
-	The second argument is optional, and if supplied will be used
-	if first argument is not supported.
-
     as-instr
 	as-instr checks if the assembler reports a specific instruction
 	and then outputs either option1 or option2
@@ -765,7 +750,8 @@ Files matching the patterns "*.[oas]", "*.ko", plus some additional files
 generated by kbuild are deleted all over the kernel src tree when
 "make clean" is executed.
 
-Additional files can be specified in kbuild makefiles by use of $(clean-files).
+Additional files or directories can be specified in kbuild makefiles by use of
+$(clean-files).
 
 	Example::
 
@@ -776,23 +762,8 @@ When executing "make clean", the file "crc32table.h" will be deleted.
 Kbuild will assume files to be in the same relative directory as the
 Makefile, except if prefixed with $(objtree).
 
-To delete a directory hierarchy use:
+To exclude certain files or directories from make clean, use the
-
+$(no-clean-files) variable.
-	Example::
-
-		#scripts/package/Makefile
-		clean-dirs := $(objtree)/debian/
-
-This will delete the directory debian in the toplevel directory, including all
-subdirectories.
-
-To exclude certain files from make clean, use the $(no-clean-files) variable.
-This is only a special case used in the top level Kbuild file:
-
-	Example::
-
-		#Kbuild
-		no-clean-files := $(bounds-file) $(offsets-file)
 
 Usually kbuild descends down in subdirectories due to "obj-* := dir/",
 but in the architecture makefiles where the kbuild infrastructure
@@ -988,13 +959,25 @@ When kbuild executes, the following steps are followed (roughly):
 	$(KBUILD_ARFLAGS) set by the top level Makefile to "D" (deterministic
 	mode) if this option is supported by $(AR).
 
-    ARCH_CPPFLAGS, ARCH_AFLAGS, ARCH_CFLAGS   Overrides the kbuild defaults
+    KBUILD_LDS
 
-	These variables are appended to the KBUILD_CPPFLAGS,
+	The linker script with full path. Assigned by the top-level Makefile.
-	KBUILD_AFLAGS, and KBUILD_CFLAGS, respectively, after the
-	top-level Makefile has set any other flags. This provides a
-	means for an architecture to override the defaults.
 
+    KBUILD_LDS_MODULE
+
+	The module linker script with full path. Assigned by the top-level
+	Makefile and additionally by the arch Makefile.
+
+    KBUILD_VMLINUX_OBJS
+
+	All object files for vmlinux. They are linked to vmlinux in the same
+	order as listed in KBUILD_VMLINUX_OBJS.
+
+    KBUILD_VMLINUX_LIBS
+
+	All .a "lib" files for vmlinux. KBUILD_VMLINUX_OBJS and
+	KBUILD_VMLINUX_LIBS together specify all the object files used to
+	link vmlinux.
 
 6.2 Add prerequisites to archheaders
 ------------------------------------
@@ -1139,7 +1122,7 @@ When kbuild executes, the following steps are followed (roughly):
 
     header-test-y
 
-	header-test-y specifies headers (*.h) in the current directory that
+	header-test-y specifies headers (`*.h`) in the current directory that
 	should be compile tested to ensure they are self-contained,
 	i.e. compilable as standalone units. If CONFIG_HEADER_TEST is enabled,
 	this builds them as part of extra-y.
@@ -1147,11 +1130,11 @@ When kbuild executes, the following steps are followed (roughly):
     header-test-pattern-y
 
 	This works as a weaker version of header-test-y, and accepts wildcard
-	patterns. The typical usage is:
+	patterns. The typical usage is::
 
 		header-test-pattern-y += *.h
 
-	This specifies all the files that matches to '*.h' in the current
+	This specifies all the files that matches to `*.h` in the current
 	directory, but the files in 'header-test-' are excluded.
 
 6.7 Commands useful for building a boot image

Kbuild

@@ -18,8 +18,6 @@ $(bounds-file): kernel/bounds.s FORCE
 
 timeconst-file := include/generated/timeconst.h
 
-targets += $(timeconst-file)
-
 filechk_gentimeconst = echo $(CONFIG_HZ) | bc -q $<
 
 $(timeconst-file): kernel/time/timeconst.bc FORCE
@@ -42,7 +40,6 @@ $(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
 # Check for missing system calls
 
 always += missing-syscalls
-targets += missing-syscalls
 
 quiet_cmd_syscalls = CALL    $<
       cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
@@ -54,13 +51,9 @@ missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
 # Check atomic headers are up-to-date
 
 always += old-atomics
-targets += old-atomics
 
 quiet_cmd_atomics = CALL    $<
       cmd_atomics = $(CONFIG_SHELL) $<
 
 old-atomics: scripts/atomic/check-atomics.sh FORCE
 	$(call cmd,atomics)
-
-# Keep these three files during make clean
-no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)

Makefile

@@ -230,6 +230,8 @@ endif
 
 export KBUILD_CHECKSRC KBUILD_EXTMOD
 
+extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
+
 ifeq ($(abs_srctree),$(abs_objtree))
         # building in the source tree
         srctree := .
@@ -271,52 +273,62 @@ no-dot-config-targets := $(clean-targets) \
 			 %asm-generic kernelversion %src-pkg
 no-sync-config-targets := $(no-dot-config-targets) install %install \
 			   kernelrelease
+single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
 
-config-targets  := 0
+config-build	:=
-mixed-targets   := 0
+mixed-build	:=
-dot-config      := 1
+need-config	:= 1
 may-sync-config	:= 1
+single-build	:=
 
 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
-		dot-config := 0
+		need-config :=
 	endif
 endif
 
 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
-		may-sync-config := 0
+		may-sync-config :=
 	endif
 endif
 
 ifneq ($(KBUILD_EXTMOD),)
-	may-sync-config := 0
+	may-sync-config :=
 endif
 
 ifeq ($(KBUILD_EXTMOD),)
         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
-                config-targets := 1
+		config-build := 1
                 ifneq ($(words $(MAKECMDGOALS)),1)
-                        mixed-targets := 1
+			mixed-build := 1
                 endif
         endif
 endif
 
+# We cannot build single targets and the others at the same time
+ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
+	single-build := 1
+	ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
+		mixed-build := 1
+	endif
+endif
+
 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
-                mixed-targets := 1
+		mixed-build := 1
         endif
 endif
 
 # install and modules_install need also be processed one by one
 ifneq ($(filter install,$(MAKECMDGOALS)),)
         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
-	        mixed-targets := 1
+		mixed-build := 1
         endif
 endif
 
-ifeq ($(mixed-targets),1)
+ifdef mixed-build
 # ===========================================================================
 # We're called with mixed targets (*config and build targets).
 # Handle them one by one.
@@ -332,7 +344,7 @@ __build_one_by_one:
 		$(MAKE) -f $(srctree)/Makefile $$i; \
 	done
 
-else
+else # !mixed-build
 
 include scripts/Kbuild.include
 
@@ -392,9 +404,7 @@ KCONFIG_CONFIG	?= .config
 export KCONFIG_CONFIG
 
 # SHELL used by kbuild
-CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
+CONFIG_SHELL := sh
-	  else if [ -x /bin/bash ]; then echo /bin/bash; \
-	  else echo sh; fi ; fi)
 
 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
@@ -431,6 +441,7 @@ PYTHON		= python
 PYTHON2		= python2
 PYTHON3		= python3
 CHECK		= sparse
+BASH		= bash
 
 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
@@ -470,12 +481,13 @@ KBUILD_AFLAGS_KERNEL :=
 KBUILD_CFLAGS_KERNEL :=
 KBUILD_AFLAGS_MODULE  := -DMODULE
 KBUILD_CFLAGS_MODULE  := -DMODULE
-KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
+KBUILD_LDFLAGS_MODULE :=
+export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
 KBUILD_LDFLAGS :=
 GCC_PLUGINS_CFLAGS :=
 CLANG_FLAGS :=
 
-export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
+export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL
 export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
@@ -506,6 +518,7 @@ scripts_basic:
 	$(Q)rm -f .tmp_quiet_recordmcount
 
 PHONY += outputmakefile
+# Before starting out-of-tree build, make sure the source tree is clean.
 # outputmakefile generates a Makefile in the output directory, if using a
 # separate output directory. This allows convenient use of make in the
 # output directory.
@@ -513,6 +526,15 @@ PHONY += outputmakefile
 # ignore whole output directory
 outputmakefile:
 ifdef building_out_of_srctree
+	$(Q)if [ -f $(srctree)/.config -o \
+		 -d $(srctree)/include/config -o \
+		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
+		echo >&2 "***"; \
+		echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
+		echo >&2 "*** in $(abs_srctree)";\
+		echo >&2 "***"; \
+		false; \
+	fi
 	$(Q)ln -fsn $(srctree) source
 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 	$(Q)test -e .gitignore || \
@@ -544,7 +566,7 @@ endif
 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
 
-ifeq ($(config-targets),1)
+ifdef config-build
 # ===========================================================================
 # *config targets only - make sure prerequisites are updated, and descend
 # in scripts/kconfig to make the *config target
@@ -555,13 +577,13 @@ ifeq ($(config-targets),1)
 include arch/$(SRCARCH)/Makefile
 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 
-config: scripts_basic outputmakefile FORCE
+config: outputmakefile scripts_basic FORCE
 	$(Q)$(MAKE) $(build)=scripts/kconfig $@
 
-%config: scripts_basic outputmakefile FORCE
+%config: outputmakefile scripts_basic FORCE
 	$(Q)$(MAKE) $(build)=scripts/kconfig $@
 
-else
+else #!config-build
 # ===========================================================================
 # Build targets only - this includes vmlinux, arch specific targets, clean
 # targets and others. In general all targets except *config targets.
@@ -604,7 +626,7 @@ endif
 
 export KBUILD_MODULES KBUILD_BUILTIN
 
-ifeq ($(dot-config),1)
+ifdef need-config
 include include/config/auto.conf
 endif
 
@@ -645,15 +667,10 @@ RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc
 export RETPOLINE_CFLAGS
 export RETPOLINE_VDSO_CFLAGS
 
-# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
-# values of the respective KBUILD_* variables
-ARCH_CPPFLAGS :=
-ARCH_AFLAGS :=
-ARCH_CFLAGS :=
 include arch/$(SRCARCH)/Makefile
 
-ifeq ($(dot-config),1)
+ifdef need-config
-ifeq ($(may-sync-config),1)
+ifdef may-sync-config
 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 # because some architectures define CROSS_COMPILE there.
@@ -676,7 +693,7 @@ $(KCONFIG_CONFIG):
 # The syncconfig should be executed only once to make all the targets.
 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
-else
+else # !may-sync-config
 # External modules and some install targets need include/generated/autoconf.h
 # and include/config/auto.conf but do not care if they are up-to-date.
 # Use auto.conf to trigger the test
@@ -692,7 +709,7 @@ include/config/auto.conf:
 	/bin/false)
 
 endif # may-sync-config
-endif # $(dot-config)
+endif # need-config
 
 KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
 KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
@@ -700,10 +717,12 @@ KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
 KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
 KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
 
-ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
+ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
-KBUILD_CFLAGS	+= -Os
-else
 KBUILD_CFLAGS += -O2
+else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
+KBUILD_CFLAGS += -O3
+else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
+KBUILD_CFLAGS += -Os
 endif
 
 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
@@ -751,6 +770,11 @@ else
 # These warnings generated too much noise in a regular build.
 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 KBUILD_CFLAGS += -Wno-unused-but-set-variable
+
+# Warn about unmarked fall-throughs in switch statement.
+# Disabled for clang while comment to attribute conversion happens and
+# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
+KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
 endif
 
 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
@@ -845,9 +869,6 @@ NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 # warn about C99 declaration after statement
 KBUILD_CFLAGS += -Wdeclaration-after-statement
 
-# Warn about unmarked fall-throughs in switch statement.
-KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
-
 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 KBUILD_CFLAGS += -Wvla
 
@@ -900,11 +921,10 @@ include scripts/Makefile.kasan
 include scripts/Makefile.extrawarn
 include scripts/Makefile.ubsan
 
-# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
+# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
-# last assignments
+KBUILD_CPPFLAGS += $(KCPPFLAGS)
-KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
+KBUILD_AFLAGS   += $(KAFLAGS)
-KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
+KBUILD_CFLAGS   += $(KCFLAGS)
-KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 
 KBUILD_LDFLAGS_MODULE += --build-id
 LDFLAGS_vmlinux += --build-id
@@ -1007,7 +1027,7 @@ endif
 
 PHONY += prepare0
 
-export MODORDER := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)modules.order
+export MODORDER := $(extmod-prefix)modules.order
 
 ifeq ($(KBUILD_EXTMOD),)
 core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
@@ -1020,6 +1040,9 @@ vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
 		     $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
 			$(drivers-) $(net-) $(libs-) $(virt-))))
 
+build-dirs	:= $(vmlinux-dirs)
+clean-dirs	:= $(vmlinux-alldirs)
+
 init-y		:= $(patsubst %/, %/built-in.a, $(init-y))
 core-y		:= $(patsubst %/, %/built-in.a, $(core-y))
 drivers-y	:= $(patsubst %/, %/built-in.a, $(drivers-y))
@@ -1042,7 +1065,7 @@ vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
 # Recurse until adjust_autoksyms.sh is satisfied
 PHONY += autoksyms_recursive
 ifdef CONFIG_TRIM_UNUSED_KSYMS
-autoksyms_recursive: $(vmlinux-deps) modules.order
+autoksyms_recursive: descend modules.order
 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
 endif
@@ -1074,17 +1097,7 @@ targets := vmlinux
 
 # The actual objects are generated when descending,
 # make sure no implicit rule kicks in
-$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
+$(sort $(vmlinux-deps)): descend ;
-
-# Handle descending into subdirectories listed in $(vmlinux-dirs)
-# Preset locale variables to speed up the build process. Limit locale
-# tweaks to this spot to avoid wrong language settings when running
-# make menuconfig etc.
-# Error messages still appears in the original language
-
-PHONY += $(vmlinux-dirs)
-$(vmlinux-dirs): prepare
-	$(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1
 
 filechk_kernel.release = \
 	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
@@ -1106,24 +1119,9 @@ scripts: scripts_basic scripts_dtc
 # archprepare is used in arch Makefiles and when processed asm symlink,
 # version.h and scripts_basic is processed / created.
 
-PHONY += prepare archprepare prepare3
+PHONY += prepare archprepare
 
-# prepare3 is used to check if we are building in a separate output directory,
+archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
-# and if so do:
-# 1) Check that make has not been executed in the kernel src $(srctree)
-prepare3: include/config/kernel.release
-ifdef building_out_of_srctree
-	@$(kecho) '  Using $(srctree) as source for kernel'
-	$(Q)if [ -f $(srctree)/.config -o \
-		 -d $(srctree)/include/config -o \
-		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
-		echo >&2 "  $(srctree) is not clean, please run 'make ARCH=$(ARCH) mrproper'"; \
-		echo >&2 "  in the '$(srctree)' directory.";\
-		/bin/false; \
-	fi;
-endif
-
-archprepare: archheaders archscripts scripts prepare3 outputmakefile \
 	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
 
 prepare0: archprepare
@@ -1248,7 +1246,7 @@ kselftest-merge:
 	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
 	$(Q)find $(srctree)/tools/testing/selftests -name config | \
 		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
-	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
+	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
 
 # ---------------------------------------------------------------------------
 # Devicetree files
@@ -1259,11 +1257,11 @@ endif
 
 ifneq ($(dtstree),)
 
-%.dtb: prepare3 scripts_dtc
+%.dtb: include/config/kernel.release scripts_dtc
 	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
 
 PHONY += dtbs dtbs_install dt_binding_check
-dtbs dtbs_check: prepare3 scripts_dtc
+dtbs dtbs_check: include/config/kernel.release scripts_dtc
 	$(Q)$(MAKE) $(build)=$(dtstree)
 
 dtbs_check: export CHECK_DTBS=1
@@ -1302,17 +1300,16 @@ all: modules
 
 PHONY += modules
 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
-	@$(kecho) '  Building modules, stage 2.';
 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
 
-modules.order: $(vmlinux-dirs)
+modules.order: descend
-	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
+	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
 
-modbuiltin-dirs := $(addprefix _modbuiltin_, $(vmlinux-dirs))
+modbuiltin-dirs := $(addprefix _modbuiltin_, $(build-dirs))
 
 modules.builtin: $(modbuiltin-dirs)
-	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
+	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
 
 PHONY += $(modbuiltin-dirs)
 # tristate.conf is not included from this Makefile. Add it as a prerequisite
@@ -1385,12 +1382,14 @@ CLEAN_FILES += modules.builtin.modinfo
 
 # Directories & files removed with 'make mrproper'
 MRPROPER_DIRS  += include/config include/generated          \
-		  arch/$(SRCARCH)/include/generated .tmp_objdiff
+		  arch/$(SRCARCH)/include/generated .tmp_objdiff \
+		  debian/ snap/ tar-install/
 MRPROPER_FILES += .config .config.old .version \
 		  Module.symvers \
 		  signing_key.pem signing_key.priv signing_key.x509	\
 		  x509.genkey extra_certificates signing_key.x509.keyid	\
-		  signing_key.x509.signer vmlinux-gdb.py
+		  signing_key.x509.signer vmlinux-gdb.py \
+		  *.spec
 
 # Directories & files removed with 'make distclean'
 DISTCLEAN_DIRS  +=
@@ -1400,11 +1399,8 @@ DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
 #
 clean: rm-dirs  := $(CLEAN_DIRS)
 clean: rm-files := $(CLEAN_FILES)
-clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs))
 
-PHONY += $(clean-dirs) clean archclean vmlinuxclean
+PHONY += archclean vmlinuxclean
-$(clean-dirs):
-	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 
 vmlinuxclean:
 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
@@ -1445,13 +1441,11 @@ distclean: mrproper
 
 # Packaging of the kernel to various formats
 # ---------------------------------------------------------------------------
-package-dir	:= scripts/package
 
 %src-pkg: FORCE
-	$(Q)$(MAKE) $(build)=$(package-dir) $@
+	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
 %pkg: include/config/kernel.release FORCE
-	$(Q)$(MAKE) $(build)=$(package-dir) $@
+	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
-
 
 # Brief documentation of the typical targets used
 # ---------------------------------------------------------------------------
@@ -1525,7 +1519,7 @@ help:
 	@echo '  or  "cd tools; make help"'
 	@echo  ''
 	@echo  'Kernel packaging:'
-	@$(MAKE) $(build)=$(package-dir) help
+	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
 	@echo  ''
 	@echo  'Documentation targets:'
 	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
@@ -1550,7 +1544,7 @@ help:
 	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
 	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
 	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
-	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
+	@echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
 	@echo  '		1: warnings which may be relevant and do not occur too often'
 	@echo  '		2: warnings which occur quite often but may still be relevant'
 	@echo  '		3: more obscure warnings, can most likely be ignored'
@@ -1579,7 +1573,7 @@ $(help-board-dirs): help-%:
 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
 	       linkcheckdocs dochelp refcheckdocs
 PHONY += $(DOC_TARGETS)
-$(DOC_TARGETS): scripts_basic FORCE
+$(DOC_TARGETS):
 	$(Q)$(MAKE) $(build)=Documentation $@
 
 # Misc
@@ -1624,13 +1618,9 @@ $(objtree)/Module.symvers:
 	echo "           is missing; modules will have no dependencies and modversions."; \
 	echo )
 
-module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
+build-dirs := $(KBUILD_EXTMOD)
-PHONY += $(module-dirs) modules
+PHONY += modules
-$(module-dirs): prepare $(objtree)/Module.symvers
+modules: descend $(objtree)/Module.symvers
-	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) need-modorder=1
-
-modules: $(module-dirs)
-	@$(kecho) '  Building modules, stage 2.';
 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 
 PHONY += modules_install
@@ -1646,14 +1636,13 @@ PHONY += _emodinst_post
 _emodinst_post: _emodinst_
 	$(call cmd,depmod)
 
-clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
+clean-dirs := $(KBUILD_EXTMOD)
-
-PHONY += $(clean-dirs) clean
-$(clean-dirs):
-	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
-
 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
 
+PHONY += /
+/:
+	@echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'
+
 PHONY += help
 help:
 	@echo  '  Building external modules.'
@@ -1667,6 +1656,21 @@ help:
 PHONY += prepare
 endif # KBUILD_EXTMOD
 
+# Handle descending into subdirectories listed in $(build-dirs)
+# Preset locale variables to speed up the build process. Limit locale
+# tweaks to this spot to avoid wrong language settings when running
+# make menuconfig etc.
+# Error messages still appears in the original language
+PHONY += descend $(build-dirs)
+descend: $(build-dirs)
+$(build-dirs): prepare
+	$(Q)$(MAKE) $(build)=$@ single-build=$(single-build) need-builtin=1 need-modorder=1
+
+clean-dirs := $(addprefix _clean_, $(clean-dirs))
+PHONY += $(clean-dirs) clean
+$(clean-dirs):
+	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
+
 clean: $(clean-dirs)
 	$(call cmd,rmdirs)
 	$(call cmd,rmfiles)
@@ -1688,7 +1692,7 @@ clean: $(clean-dirs)
 # Generate tags for editors
 # ---------------------------------------------------------------------------
 quiet_cmd_tags = GEN     $@
-      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
+      cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
 
 tags TAGS cscope gtags: FORCE
 	$(call cmd,tags)
@@ -1709,7 +1713,7 @@ versioncheck:
 		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
 
 coccicheck:
-	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
+	$(Q)$(BASH) $(srctree)/scripts/$@
 
 namespacecheck:
 	$(PERL) $(srctree)/scripts/namespace.pl
@@ -1757,45 +1761,47 @@ tools/%: FORCE
 
 # Single targets
 # ---------------------------------------------------------------------------
-# Single targets are compatible with:
+# To build individual files in subdirectories, you can do like this:
-# - build with mixed source and output
-# - build with separate output dir 'make O=...'
-# - external modules
 #
-#  target-dir => where to store outputfile
+#   make foo/bar/baz.s
-#  build-dir  => directory in kernel source tree to use
+#
+# The supported suffixes for single-target are listed in 'single-targets'
+#
+# To build only under specific subdirectories, you can do like this:
+#
+#   make foo/bar/baz/
 
-build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@
+ifdef single-build
-build-dir = $(patsubst %/,%,$(dir $(build-target)))
+
+single-all := $(filter $(single-targets), $(MAKECMDGOALS))
+
+# .ko is special because modpost is needed
+single-ko := $(sort $(filter %.ko, $(single-all)))
+single-no-ko := $(sort $(patsubst %.ko,%.mod, $(single-all)))
+
+$(single-ko): single_modpost
+	@:
+$(single-no-ko): descend
+	@:
 
-%.i: prepare FORCE
-	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
-%.ll: prepare FORCE
-	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
-%.lst: prepare FORCE
-	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
-%.o: prepare FORCE
-	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
-%.s: prepare FORCE
-	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
-%.symtypes: prepare FORCE
-	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
 ifeq ($(KBUILD_EXTMOD),)
-# For the single build of an in-tree module, use a temporary file to avoid
+# For the single build of in-tree modules, use a temporary file to avoid
 # the situation of modules_install installing an invalid modules.order.
-%.ko: MODORDER := .modules.tmp
+MODORDER := .modules.tmp
 endif
-%.ko: prepare FORCE
+
-	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target:.ko=.mod)
+PHONY += single_modpost
-	$(Q)echo $(build-target) > $(MODORDER)
+single_modpost: $(single-no-ko)
+	$(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 
-# Modules
+KBUILD_MODULES := 1
-PHONY += /
-/: ./
 
-%/: prepare FORCE
+export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
-	$(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir) need-modorder=1
+
+single-build = $(if $(filter-out $@/, $(single-no-ko)),1)
+
+endif
 
 # FIXME Should go into a make.lib or something
 # ===========================================================================
@@ -1816,8 +1822,8 @@ existing-targets := $(wildcard $(sort $(targets)))
 
 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
 
-endif   # ifeq ($(config-targets),1)
+endif # config-targets
-endif   # ifeq ($(mixed-targets),1)
+endif # mixed-build
 endif # need-sub-make
 
 PHONY += FORCE

arch/Kconfig

@@ -292,6 +292,13 @@ config ARCH_32BIT_OFF_T
 	  still support 32-bit off_t. This option is enabled for all such
 	  architectures explicitly.
 
+config HAVE_ASM_MODVERSIONS
+	bool
+	help
+	  This symbol should be selected by an architecure if it provides
+	  <asm/asm-prototypes.h> to support the module versioning for symbols
+	  exported from assembly code.
+
 config HAVE_REGS_AND_STACK_ACCESS_API
 	bool
 	help

arch/alpha/Kconfig

@@ -11,6 +11,7 @@ config ALPHA
 	select PCI_DOMAINS if PCI
 	select PCI_SYSCALL if PCI
 	select HAVE_AOUT
+	select HAVE_ASM_MODVERSIONS
 	select HAVE_IDE
 	select HAVE_OPROFILE
 	select HAVE_PCSPKR_PLATFORM

arch/arc/Makefile

@@ -48,14 +48,6 @@ endif
 cfi := $(call as-instr,.cfi_startproc\n.cfi_endproc,-DARC_DW2_UNWIND_AS_CFI)
 cflags-$(CONFIG_ARC_DW2_UNWIND)		+= -fasynchronous-unwind-tables $(cfi)
 
-ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
-# Generic build system uses -O2, we want -O3
-# Note: No need to add to cflags-y as that happens anyways
-#
-# Disable the false maybe-uninitialized warings gcc spits out at -O3
-ARCH_CFLAGS += -O3 $(call cc-disable-warning,maybe-uninitialized,)
-endif
-
 # small data is default for elf32 tool-chain. If not usable, disable it
 # This also allows repurposing GP as scratch reg to gcc reg allocator
 disable_small_data := y

arch/arc/configs/axs101_defconfig

@@ -9,6 +9,7 @@ CONFIG_NAMESPACES=y
 # CONFIG_UTS_NS is not set
 # CONFIG_PID_NS is not set
 CONFIG_BLK_DEV_INITRD=y
+CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y
 CONFIG_EMBEDDED=y
 CONFIG_PERF_EVENTS=y
 # CONFIG_VM_EVENT_COUNTERS is not set

arch/arc/configs/axs103_defconfig

@@ -9,6 +9,7 @@ CONFIG_NAMESPACES=y
 # CONFIG_UTS_NS is not set
 # CONFIG_PID_NS is not set
 CONFIG_BLK_DEV_INITRD=y
+CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y
 CONFIG_EMBEDDED=y
 CONFIG_PERF_EVENTS=y
 # CONFIG_VM_EVENT_COUNTERS is not set

arch/arc/configs/axs103_smp_defconfig

@@ -9,6 +9,7 @@ CONFIG_NAMESPACES=y
 # CONFIG_UTS_NS is not set
 # CONFIG_PID_NS is not set
 CONFIG_BLK_DEV_INITRD=y
+CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y
 CONFIG_EMBEDDED=y
 CONFIG_PERF_EVENTS=y
 # CONFIG_VM_EVENT_COUNTERS is not set

arch/arc/configs/haps_hs_defconfig

@@ -10,6 +10,7 @@ CONFIG_NAMESPACES=y
 # CONFIG_UTS_NS is not set
 # CONFIG_PID_NS is not set
 CONFIG_BLK_DEV_INITRD=y
+CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y
 CONFIG_EXPERT=y
 CONFIG_PERF_EVENTS=y
 # CONFIG_COMPAT_BRK is not set

arch/arc/configs/haps_hs_smp_defconfig

@@ -10,6 +10,7 @@ CONFIG_NAMESPACES=y
 # CONFIG_UTS_NS is not set
 # CONFIG_PID_NS is not set
 CONFIG_BLK_DEV_INITRD=y
+CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y
 CONFIG_EMBEDDED=y
 CONFIG_PERF_EVENTS=y
 # CONFIG_VM_EVENT_COUNTERS is not set

arch/arc/configs/hsdk_defconfig

@@ -9,6 +9,7 @@ CONFIG_NAMESPACES=y
 # CONFIG_PID_NS is not set
 CONFIG_BLK_DEV_INITRD=y
 CONFIG_BLK_DEV_RAM=y
+CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y
 CONFIG_EMBEDDED=y
 CONFIG_PERF_EVENTS=y
 # CONFIG_VM_EVENT_COUNTERS is not set

arch/arc/configs/nps_defconfig

@@ -6,6 +6,7 @@ CONFIG_HIGH_RES_TIMERS=y
 CONFIG_IKCONFIG=y
 CONFIG_IKCONFIG_PROC=y
 CONFIG_BLK_DEV_INITRD=y
+CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y
 CONFIG_SYSCTL_SYSCALL=y
 # CONFIG_EPOLL is not set
 # CONFIG_SIGNALFD is not set

arch/arc/configs/nsim_700_defconfig

@@ -10,6 +10,7 @@ CONFIG_NAMESPACES=y
 # CONFIG_UTS_NS is not set
 # CONFIG_PID_NS is not set
 CONFIG_BLK_DEV_INITRD=y
+CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y
 CONFIG_KALLSYMS_ALL=y
 CONFIG_EMBEDDED=y
 CONFIG_PERF_EVENTS=y

arch/arc/configs/nsim_hs_defconfig

@@ -10,6 +10,7 @@ CONFIG_NAMESPACES=y
 # CONFIG_UTS_NS is not set
 # CONFIG_PID_NS is not set
 CONFIG_BLK_DEV_INITRD=y
+CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y
 CONFIG_KALLSYMS_ALL=y
 CONFIG_EMBEDDED=y
 CONFIG_PERF_EVENTS=y

arch/arc/configs/nsim_hs_smp_defconfig

@@ -8,6 +8,7 @@ CONFIG_NAMESPACES=y
 # CONFIG_UTS_NS is not set
 # CONFIG_PID_NS is not set
 CONFIG_BLK_DEV_INITRD=y
+CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y
 CONFIG_KALLSYMS_ALL=y
 CONFIG_EMBEDDED=y
 CONFIG_PERF_EVENTS=y

arch/arc/configs/nsimosci_defconfig

@@ -10,6 +10,7 @@ CONFIG_NAMESPACES=y
 # CONFIG_UTS_NS is not set
 # CONFIG_PID_NS is not set
 CONFIG_BLK_DEV_INITRD=y
+CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y
 CONFIG_KALLSYMS_ALL=y
 CONFIG_EMBEDDED=y
 CONFIG_PERF_EVENTS=y

arch/arc/configs/nsimosci_hs_defconfig

@@ -10,6 +10,7 @@ CONFIG_NAMESPACES=y
 # CONFIG_UTS_NS is not set
 # CONFIG_PID_NS is not set
 CONFIG_BLK_DEV_INITRD=y
+CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y
 CONFIG_KALLSYMS_ALL=y
 CONFIG_EMBEDDED=y
 CONFIG_PERF_EVENTS=y

arch/arc/configs/nsimosci_hs_smp_defconfig

@@ -8,6 +8,7 @@ CONFIG_IKCONFIG_PROC=y
 # CONFIG_UTS_NS is not set
 # CONFIG_PID_NS is not set
 CONFIG_BLK_DEV_INITRD=y
+CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y
 CONFIG_PERF_EVENTS=y
 # CONFIG_COMPAT_BRK is not set
 CONFIG_KPROBES=y

arch/arc/configs/tb10x_defconfig

@@ -14,6 +14,7 @@ CONFIG_INITRAMFS_SOURCE="../tb10x-rootfs.cpio"
 CONFIG_INITRAMFS_ROOT_UID=2100
 CONFIG_INITRAMFS_ROOT_GID=501
 # CONFIG_RD_GZIP is not set
+CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y
 CONFIG_SYSCTL_SYSCALL=y
 CONFIG_KALLSYMS_ALL=y
 # CONFIG_AIO is not set

arch/arc/configs/vdk_hs38_defconfig

@@ -4,6 +4,7 @@ CONFIG_HIGH_RES_TIMERS=y
 CONFIG_IKCONFIG=y
 CONFIG_IKCONFIG_PROC=y
 CONFIG_BLK_DEV_INITRD=y
+CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y
 CONFIG_EMBEDDED=y
 CONFIG_PERF_EVENTS=y
 # CONFIG_VM_EVENT_COUNTERS is not set

arch/arc/configs/vdk_hs38_smp_defconfig

@@ -4,6 +4,7 @@ CONFIG_HIGH_RES_TIMERS=y
 CONFIG_IKCONFIG=y
 CONFIG_IKCONFIG_PROC=y
 CONFIG_BLK_DEV_INITRD=y
+CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y
 CONFIG_EMBEDDED=y
 CONFIG_PERF_EVENTS=y
 # CONFIG_VM_EVENT_COUNTERS is not set

arch/arm/Makefile

@@ -17,7 +17,7 @@ KBUILD_LDFLAGS_MODULE	+= --be8
 endif
 
 ifeq ($(CONFIG_ARM_MODULE_PLTS),y)
-KBUILD_LDFLAGS_MODULE	+= -T $(srctree)/arch/arm/kernel/module.lds
+KBUILD_LDS_MODULE	+= $(srctree)/arch/arm/kernel/module.lds
 endif
 
 GZFLAGS		:=-9

arch/arm/kvm/Makefile

@@ -8,13 +8,14 @@ ifeq ($(plus_virt),+virt)
 	plus_virt_def := -DREQUIRES_VIRT=1
 endif
 
+KVM := ../../../virt/kvm
+
 ccflags-y += -I $(srctree)/$(src) -I $(srctree)/virt/kvm/arm/vgic
-CFLAGS_arm.o := $(plus_virt_def)
+CFLAGS_$(KVM)/arm/arm.o := $(plus_virt_def)
 
 AFLAGS_init.o := -Wa,-march=armv7-a$(plus_virt)
 AFLAGS_interrupts.o := -Wa,-march=armv7-a$(plus_virt)
 
-KVM := ../../../virt/kvm
 kvm-arm-y = $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o $(KVM)/vfio.o
 
 obj-$(CONFIG_KVM_ARM_HOST) += hyp/

arch/arm64/Kconfig

@@ -134,6 +134,7 @@ config ARM64
 	select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 	select HAVE_ARCH_VMAP_STACK
 	select HAVE_ARM_SMCCC
+	select HAVE_ASM_MODVERSIONS
 	select HAVE_EBPF_JIT
 	select HAVE_C_RECORDMCOUNT
 	select HAVE_CMPXCHG_DOUBLE

arch/arm64/Makefile

@@ -108,7 +108,7 @@ endif
 CHECKFLAGS	+= -D__aarch64__
 
 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
-KBUILD_LDFLAGS_MODULE	+= -T $(srctree)/arch/arm64/kernel/module.lds
+KBUILD_LDS_MODULE	+= $(srctree)/arch/arm64/kernel/module.lds
 endif
 
 # Default value

arch/ia64/Kconfig

@@ -19,6 +19,7 @@ config IA64
 	select PCI_DOMAINS if PCI
 	select PCI_MSI
 	select PCI_SYSCALL if PCI
+	select HAVE_ASM_MODVERSIONS
 	select HAVE_UNSTABLE_SCHED_CLOCK
 	select HAVE_EXIT_THREAD
 	select HAVE_IDE

arch/ia64/Makefile

@@ -20,7 +20,7 @@ CHECKFLAGS	+= -D__ia64=1 -D__ia64__=1 -D_LP64 -D__LP64__
 
 OBJCOPYFLAGS	:= --strip-all
 LDFLAGS_vmlinux	:= -static
-KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/ia64/module.lds
+KBUILD_LDS_MODULE += $(srctree)/arch/ia64/module.lds
 KBUILD_AFLAGS_KERNEL := -mconstant-gp
 EXTRA		:=
 

arch/m68k/Kconfig

@@ -12,6 +12,7 @@ config M68K
 	select DMA_DIRECT_REMAP if HAS_DMA && MMU && !COLDFIRE
 	select HAVE_IDE
 	select HAVE_AOUT if MMU
+	select HAVE_ASM_MODVERSIONS
 	select HAVE_DEBUG_BUGVERBOSE
 	select GENERIC_IRQ_SHOW
 	select GENERIC_ATOMIC64

arch/m68k/Makefile

@@ -73,7 +73,7 @@ KBUILD_AFLAGS += -D__uClinux__
 endif
 
 KBUILD_LDFLAGS := -m m68kelf
-KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/m68k/kernel/module.lds
+KBUILD_LDS_MODULE += $(srctree)/arch/m68k/kernel/module.lds
 
 ifdef CONFIG_SUN3
 LDFLAGS_vmlinux = -N

arch/mips/Kconfig

@@ -44,6 +44,7 @@ config MIPS
 	select HAVE_ARCH_SECCOMP_FILTER
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_ARCH_TRANSPARENT_HUGEPAGE if CPU_SUPPORTS_HUGEPAGES && 64BIT
+	select HAVE_ASM_MODVERSIONS
 	select HAVE_EBPF_JIT if (!CPU_MICROMIPS)
 	select HAVE_CONTEXT_TRACKING
 	select HAVE_COPY_THREAD_TLS

arch/mips/boot/Makefile

@@ -160,7 +160,7 @@ targets += vmlinux.lzo.itb
 quiet_cmd_itb-image = ITB     $@
       cmd_itb-image = \
 		env PATH="$(objtree)/scripts/dtc:$(PATH)" \
-		$(CONFIG_SHELL) $(MKIMAGE) \
+		$(BASH) $(MKIMAGE) \
 		-D "-I dts -O dtb -p 500 \
 			--include $(objtree)/arch/mips \
 			--warning no-unit_address_vs_reg" \

arch/parisc/Makefile

@@ -60,7 +60,7 @@ KBUILD_CFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY=1 \
 		 -DFTRACE_PATCHABLE_FUNCTION_SIZE=$(NOP_COUNT)
 
 CC_FLAGS_FTRACE := -fpatchable-function-entry=$(NOP_COUNT),$(shell echo $$(($(NOP_COUNT)-1)))
-KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/parisc/kernel/module.lds
+KBUILD_LDS_MODULE += $(srctree)/arch/parisc/kernel/module.lds
 endif
 
 OBJCOPY_FLAGS =-O binary -R .note -R .comment -S

arch/powerpc/Kconfig

@@ -177,6 +177,7 @@ config PPC
 	select HAVE_ARCH_NVRAM_OPS
 	select HAVE_ARCH_SECCOMP_FILTER
 	select HAVE_ARCH_TRACEHOOK
+	select HAVE_ASM_MODVERSIONS
 	select HAVE_C_RECORDMCOUNT
 	select HAVE_CBPF_JIT			if !PPC64
 	select HAVE_STACKPROTECTOR		if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)

arch/powerpc/Makefile

@@ -65,7 +65,7 @@ UTS_MACHINE := $(subst $(space),,$(machine-y))
 ifdef CONFIG_PPC32
 KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
 else
-KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/powerpc/kernel/module.lds
+KBUILD_LDS_MODULE += $(srctree)/arch/powerpc/kernel/module.lds
 ifeq ($(call ld-ifversion, -ge, 225000000, y),y)
 # Have the linker provide sfpr if possible.
 # There is a corresponding test in arch/powerpc/lib/Makefile

arch/powerpc/Makefile.postlink

@@ -18,7 +18,7 @@ quiet_cmd_relocs_check = CHKREL  $@
 ifdef CONFIG_PPC_BOOK3S_64
       cmd_relocs_check =						\
 	$(CONFIG_SHELL) $(srctree)/arch/powerpc/tools/relocs_check.sh "$(OBJDUMP)" "$@" ; \
-	$(CONFIG_SHELL) $(srctree)/arch/powerpc/tools/unrel_branch_check.sh "$(OBJDUMP)" "$@"
+	$(BASH) $(srctree)/arch/powerpc/tools/unrel_branch_check.sh "$(OBJDUMP)" "$@"
 else
       cmd_relocs_check =						\
 	$(CONFIG_SHELL) $(srctree)/arch/powerpc/tools/relocs_check.sh "$(OBJDUMP)" "$@"

arch/powerpc/kernel/prom_init_check.sh

@@ -33,7 +33,7 @@ OBJ="$2"
 
 ERROR=0
 
-function check_section()
+check_section()
 {
     file=$1
     section=$2

arch/riscv/Kconfig

@@ -31,6 +31,7 @@ config RISCV
 	select GENERIC_SMP_IDLE_THREAD
 	select GENERIC_ATOMIC64 if !64BIT
 	select HAVE_ARCH_AUDITSYSCALL
+	select HAVE_ASM_MODVERSIONS
 	select HAVE_MEMBLOCK_NODE_MAP
 	select HAVE_DMA_CONTIGUOUS
 	select HAVE_FUTEX_CMPXCHG if FUTEX

arch/riscv/Makefile

@@ -52,7 +52,7 @@ ifeq ($(CONFIG_CMODEL_MEDANY),y)
 	KBUILD_CFLAGS += -mcmodel=medany
 endif
 ifeq ($(CONFIG_MODULE_SECTIONS),y)
-	KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/riscv/kernel/module.lds
+	KBUILD_LDS_MODULE += $(srctree)/arch/riscv/kernel/module.lds
 endif
 ifeq ($(CONFIG_PERF_EVENTS),y)
         KBUILD_CFLAGS += -fno-omit-frame-pointer

arch/s390/Kconfig

@@ -132,6 +132,7 @@ config S390
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 	select HAVE_ARCH_VMAP_STACK
+	select HAVE_ASM_MODVERSIONS
 	select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
 	select HAVE_CMPXCHG_DOUBLE
 	select HAVE_CMPXCHG_LOCAL

arch/sparc/Kconfig

@@ -17,6 +17,7 @@ config SPARC
 	select ARCH_MIGHT_HAVE_PC_SERIO
 	select OF
 	select OF_PROMTREE
+	select HAVE_ASM_MODVERSIONS
 	select HAVE_IDE
 	select HAVE_OPROFILE
 	select HAVE_ARCH_KGDB if !SMP || SPARC64

arch/um/Kconfig

@@ -9,6 +9,7 @@ config UML
 	select ARCH_NO_PREEMPT
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_ARCH_SECCOMP_FILTER
+	select HAVE_ASM_MODVERSIONS
 	select HAVE_UID16
 	select HAVE_FUTEX_CMPXCHG if FUTEX
 	select HAVE_DEBUG_KMEMLEAK

arch/x86/Kconfig

@@ -147,6 +147,7 @@ config X86
 	select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD if X86_64
 	select HAVE_ARCH_VMAP_STACK		if X86_64
 	select HAVE_ARCH_WITHIN_STACK_FRAMES
+	select HAVE_ASM_MODVERSIONS
 	select HAVE_CMPXCHG_DOUBLE
 	select HAVE_CMPXCHG_LOCAL
 	select HAVE_CONTEXT_TRACKING		if X86_64

arch/x86/entry/vdso/Makefile

@@ -89,6 +89,7 @@ $(vobjs): KBUILD_CFLAGS := $(filter-out $(GCC_PLUGINS_CFLAGS) $(RETPOLINE_CFLAGS
 #
 CFLAGS_REMOVE_vdso-note.o = -pg
 CFLAGS_REMOVE_vclock_gettime.o = -pg
+CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg
 CFLAGS_REMOVE_vgetcpu.o = -pg
 CFLAGS_REMOVE_vvar.o = -pg
 
@@ -128,7 +129,7 @@ $(obj)/%.so: $(obj)/%.so.dbg FORCE
 $(obj)/vdsox32.so.dbg: $(obj)/vdsox32.lds $(vobjx32s) FORCE
 	$(call if_changed,vdso_and_check)
 
-CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
+CPPFLAGS_vdso32/vdso32.lds = $(CPPFLAGS_vdso.lds)
 VDSO_LDFLAGS_vdso32.lds = -m elf_i386 -soname linux-gate.so.1
 
 targets += vdso32/vdso32.lds

drivers/gpu/drm/amd/display/dc/calcs/Makefile

@@ -36,9 +36,9 @@ ifdef CONFIG_CC_IS_CLANG
 calcs_ccflags += -msse2
 endif
 
-CFLAGS_dcn_calcs.o := $(calcs_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/calcs/dcn_calcs.o := $(calcs_ccflags)
-CFLAGS_dcn_calc_auto.o := $(calcs_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/calcs/dcn_calc_auto.o := $(calcs_ccflags)
-CFLAGS_dcn_calc_math.o := $(calcs_ccflags) -Wno-tautological-compare
+CFLAGS_$(AMDDALPATH)/dc/calcs/dcn_calc_math.o := $(calcs_ccflags) -Wno-tautological-compare
 
 BW_CALCS = dce_calcs.o bw_fixed.o custom_float.o
 

drivers/gpu/drm/amd/display/dc/dcn20/Makefile

@@ -16,10 +16,10 @@ else ifneq ($(call cc-option, -mstack-alignment=16),)
 	cc_stack_align := -mstack-alignment=16
 endif
 
-CFLAGS_dcn20_resource.o := -mhard-float -msse $(cc_stack_align)
+CFLAGS_$(AMDDALPATH)/dc/dcn20/dcn20_resource.o := -mhard-float -msse $(cc_stack_align)
 
 ifdef CONFIG_CC_IS_CLANG
-CFLAGS_dcn20_resource.o += -msse2
+CFLAGS_$(AMDDALPATH)/dc/dcn20/dcn20_resource.o += -msse2
 endif
 
 AMD_DAL_DCN20 = $(addprefix $(AMDDALPATH)/dc/dcn20/,$(DCN20))

drivers/gpu/drm/amd/display/dc/dcn21/Makefile

@@ -3,7 +3,7 @@
 
 DCN21 = dcn21_hubp.o dcn21_hubbub.o dcn21_resource.o
 
-CFLAGS_dcn21_resource.o := -mhard-float -msse -mpreferred-stack-boundary=4
+CFLAGS_$(AMDDALPATH)/dc/dcn21/dcn21_resource.o := -mhard-float -msse -mpreferred-stack-boundary=4
 
 AMD_DAL_DCN21 = $(addprefix $(AMDDALPATH)/dc/dcn21/,$(DCN21))
 

drivers/gpu/drm/amd/display/dc/dml/Makefile

@@ -36,25 +36,22 @@ ifdef CONFIG_CC_IS_CLANG
 dml_ccflags += -msse2
 endif
 
-CFLAGS_display_mode_lib.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/display_mode_lib.o := $(dml_ccflags)
 
 ifdef CONFIG_DRM_AMD_DC_DCN2_0
-CFLAGS_display_mode_vba.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/display_mode_vba.o := $(dml_ccflags)
-CFLAGS_display_mode_vba_20.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/dcn20/display_mode_vba_20.o := $(dml_ccflags)
-CFLAGS_display_rq_dlg_calc_20.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/dcn20/display_rq_dlg_calc_20.o := $(dml_ccflags)
-CFLAGS_display_mode_vba_20v2.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/dcn20/display_mode_vba_20v2.o := $(dml_ccflags)
-CFLAGS_display_rq_dlg_calc_20v2.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/dcn20/display_rq_dlg_calc_20v2.o := $(dml_ccflags)
 endif
 ifdef CONFIG_DRM_AMD_DC_DCN2_1
-CFLAGS_display_mode_vba_21.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/dcn21/display_mode_vba_21.o := $(dml_ccflags)
-CFLAGS_display_rq_dlg_calc_21.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/dcn21/display_rq_dlg_calc_21.o := $(dml_ccflags)
 endif
-ifdef CONFIG_DRM_AMD_DCN3AG
+CFLAGS_$(AMDDALPATH)/dc/dml/dml1_display_rq_dlg_calc.o := $(dml_ccflags)
-CFLAGS_display_mode_vba_3ag.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/display_rq_dlg_helpers.o := $(dml_ccflags)
-endif
+CFLAGS_$(AMDDALPATH)/dc/dml/dml_common_defs.o := $(dml_ccflags)
-CFLAGS_dml1_display_rq_dlg_calc.o := $(dml_ccflags)
-CFLAGS_display_rq_dlg_helpers.o := $(dml_ccflags)
-CFLAGS_dml_common_defs.o := $(dml_ccflags)
 
 DML = display_mode_lib.o display_rq_dlg_helpers.o dml1_display_rq_dlg_calc.o \
 	dml_common_defs.o

drivers/gpu/drm/amd/display/dc/dsc/Makefile

@@ -13,10 +13,9 @@ ifdef CONFIG_CC_IS_CLANG
 dsc_ccflags += -msse2
 endif
 
-CFLAGS_rc_calc.o := $(dsc_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dsc/rc_calc.o := $(dsc_ccflags)
-CFLAGS_rc_calc_dpi.o := $(dsc_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dsc/rc_calc_dpi.o := $(dsc_ccflags)
-CFLAGS_codec_main_amd.o := $(dsc_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dsc/dc_dsc.o := $(dsc_ccflags)
-CFLAGS_dc_dsc.o := $(dsc_ccflags)
 
 DSC = dc_dsc.o rc_calc.o rc_calc_dpi.o
 

drivers/gpu/drm/i915/Makefile

@@ -26,7 +26,7 @@ subdir-ccflags-$(CONFIG_DRM_I915_WERROR) += -Werror
 
 # Fine grained warnings disable
 CFLAGS_i915_pci.o = $(call cc-disable-warning, override-init)
-CFLAGS_intel_fbdev.o = $(call cc-disable-warning, override-init)
+CFLAGS_display/intel_fbdev.o = $(call cc-disable-warning, override-init)
 
 subdir-ccflags-y += \
 	$(call as-instr,movntdqa (%eax)$(comma)%xmm0,-DCONFIG_AS_MOVNTDQA)

drivers/net/ethernet/aquantia/atlantic/hw_atl/Makefile

@@ -1,2 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-# kbuild requires Makefile in a directory to build individual objects

drivers/net/ethernet/mellanox/mlx5/core/accel/Makefile

@@ -1,2 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-subdir-ccflags-y += -I$(src)/..

drivers/net/ethernet/mellanox/mlx5/core/diag/Makefile

@@ -1,2 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-subdir-ccflags-y += -I$(src)/..

drivers/net/ethernet/mellanox/mlx5/core/en/Makefile

@@ -1,2 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-subdir-ccflags-y += -I$(src)/..

drivers/net/ethernet/mellanox/mlx5/core/en/xsk/Makefile

@@ -1 +0,0 @@
-subdir-ccflags-y += -I$(src)/../..

drivers/net/ethernet/mellanox/mlx5/core/en_accel/Makefile

@@ -1,2 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-subdir-ccflags-y += -I$(src)/..

drivers/net/ethernet/mellanox/mlx5/core/fpga/Makefile

@@ -1,2 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-subdir-ccflags-y += -I$(src)/..

drivers/net/ethernet/mellanox/mlx5/core/ipoib/Makefile

@@ -1,2 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-subdir-ccflags-y += -I$(src)/..

drivers/net/ethernet/mellanox/mlx5/core/lib/Makefile

@@ -1,2 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-subdir-ccflags-y += -I$(src)/..

drivers/net/ethernet/netronome/nfp/bpf/Makefile

@@ -1,2 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-# kbuild requires Makefile in a directory to build individual objects

drivers/net/ethernet/netronome/nfp/flower/Makefile

@@ -1,2 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-# kbuild requires Makefile in a directory to build individual objects

drivers/net/ethernet/netronome/nfp/nfpcore/Makefile

@@ -1,2 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-# kbuild requires Makefile in a directory to build individual objects

drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000/Makefile

@@ -1,2 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-# kbuild requires Makefile in a directory to build individual objects

drivers/net/ethernet/netronome/nfp/nic/Makefile

@@ -1,2 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-# kbuild requires Makefile in a directory to build individual objects

include/linux/compiler_types.h

@@ -130,10 +130,6 @@ struct ftrace_likely_data {
 
 /*
  * Force always-inline if the user requests it so via the .config.
- * GCC does not warn about unused static inline functions for
- * -Wunused-function.  This turns out to avoid the need for complex #ifdef
- * directives.  Suppress the warning in clang as well by using "unused"
- * function attribute, which is redundant but not harmful for gcc.
  * Prefer gnu_inline, so that extern inline functions do not emit an
  * externally visible function. This makes extern inline behave as per gnu89
  * semantics rather than c99. This prevents multiple symbol definition errors
@@ -144,15 +140,27 @@ struct ftrace_likely_data {
  */
 #if !defined(CONFIG_OPTIMIZE_INLINING)
 #define inline inline __attribute__((__always_inline__)) __gnu_inline \
-	__maybe_unused notrace
+	__inline_maybe_unused notrace
 #else
 #define inline inline                                    __gnu_inline \
-	__maybe_unused notrace
+	__inline_maybe_unused notrace
 #endif
 
 #define __inline__ inline
 #define __inline   inline
 
+/*
+ * GCC does not warn about unused static inline functions for -Wunused-function.
+ * Suppress the warning in clang as well by using __maybe_unused, but enable it
+ * for W=1 build. This will allow clang to find unused functions. Remove the
+ * __inline_maybe_unused entirely after fixing most of -Wunused-function warnings.
+ */
+#ifdef KBUILD_EXTRA_WARN1
+#define __inline_maybe_unused
+#else
+#define __inline_maybe_unused __maybe_unused
+#endif
+
 /*
  * Rather then using noinline to prevent stack consumption, use
  * noinline_for_stack instead.  For documentation reasons.

include/linux/export.h

@@ -18,9 +18,6 @@ extern struct module __this_module;
 #define THIS_MODULE ((struct module *)0)
 #endif
 
-#ifdef CONFIG_MODULES
-
-#if defined(__KERNEL__) && !defined(__GENKSYMS__)
 #ifdef CONFIG_MODVERSIONS
 /* Mark the CRC weak since genksyms apparently decides not to
  * generate a checksums for some symbols */
@@ -74,6 +71,12 @@ struct kernel_symbol {
 };
 #endif
 
+#ifdef __GENKSYMS__
+
+#define ___EXPORT_SYMBOL(sym, sec)	__GENKSYMS_EXPORT_SYMBOL(sym)
+
+#else
+
 /* For every exported symbol, place a struct in the __ksymtab section */
 #define ___EXPORT_SYMBOL(sym, sec)					\
 	extern typeof(sym) sym;						\
@@ -83,7 +86,9 @@ struct kernel_symbol {
 	= #sym;								\
 	__KSYMTAB_ENTRY(sym, sec)
 
-#if defined(__DISABLE_EXPORTS)
+#endif
+
+#if !defined(CONFIG_MODULES) || defined(__DISABLE_EXPORTS)
 
 /*
  * Allow symbol exports to be disabled completely so that C code may
@@ -117,18 +122,14 @@ struct kernel_symbol {
 #define __cond_export_sym_0(sym, sec) /* nothing */
 
 #else
-#define __EXPORT_SYMBOL ___EXPORT_SYMBOL
-#endif
 
-#define EXPORT_SYMBOL(sym)					\
+#define __EXPORT_SYMBOL(sym, sec)	___EXPORT_SYMBOL(sym, sec)
-	__EXPORT_SYMBOL(sym, "")
 
-#define EXPORT_SYMBOL_GPL(sym)					\
+#endif /* CONFIG_MODULES */
-	__EXPORT_SYMBOL(sym, "_gpl")
-
-#define EXPORT_SYMBOL_GPL_FUTURE(sym)				\
-	__EXPORT_SYMBOL(sym, "_gpl_future")
 
+#define EXPORT_SYMBOL(sym)		__EXPORT_SYMBOL(sym, "")
+#define EXPORT_SYMBOL_GPL(sym)		__EXPORT_SYMBOL(sym, "_gpl")
+#define EXPORT_SYMBOL_GPL_FUTURE(sym)	__EXPORT_SYMBOL(sym, "_gpl_future")
 #ifdef CONFIG_UNUSED_SYMBOLS
 #define EXPORT_UNUSED_SYMBOL(sym)	__EXPORT_SYMBOL(sym, "_unused")
 #define EXPORT_UNUSED_SYMBOL_GPL(sym)	__EXPORT_SYMBOL(sym, "_unused_gpl")
@@ -137,17 +138,6 @@ struct kernel_symbol {
 #define EXPORT_UNUSED_SYMBOL_GPL(sym)
 #endif
 
-#endif	/* __GENKSYMS__ */
-
-#else /* !CONFIG_MODULES... */
-
-#define EXPORT_SYMBOL(sym)
-#define EXPORT_SYMBOL_GPL(sym)
-#define EXPORT_SYMBOL_GPL_FUTURE(sym)
-#define EXPORT_UNUSED_SYMBOL(sym)
-#define EXPORT_UNUSED_SYMBOL_GPL(sym)
-
-#endif /* CONFIG_MODULES */
 #endif /* !__ASSEMBLY__ */
 
 #endif /* _LINUX_EXPORT_H */

include/linux/vermagic.h

@@ -9,6 +9,8 @@
 #endif
 #ifdef CONFIG_PREEMPT
 #define MODULE_VERMAGIC_PREEMPT "preempt "
+#elif defined(CONFIG_PREEMPT_RT)
+#define MODULE_VERMAGIC_PREEMPT "preempt_rt "
 #else
 #define MODULE_VERMAGIC_PREEMPT ""
 #endif

init/Kconfig

@@ -1234,20 +1234,26 @@ choice
 	default CC_OPTIMIZE_FOR_PERFORMANCE
 
 config CC_OPTIMIZE_FOR_PERFORMANCE
-	bool "Optimize for performance"
+	bool "Optimize for performance (-O2)"
 	help
 	  This is the default optimization level for the kernel, building
 	  with the "-O2" compiler flag for best performance and most
 	  helpful compile-time warnings.
 
-config CC_OPTIMIZE_FOR_SIZE
+config CC_OPTIMIZE_FOR_PERFORMANCE_O3
-	bool "Optimize for size"
+	bool "Optimize more for performance (-O3)"
+	depends on ARC
 	imply CC_DISABLE_WARN_MAYBE_UNINITIALIZED  # avoid false positives
 	help
-	  Enabling this option will pass "-Os" instead of "-O2" to
+	  Choosing this option will pass "-O3" to your compiler to optimize
-	  your compiler resulting in a smaller kernel.
+	  the kernel yet more for performance.
 
-	  If unsure, say N.
+config CC_OPTIMIZE_FOR_SIZE
+	bool "Optimize for size (-Os)"
+	imply CC_DISABLE_WARN_MAYBE_UNINITIALIZED  # avoid false positives
+	help
+	  Choosing this option will pass "-Os" to your compiler resulting
+	  in a smaller kernel.
 
 endchoice
 
@@ -2014,6 +2020,14 @@ config MODVERSIONS
 	  make them incompatible with the kernel you are running.  If
 	  unsure, say N.
 
+config ASM_MODVERSIONS
+	bool
+	default HAVE_ASM_MODVERSIONS && MODVERSIONS
+	help
+	  This enables module versioning for exported symbols also from
+	  assembly. This can be enabled only when the target architecture
+	  supports it.
+
 config MODULE_REL_CRCS
 	bool
 	depends on MODVERSIONS

init/Makefile

@@ -34,4 +34,5 @@ silent_chk_compile.h = :
 include/generated/compile.h: FORCE
 	@$($(quiet)chk_compile.h)
 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@	\
-	"$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" "$(CC) $(KBUILD_CFLAGS)"
+	"$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)"	\
+	"$(CONFIG_PREEMPT_RT)" "$(CC) $(KBUILD_CFLAGS)"

kernel/Makefile

@@ -127,7 +127,7 @@ $(obj)/config_data.gz: $(KCONFIG_CONFIG) FORCE
 $(obj)/kheaders.o: $(obj)/kheaders_data.tar.xz
 
 quiet_cmd_genikh = CHK     $(obj)/kheaders_data.tar.xz
-cmd_genikh = $(CONFIG_SHELL) $(srctree)/kernel/gen_kheaders.sh $@
+      cmd_genikh = $(BASH) $(srctree)/kernel/gen_kheaders.sh $@
 $(obj)/kheaders_data.tar.xz: FORCE
 	$(call cmd,genikh)
 

scripts/Kconfig.include

@@ -35,5 +35,8 @@ ld-option = $(success,$(LD) -v $(1))
 $(error-if,$(failure,command -v $(CC)),compiler '$(CC)' not found)
 $(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found)
 
+# Fail if the linker is gold as it's not capable of linking the kernel proper
+$(error-if,$(success, $(LD) -v | grep -q gold), gold linker '$(LD)' not supported)
+
 # gcc version including patch level
 gcc-version := $(shell,$(srctree)/scripts/gcc-version.sh $(CC))

scripts/Makefile

@@ -36,4 +36,4 @@ subdir-$(CONFIG_MODVERSIONS) += genksyms
 subdir-$(CONFIG_SECURITY_SELINUX) += selinux
 
 # Let clean descend into subdirs
-subdir-	+= basic dtc gdb kconfig mod package
+subdir-	+= basic dtc gdb kconfig mod

scripts/Makefile.build

@@ -52,7 +52,7 @@ ifndef obj
 $(warning kbuild: Makefile.build is included improperly)
 endif
 
-ifeq ($(MAKECMDGOALS)$(need-modorder),)
+ifeq ($(need-modorder),)
 ifneq ($(obj-m),)
 $(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.)
 $(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.)
@@ -76,11 +76,6 @@ endif
 
 mod-targets := $(patsubst %.o, %.mod, $(obj-m))
 
-__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
-	 $(if $(KBUILD_MODULES),$(obj-m) $(mod-targets) $(modorder-target)) \
-	 $(subdir-ym) $(always)
-	@:
-
 # Linus' kernel sanity checking tool
 ifeq ($(KBUILD_CHECKSRC),1)
   quiet_cmd_checksrc       = CHECK   $<
@@ -90,23 +85,13 @@ else ifeq ($(KBUILD_CHECKSRC),2)
         cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
 endif
 
-ifneq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
+ifneq ($(KBUILD_EXTRA_WARN),)
   cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $<
 endif
 
 # Compile C sources (.c)
 # ---------------------------------------------------------------------------
 
-# Default is built-in, unless we know otherwise
-$(foreach x, i ll lst o s symtypes, $(patsubst %.o,%.$(x),$(real-obj-m))): \
-	part-of-module := y
-
-modkern_cflags =                                          \
-	$(if $(part-of-module),                           \
-		$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
-		$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
-quiet_modtag = $(if $(part-of-module),[M],   )
-
 quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@
       cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS), $(c_flags)) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
 
@@ -310,11 +295,6 @@ $(obj)/%.h.s: $(src)/%.h FORCE
 # Compile assembler sources (.S)
 # ---------------------------------------------------------------------------
 
-modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
-
-$(real-obj-m)      : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
-$(real-obj-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
-
 # .S file exports must have their C prototypes defined in asm/asm-prototypes.h
 # or a file that it includes, in order to get versioned symbols. We build a
 # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
@@ -356,11 +336,7 @@ $(obj)/%.s: $(src)/%.S FORCE
 quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
       cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
 
-ifdef CONFIG_MODVERSIONS
+ifdef CONFIG_ASM_MODVERSIONS
-
-ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
-
-ifneq ($(ASM_PROTOTYPES),)
 
 # versioning matches the C process described above, with difference that
 # we parse asm-prototypes.h C header to get function definitions.
@@ -376,7 +352,6 @@ cmd_modversions_S =								\
 		rm -f $(@D)/.tmp_$(@F:.o=.ver);					\
 	fi
 endif
-endif
 
 $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE
 	$(call if_changed_rule,as_o_S)
@@ -395,9 +370,9 @@ $(obj)/%.lds: $(src)/%.lds.S FORCE
 
 # ASN.1 grammar
 # ---------------------------------------------------------------------------
-quiet_cmd_asn1_compiler = ASN.1   $@
+quiet_cmd_asn1_compiler = ASN.1   $(basename $@).[ch]
       cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
-				$(subst .h,.c,$@) $(subst .c,.h,$@)
+				$(basename $@).c $(basename $@).h
 
 $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
 	$(call cmd,asn1_compiler)
@@ -489,12 +464,50 @@ targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \
 	   $(call intermediate_targets, .lex.o, .lex.c) \
 	   $(call intermediate_targets, .tab.o, .tab.c .tab.h)
 
+# Build
+# ---------------------------------------------------------------------------
+
+ifdef single-build
+
+curdir-single := $(sort $(foreach x, $(KBUILD_SINGLE_TARGETS), \
+			$(if $(filter $(x) $(basename $(x)).o, $(targets)), $(x))))
+
+# Handle single targets without any rule: show "Nothing to be done for ..." or
+# "No rule to make target ..." depending on whether the target exists.
+unknown-single := $(filter-out $(addsuffix /%, $(subdir-ym)), \
+			$(filter $(obj)/%, \
+				$(filter-out $(curdir-single), \
+					$(KBUILD_SINGLE_TARGETS))))
+
+__build: $(curdir-single) $(subdir-ym)
+ifneq ($(unknown-single),)
+	$(Q)$(MAKE) -f /dev/null $(unknown-single)
+endif
+	@:
+
+ifeq ($(curdir-single),)
+# Nothing to do in this directory. Do not include any .*.cmd file for speed-up
+targets :=
+else
+targets += $(curdir-single)
+endif
+
+else
+
+__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
+	 $(if $(KBUILD_MODULES),$(obj-m) $(mod-targets) $(modorder-target)) \
+	 $(subdir-ym) $(always)
+	@:
+
+endif
+
 # Descending
 # ---------------------------------------------------------------------------
 
 PHONY += $(subdir-ym)
 $(subdir-ym):
 	$(Q)$(MAKE) $(build)=$@ \
+	$(if $(filter $@/, $(KBUILD_SINGLE_TARGETS)),single-build=) \
 	need-builtin=$(if $(filter $@/built-in.a, $(subdir-obj-y)),1) \
 	need-modorder=$(if $(need-modorder),$(if $(filter $@/modules.order, $(modorder)),1))
 

scripts/Makefile.clean

@@ -17,17 +17,8 @@ include $(if $(wildcard $(kbuild-dir)/Kbuild), $(kbuild-dir)/Kbuild, $(kbuild-di
 # Figure out what we need to build from the various variables
 # ==========================================================================
 
-__subdir-y	:= $(patsubst %/,%,$(filter %/, $(obj-y)))
+subdir-ymn := $(sort $(subdir-y) $(subdir-m) $(subdir-) \
-subdir-y	+= $(__subdir-y)
+		$(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m) $(obj-))))
-__subdir-m	:= $(patsubst %/,%,$(filter %/, $(obj-m)))
-subdir-m	+= $(__subdir-m)
-__subdir-	:= $(patsubst %/,%,$(filter %/, $(obj-)))
-subdir-		+= $(__subdir-)
-
-# Subdirectories we need to descend into
-
-subdir-ym	:= $(sort $(subdir-y) $(subdir-m))
-subdir-ymn      := $(sort $(subdir-ym) $(subdir-))
 
 # Add subdir path
 
@@ -52,26 +43,14 @@ __clean-files   := $(wildcard                                               \
 		   $(addprefix $(obj)/, $(filter-out $(objtree)/%, $(__clean-files))) \
 		   $(filter $(objtree)/%, $(__clean-files)))
 
-# same as clean-files
-
-__clean-dirs    := $(wildcard                                               \
-		   $(addprefix $(obj)/, $(filter-out $(objtree)/%, $(clean-dirs)))    \
-		   $(filter $(objtree)/%, $(clean-dirs)))
-
 # ==========================================================================
 
 quiet_cmd_clean = CLEAN   $(obj)
-      cmd_clean    = rm -f $(__clean-files)
+      cmd_clean = rm -rf $(__clean-files)
-quiet_cmd_cleandir = CLEAN   $(__clean-dirs)
-      cmd_cleandir = rm -rf $(__clean-dirs)
-
 
 __clean: $(subdir-ymn)
 ifneq ($(strip $(__clean-files)),)
-	+$(call cmd,clean)
+	$(call cmd,clean)
-endif
-ifneq ($(strip $(__clean-dirs)),)
-	+$(call cmd,cleandir)
 endif
 	@:
 

scripts/Makefile.extrawarn

@@ -1,74 +1,91 @@
 # SPDX-License-Identifier: GPL-2.0
 # ==========================================================================
-#
 # make W=... settings
 #
-# W=1 - warnings that may be relevant and does not occur too often
+# There are three warning groups enabled by W=1, W=2, W=3.
-# W=2 - warnings that occur quite often but may still be relevant
+# They are independent, and can be combined like W=12 or W=123.
-# W=3 - the more obscure warnings, can most likely be ignored
-#
-# $(call cc-option, -W...) handles gcc -W.. options which
-# are not supported by all versions of the compiler
 # ==========================================================================
 
 KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned)
 
+# backward compatibility
+KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)
+
 ifeq ("$(origin W)", "command line")
-  export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
+  KBUILD_EXTRA_WARN := $(W)
 endif
 
-ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
+export KBUILD_EXTRA_WARN
-warning-  := $(empty)
 
-warning-1 := -Wextra -Wunused -Wno-unused-parameter
+#
-warning-1 += -Wmissing-declarations
+# W=1 - warnings which may be relevant and do not occur too often
-warning-1 += -Wmissing-format-attribute
+#
-warning-1 += -Wmissing-prototypes
+ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)
-warning-1 += -Wold-style-definition
+
-warning-1 += -Wmissing-include-dirs
+KBUILD_CFLAGS += -Wextra -Wunused -Wno-unused-parameter
-warning-1 += $(call cc-option, -Wunused-but-set-variable)
+KBUILD_CFLAGS += -Wmissing-declarations
-warning-1 += $(call cc-option, -Wunused-const-variable)
+KBUILD_CFLAGS += -Wmissing-format-attribute
-warning-1 += $(call cc-option, -Wpacked-not-aligned)
+KBUILD_CFLAGS += -Wmissing-prototypes
-warning-1 += $(call cc-option, -Wstringop-truncation)
+KBUILD_CFLAGS += -Wold-style-definition
+KBUILD_CFLAGS += -Wmissing-include-dirs
+KBUILD_CFLAGS += $(call cc-option, -Wunused-but-set-variable)
+KBUILD_CFLAGS += $(call cc-option, -Wunused-const-variable)
+KBUILD_CFLAGS += $(call cc-option, -Wpacked-not-aligned)
+KBUILD_CFLAGS += $(call cc-option, -Wstringop-truncation)
 # The following turn off the warnings enabled by -Wextra
-warning-1 += -Wno-missing-field-initializers
+KBUILD_CFLAGS += -Wno-missing-field-initializers
-warning-1 += -Wno-sign-compare
+KBUILD_CFLAGS += -Wno-sign-compare
 
-warning-2 += -Wcast-align
+KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1
-warning-2 += -Wdisabled-optimization
-warning-2 += -Wnested-externs
-warning-2 += -Wshadow
-warning-2 += $(call cc-option, -Wlogical-op)
-warning-2 += -Wmissing-field-initializers
-warning-2 += -Wsign-compare
-warning-2 += $(call cc-option, -Wmaybe-uninitialized)
-warning-2 += $(call cc-option, -Wunused-macros)
 
-warning-3 := -Wbad-function-cast
-warning-3 += -Wcast-qual
-warning-3 += -Wconversion
-warning-3 += -Wpacked
-warning-3 += -Wpadded
-warning-3 += -Wpointer-arith
-warning-3 += -Wredundant-decls
-warning-3 += -Wswitch-default
-warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
-
-warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
-warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
-warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
-
-ifeq ("$(strip $(warning))","")
-        $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
-endif
-
-KBUILD_CFLAGS += $(warning)
 else
 
+# Some diagnostics enabled by default are noisy.
+# Suppress them by using -Wno... except for W=1.
+
 ifdef CONFIG_CC_IS_CLANG
 KBUILD_CFLAGS += -Wno-initializer-overrides
 KBUILD_CFLAGS += -Wno-format
 KBUILD_CFLAGS += -Wno-sign-compare
 KBUILD_CFLAGS += -Wno-format-zero-length
 endif
+
+endif
+
+#
+# W=2 - warnings which occur quite often but may still be relevant
+#
+ifneq ($(findstring 2, $(KBUILD_EXTRA_WARN)),)
+
+KBUILD_CFLAGS += -Wcast-align
+KBUILD_CFLAGS += -Wdisabled-optimization
+KBUILD_CFLAGS += -Wnested-externs
+KBUILD_CFLAGS += -Wshadow
+KBUILD_CFLAGS += $(call cc-option, -Wlogical-op)
+KBUILD_CFLAGS += -Wmissing-field-initializers
+KBUILD_CFLAGS += -Wsign-compare
+KBUILD_CFLAGS += $(call cc-option, -Wmaybe-uninitialized)
+KBUILD_CFLAGS += $(call cc-option, -Wunused-macros)
+
+KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN2
+
+endif
+
+#
+# W=3 - more obscure warnings, can most likely be ignored
+#
+ifneq ($(findstring 3, $(KBUILD_EXTRA_WARN)),)
+
+KBUILD_CFLAGS += -Wbad-function-cast
+KBUILD_CFLAGS += -Wcast-qual
+KBUILD_CFLAGS += -Wconversion
+KBUILD_CFLAGS += -Wpacked
+KBUILD_CFLAGS += -Wpadded
+KBUILD_CFLAGS += -Wpointer-arith
+KBUILD_CFLAGS += -Wredundant-decls
+KBUILD_CFLAGS += -Wswitch-default
+KBUILD_CFLAGS += $(call cc-option, -Wpacked-bitfield-compat)
+
+KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN3
+
 endif

scripts/Makefile.host

@@ -1,4 +1,21 @@
 # SPDX-License-Identifier: GPL-2.0
+
+# LEX
+# ---------------------------------------------------------------------------
+quiet_cmd_flex = LEX     $@
+      cmd_flex = $(LEX) -o$@ -L $<
+
+$(obj)/%.lex.c: $(src)/%.l FORCE
+	$(call if_changed,flex)
+
+# YACC
+# ---------------------------------------------------------------------------
+quiet_cmd_bison = YACC    $(basename $@).[ch]
+      cmd_bison = $(YACC) -o $(basename $@).c --defines=$(basename $@).h -t -l $<
+
+$(obj)/%.tab.c $(obj)/%.tab.h: $(src)/%.y FORCE
+	$(call if_changed,bison)
+
 # ==========================================================================
 # Building binaries on the host system
 # Binaries are used during the compilation of the kernel, for example
@@ -63,9 +80,9 @@ host-cxxshobjs	:= $(addprefix $(obj)/,$(host-cxxshobjs))
 # Handle options to gcc. Support building with separate output directory
 
 _hostc_flags   = $(KBUILD_HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   \
-                 $(HOSTCFLAGS_$(basetarget).o)
+                 $(HOSTCFLAGS_$(target-stem).o)
 _hostcxx_flags = $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
-                 $(HOSTCXXFLAGS_$(basetarget).o)
+                 $(HOSTCXXFLAGS_$(target-stem).o)
 
 # $(objtree)/$(obj) for including generated headers from checkin source files
 ifeq ($(KBUILD_EXTMOD),)
@@ -85,7 +102,7 @@ hostcxx_flags  = -Wp,-MD,$(depfile) $(_hostcxx_flags)
 # host-csingle -> Executable
 quiet_cmd_host-csingle 	= HOSTCC  $@
       cmd_host-csingle	= $(HOSTCC) $(hostc_flags) $(KBUILD_HOSTLDFLAGS) -o $@ $< \
-		$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
+		$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
 $(host-csingle): $(obj)/%: $(src)/%.c FORCE
 	$(call if_changed_dep,host-csingle)
 
@@ -93,8 +110,8 @@ $(host-csingle): $(obj)/%: $(src)/%.c FORCE
 # host-cmulti -> executable
 quiet_cmd_host-cmulti	= HOSTLD  $@
       cmd_host-cmulti	= $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -o $@ \
-			  $(addprefix $(obj)/,$($(@F)-objs)) \
+			  $(addprefix $(obj)/, $($(target-stem)-objs)) \
-			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
+			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
 $(host-cmulti): FORCE
 	$(call if_changed,host-cmulti)
 $(call multi_depend, $(host-cmulti), , -objs)
@@ -111,8 +128,8 @@ $(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
 quiet_cmd_host-cxxmulti	= HOSTLD  $@
       cmd_host-cxxmulti	= $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -o $@ \
 			  $(foreach o,objs cxxobjs,\
-			  $(addprefix $(obj)/,$($(@F)-$(o)))) \
+			  $(addprefix $(obj)/, $($(target-stem)-$(o)))) \
-			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
+			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
 $(host-cxxmulti): FORCE
 	$(call if_changed,host-cxxmulti)
 $(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
@@ -144,8 +161,8 @@ $(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE
 # *.o -> .so shared library (host-cshlib)
 quiet_cmd_host-cshlib	= HOSTLLD -shared $@
       cmd_host-cshlib	= $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \
-			  $(addprefix $(obj)/,$($(@F:.so=-objs))) \
+			  $(addprefix $(obj)/, $($(target-stem)-objs)) \
-			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
+			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem).so)
 $(host-cshlib): FORCE
 	$(call if_changed,host-cshlib)
 $(call multi_depend, $(host-cshlib), .so, -objs)
@@ -154,8 +171,8 @@ $(call multi_depend, $(host-cshlib), .so, -objs)
 # *.o -> .so shared library (host-cxxshlib)
 quiet_cmd_host-cxxshlib	= HOSTLLD -shared $@
       cmd_host-cxxshlib	= $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \
-			  $(addprefix $(obj)/,$($(@F:.so=-objs))) \
+			  $(addprefix $(obj)/, $($(target-stem)-objs)) \
-			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
+			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem).so)
 $(host-cxxshlib): FORCE
 	$(call if_changed,host-cxxshlib)
 $(call multi_depend, $(host-cxxshlib), .so, -objs)

scripts/Makefile.lib

@@ -41,9 +41,9 @@ obj-m		:= $(filter-out %/, $(obj-m))
 # Subdirectories we need to descend into
 subdir-ym	:= $(sort $(subdir-y) $(subdir-m))
 
-# if $(foo-objs), $(foo-y), or $(foo-m) exists, foo.o is a composite object
+# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
-multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
+multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))), $(m))))
-multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
+multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))), $(m))))
 multi-used   := $(multi-used-y) $(multi-used-m)
 
 # $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
@@ -52,8 +52,8 @@ subdir-obj-y := $(filter %/built-in.a, $(obj-y))
 
 # Replace multi-part objects by their individual parts,
 # including built-in.a from subdirectories
-real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
+real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
-real-obj-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m)))
+real-obj-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m)))
 
 # DTB
 # If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
@@ -101,6 +101,9 @@ modname-multi = $(subst $(space),:,$(sort $(foreach m,$(multi-used),\
 
 modname = $(if $(modname-multi),$(modname-multi),$(basetarget))
 
+# target with $(obj)/ and its suffix stripped
+target-stem = $(basename $(patsubst $(obj)/%,%,$@))
+
 # These flags are needed for modversions and compiling, so we define them here
 # $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
 # end up in (or would, if it gets compiled in)
@@ -109,12 +112,12 @@ basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
 modname_flags  = -DKBUILD_MODNAME=$(call name-fix,$(modname))
 
 orig_c_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \
-                 $(ccflags-y) $(CFLAGS_$(basetarget).o)
+                 $(ccflags-y) $(CFLAGS_$(target-stem).o)
-_c_flags       = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
+_c_flags       = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), $(orig_c_flags))
 orig_a_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \
-                 $(asflags-y) $(AFLAGS_$(basetarget).o)
+                 $(asflags-y) $(AFLAGS_$(target-stem).o)
-_a_flags       = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
+_a_flags       = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), $(orig_a_flags))
-_cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
+_cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
 
 #
 # Enable gcov profiling flags for a file, directory or for all files depending
@@ -159,6 +162,18 @@ _cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
 endif
 endif
 
+part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
+quiet_modtag = $(if $(part-of-module),[M],   )
+
+modkern_cflags =                                          \
+	$(if $(part-of-module),                           \
+		$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
+		$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
+
+modkern_aflags = $(if $(part-of-module),				\
+			$(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE),	\
+			$(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
+
 c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 		 -include $(srctree)/include/linux/compiler_types.h       \
 		 $(_c_flags) $(modkern_cflags)                           \
@@ -187,28 +202,6 @@ $(foreach m, $(notdir $1), \
 	$(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
 endef
 
-# LEX
-# ---------------------------------------------------------------------------
-quiet_cmd_flex = LEX     $@
-      cmd_flex = $(LEX) -o$@ -L $<
-
-$(obj)/%.lex.c: $(src)/%.l FORCE
-	$(call if_changed,flex)
-
-# YACC
-# ---------------------------------------------------------------------------
-quiet_cmd_bison = YACC    $@
-      cmd_bison = $(YACC) -o$@ -t -l $<
-
-$(obj)/%.tab.c: $(src)/%.y FORCE
-	$(call if_changed,bison)
-
-quiet_cmd_bison_h = YACC    $@
-      cmd_bison_h = $(YACC) -o/dev/null --defines=$@ -t -l $<
-
-$(obj)/%.tab.h: $(src)/%.y FORCE
-	$(call if_changed,bison_h)
-
 # Shipped files
 # ===========================================================================
 
@@ -258,7 +251,7 @@ quiet_cmd_gzip = GZIP    $@
 DTC ?= $(objtree)/scripts/dtc/dtc
 
 # Disable noisy checks by default
-ifeq ($(findstring 1,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),)
+ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
 DTC_FLAGS += -Wno-unit_address_vs_reg \
 	-Wno-unit_address_format \
 	-Wno-avoid_unnecessary_addr_size \
@@ -269,7 +262,7 @@ DTC_FLAGS += -Wno-unit_address_vs_reg \
 	-Wno-pci_device_reg
 endif
 
-ifneq ($(findstring 2,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),)
+ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
 DTC_FLAGS += -Wnode_name_chars_strict \
 	-Wproperty_name_chars_strict
 endif
@@ -374,7 +367,7 @@ UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
 
 quiet_cmd_uimage = UIMAGE  $@
-      cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
+      cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
 			-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
 			-T $(UIMAGE_TYPE) \
 			-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \

scripts/Makefile.modfinal

@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# ===========================================================================
+# Module final link
+# ===========================================================================
+
+PHONY := __modfinal
+__modfinal:
+
+include $(srctree)/scripts/Kbuild.include
+
+# for c_flags
+include $(srctree)/scripts/Makefile.lib
+
+# find all modules listed in modules.order
+modules := $(sort $(shell cat $(MODORDER)))
+
+__modfinal: $(modules)
+	@:
+
+# modname and part-of-module are set to make c_flags define proper module flags
+modname = $(notdir $(@:.mod.o=))
+part-of-module = y
+
+quiet_cmd_cc_o_c = CC [M]  $@
+      cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
+
+%.mod.o: %.mod.c FORCE
+	$(call if_changed_dep,cc_o_c)
+
+ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
+
+quiet_cmd_ld_ko_o = LD [M]  $@
+      cmd_ld_ko_o =                                                     \
+	$(LD) -r $(KBUILD_LDFLAGS)					\
+		$(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE)		\
+		$(addprefix -T , $(KBUILD_LDS_MODULE))			\
+		-o $@ $(filter %.o, $^);				\
+	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
+
+$(modules): %.ko: %.o %.mod.o $(KBUILD_LDS_MODULE) FORCE
+	+$(call if_changed,ld_ko_o)
+
+targets += $(modules) $(modules:.ko=.mod.o)
+
+# Add FORCE to the prequisites of a target to force it to be always rebuilt.
+# ---------------------------------------------------------------------------
+
+PHONY += FORCE
+FORCE:
+
+# Read all saved command lines and dependencies for the $(targets) we
+# may be building above, using $(if_changed{,_dep}). As an
+# optimization, we don't need to read them if the target does not
+# exist, we will rebuild anyway in that case.
+
+existing-targets := $(wildcard $(sort $(targets)))
+
+-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
+
+.PHONY: $(PHONY)

scripts/Makefile.modpost

@@ -15,15 +15,13 @@
 # 2) modpost is then used to
 # 3)  create one <module>.mod.c file pr. module
 # 4)  create one Module.symvers file with CRC for all exported symbols
-# 5) compile all <module>.mod.c files
-# 6) final link of the module to a <module.ko> file
 
 # Step 3 is used to place certain information in the module's ELF
 # section, including information such as:
 #   Version magic (see include/linux/vermagic.h for full details)
 #     - Kernel release
 #     - SMP is CONFIG_SMP
-#     - PREEMPT is CONFIG_PREEMPT
+#     - PREEMPT is CONFIG_PREEMPT[_RT]
 #     - GCC Version
 #   Module info
 #     - Module version (MODULE_VERSION)
@@ -60,13 +58,10 @@ MODPOST = scripts/mod/modpost						\
 
 ifdef MODPOST_VMLINUX
 
-__modpost: vmlinux.o
+quiet_cmd_modpost = MODPOST vmlinux.o
+      cmd_modpost = $(MODPOST) vmlinux.o
 
-quiet_cmd_modpost = MODPOST $@
+__modpost:
-      cmd_modpost = $(MODPOST) $@
-
-PHONY += vmlinux.o
-vmlinux.o:
 	$(call cmd,modpost)
 
 else
@@ -83,73 +78,22 @@ include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \
              $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile)
 endif
 
-include scripts/Makefile.lib
+MODPOST += $(subst -i,-n,$(filter -i,$(MAKEFLAGS))) -s -T - $(wildcard vmlinux)
 
 # find all modules listed in modules.order
 modules := $(sort $(shell cat $(MODORDER)))
 
-# Stop after building .o files if NOFINAL is set. Makes compile tests quicker
+# Read out modules.order instead of expanding $(modules) to pass in modpost.
-__modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules))
+# Otherwise, allmodconfig would fail with "Argument list too long".
-	@:
-
-MODPOST += $(subst -i,-n,$(filter -i,$(MAKEFLAGS))) -s -T - $(wildcard vmlinux)
-
-# We can go over command line length here, so be careful.
 quiet_cmd_modpost = MODPOST $(words $(modules)) modules
       cmd_modpost = sed 's/ko$$/o/' $(MODORDER) | $(MODPOST)
 
-PHONY += modules-modpost
+__modpost:
-modules-modpost:
+	@$(kecho) '  Building modules, stage 2.'
 	$(call cmd,modpost)
-
+ifneq ($(KBUILD_MODPOST_NOFINAL),1)
-# Declare generated files as targets for modpost
+	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
-$(modules:.ko=.mod.c): modules-modpost
+endif
-
-# Step 5), compile all *.mod.c files
-
-# modname is set to make c_flags define KBUILD_MODNAME
-modname = $(notdir $(@:.mod.o=))
-
-quiet_cmd_cc_o_c = CC      $@
-      cmd_cc_o_c = $(CC) $(c_flags) $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE) \
-		   -c -o $@ $<
-
-$(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE
-	$(call if_changed_dep,cc_o_c)
-
-targets += $(modules:.ko=.mod.o)
-
-ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
-
-# Step 6), final link of the modules with optional arch pass after final link
-quiet_cmd_ld_ko_o = LD [M]  $@
-      cmd_ld_ko_o =                                                     \
-	$(LD) -r $(KBUILD_LDFLAGS)                                      \
-                 $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE)             \
-                 -o $@ $(real-prereqs) ;                                \
-	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
-
-$(modules): %.ko :%.o %.mod.o FORCE
-	+$(call if_changed,ld_ko_o)
-
-targets += $(modules)
-
-
-# Add FORCE to the prequisites of a target to force it to be always rebuilt.
-# ---------------------------------------------------------------------------
-
-PHONY += FORCE
-
-FORCE:
-
-# Read all saved command lines and dependencies for the $(targets) we
-# may be building above, using $(if_changed{,_dep}). As an
-# optimization, we don't need to read them if the target does not
-# exist, we will rebuild anyway in that case.
-
-existing-targets := $(wildcard $(sort $(targets)))
-
--include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
 
 endif
 

scripts/Makefile.package

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 # Makefile for the different targets used to generate full packages of a kernel
-# It uses the generic clean infrastructure of kbuild
+
+include $(srctree)/scripts/Kbuild.include
 
 # RPM target
 # ---------------------------------------------------------------------------
@@ -50,7 +51,8 @@ rm -f $(objtree)/.scmversion
 
 # rpm-pkg
 # ---------------------------------------------------------------------------
-rpm-pkg: FORCE
+PHONY += rpm-pkg
+rpm-pkg:
 	$(MAKE) clean
 	$(CONFIG_SHELL) $(MKSPEC) >$(objtree)/kernel.spec
 	$(call cmd,src_tar,$(KERNELPATH),kernel.spec)
@@ -59,15 +61,15 @@ rpm-pkg: FORCE
 
 # binrpm-pkg
 # ---------------------------------------------------------------------------
-binrpm-pkg: FORCE
+PHONY += binrpm-pkg
+binrpm-pkg:
 	$(MAKE) -f $(srctree)/Makefile
 	$(CONFIG_SHELL) $(MKSPEC) prebuilt > $(objtree)/binkernel.spec
 	+rpmbuild $(RPMOPTS) --define "_builddir $(objtree)" --target \
 		$(UTS_MACHINE) -bb $(objtree)/binkernel.spec
 
-clean-files += $(objtree)/*.spec
+PHONY += deb-pkg
-
+deb-pkg:
-deb-pkg: FORCE
 	$(MAKE) clean
 	$(CONFIG_SHELL) $(srctree)/scripts/package/mkdebian
 	$(call cmd,src_tar,$(KDEB_SOURCENAME))
@@ -75,18 +77,19 @@ deb-pkg: FORCE
 		mv $(KDEB_SOURCENAME).tar.gz ../$(KDEB_SOURCENAME)_$${origversion}.orig.tar.gz
 	+dpkg-buildpackage -r$(KBUILD_PKG_ROOTCMD) -a$$(cat debian/arch) $(DPKG_FLAGS) -i.git -us -uc
 
-bindeb-pkg: FORCE
+PHONY += bindeb-pkg
+bindeb-pkg:
 	$(CONFIG_SHELL) $(srctree)/scripts/package/mkdebian
 	+dpkg-buildpackage -r$(KBUILD_PKG_ROOTCMD) -a$$(cat debian/arch) $(DPKG_FLAGS) -b -nc -uc
 
-intdeb-pkg: FORCE
+PHONY += intdeb-pkg
+intdeb-pkg:
 	+$(CONFIG_SHELL) $(srctree)/scripts/package/builddeb
 
-clean-dirs += $(objtree)/debian/
-
 # snap-pkg
 # ---------------------------------------------------------------------------
-snap-pkg: FORCE
+PHONY += snap-pkg
+snap-pkg:
 	rm -rf $(objtree)/snap
 	mkdir $(objtree)/snap
 	$(MAKE) clean
@@ -98,17 +101,14 @@ snap-pkg: FORCE
 	cd $(objtree)/snap && \
 	snapcraft --target-arch=$(UTS_MACHINE)
 
-clean-dirs += $(objtree)/snap/
-
 # tarball targets
 # ---------------------------------------------------------------------------
-tar%pkg: FORCE
+tar-pkgs := tar-pkg targz-pkg tarbz2-pkg tarxz-pkg
+PHONY += $(tar-pkgs)
+$(tar-pkgs):
 	$(MAKE) -f $(srctree)/Makefile
 	+$(CONFIG_SHELL) $(srctree)/scripts/package/buildtar $@
 
-clean-dirs += $(objtree)/tar-install/
-
-
 # perf-pkg - generate a source tarball with perf source
 # ---------------------------------------------------------------------------
 
@@ -133,12 +133,15 @@ $(if $(findstring xz,$@),xz,                                        \
 $(error unknown target $@))))                                       \
 	-f -9 $(perf-tar).tar)
 
-perf-%pkg: FORCE
+perf-tar-pkgs := perf-tar-src-pkg perf-targz-src-pkg perf-tarbz2-src-pkg perf-tarxz-src-pkg
+PHONY += $(perf-tar-pkgs)
+$(perf-tar-pkgs):
 	$(call cmd,perf_tar)
 
 # Help text displayed when executing 'make help'
 # ---------------------------------------------------------------------------
-help: FORCE
+PHONY += help
+help:
 	@echo '  rpm-pkg             - Build both source and binary RPM kernel packages'
 	@echo '  binrpm-pkg          - Build only the binary kernel RPM package'
 	@echo '  deb-pkg             - Build both source and binary deb kernel packages'
@@ -152,3 +155,5 @@ help: FORCE
 	@echo '  perf-targz-src-pkg  - Build $(perf-tar).tar.gz source tarball'
 	@echo '  perf-tarbz2-src-pkg - Build $(perf-tar).tar.bz2 source tarball'
 	@echo '  perf-tarxz-src-pkg  - Build $(perf-tar).tar.xz source tarball'
+
+.PHONY: $(PHONY)

scripts/basic/Makefile

@@ -1,16 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0-only
-###
+#
-# This Makefile lists the most basic programs used during the build process.
+# fixdep: used to generate dependency information during build process
-# The programs listed herein are what are needed to do the basic stuff,
-# such as fix file dependencies.
-# This initial step is needed to avoid files to be recompiled
-# when kernel configuration changes (which is what happens when
-# .config is included by main Makefile.
-# ---------------------------------------------------------------------------
-# fixdep: 	 Used to generate dependency information during build process
 
 hostprogs-y	:= fixdep
 always		:= $(hostprogs-y)
-
-# fixdep is needed to compile other host programs
-$(addprefix $(obj)/,$(filter-out fixdep,$(always))): $(obj)/fixdep

scripts/genksyms/Makefile

@@ -12,22 +12,15 @@ genksyms-objs	:= genksyms.o parse.tab.o lex.lex.o
 #
 # Just in case, run "$(YACC) --version" without suppressing stderr
 # so that 'bison: not found' will be displayed if it is missing.
-ifeq ($(findstring 1,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),)
+ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
 
 quiet_cmd_bison_no_warn = $(quiet_cmd_bison)
       cmd_bison_no_warn = $(YACC) --version >/dev/null; \
 			  $(cmd_bison) 2>/dev/null
 
-$(obj)/parse.tab.c: $(src)/parse.y FORCE
+$(obj)/pars%.tab.c $(obj)/pars%.tab.h: $(src)/pars%.y FORCE
 	$(call if_changed,bison_no_warn)
 
-quiet_cmd_bison_h_no_warn = $(quiet_cmd_bison_h)
-      cmd_bison_h_no_warn = $(YACC) --version >/dev/null; \
-			    $(cmd_bison_h) 2>/dev/null
-
-$(obj)/parse.tab.h: $(src)/parse.y FORCE
-	$(call if_changed,bison_h_no_warn)
-
 endif
 
 # -I needed for generated C source (shipped source)

scripts/genksyms/keywords.c

@@ -3,11 +3,7 @@ static struct resword {
 	const char *name;
 	int token;
 } keywords[] = {
-	{ "EXPORT_SYMBOL", EXPORT_SYMBOL_KEYW },
+	{ "__GENKSYMS_EXPORT_SYMBOL", EXPORT_SYMBOL_KEYW },
-	{ "EXPORT_SYMBOL_GPL", EXPORT_SYMBOL_KEYW },
-	{ "EXPORT_SYMBOL_GPL_FUTURE", EXPORT_SYMBOL_KEYW },
-	{ "EXPORT_UNUSED_SYMBOL", EXPORT_SYMBOL_KEYW },
-	{ "EXPORT_UNUSED_SYMBOL_GPL", EXPORT_SYMBOL_KEYW },
 	{ "__asm", ASM_KEYW },
 	{ "__asm__", ASM_KEYW },
 	{ "__attribute", ATTRIBUTE_KEYW },

scripts/genksyms/lex.l

@@ -1,25 +1,13 @@
-/* Lexical analysis for genksyms.
+/* SPDX-License-Identifier: GPL-2.0-or-later */
-   Copyright 1996, 1997 Linux International.
+/*
-
+ * Lexical analysis for genksyms.
-   New implementation contributed by Richard Henderson <rth@tamu.edu>
+ * Copyright 1996, 1997 Linux International.
-   Based on original work by Bjorn Ekwall <bj0rn@blox.se>
+ *
-
+ * New implementation contributed by Richard Henderson <rth@tamu.edu>
-   Taken from Linux modutils 2.4.22.
+ * Based on original work by Bjorn Ekwall <bj0rn@blox.se>
-
+ *
-   This program is free software; you can redistribute it and/or modify it
+ * Taken from Linux modutils 2.4.22.
-   under the terms of the GNU General Public License as published by the
+ */
-   Free Software Foundation; either version 2 of the License, or (at your
-   option) any later version.
-
-   This program is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software Foundation,
-   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
-
 
 %{
 

scripts/genksyms/parse.y

@@ -1,25 +1,13 @@
-/* C global declaration parser for genksyms.
+/* SPDX-License-Identifier: GPL-2.0-or-later */
-   Copyright 1996, 1997 Linux International.
+/*
-
+ * C global declaration parser for genksyms.
-   New implementation contributed by Richard Henderson <rth@tamu.edu>
+ * Copyright 1996, 1997 Linux International.
-   Based on original work by Bjorn Ekwall <bj0rn@blox.se>
+ *
-
+ * New implementation contributed by Richard Henderson <rth@tamu.edu>
-   This file is part of the Linux modutils.
+ * Based on original work by Bjorn Ekwall <bj0rn@blox.se>
-
+ *
-   This program is free software; you can redistribute it and/or modify it
+ * This file is part of the Linux modutils.
-   under the terms of the GNU General Public License as published by the
+ */
-   Free Software Foundation; either version 2 of the License, or (at your
-   option) any later version.
-
-   This program is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software Foundation,
-   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
-
 
 %{
 

scripts/headers_install.sh

@@ -41,5 +41,77 @@ sed -E -e '
 scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__ $TMPFILE > $OUTFILE
 [ $? -gt 1 ] && exit 1
 
+# Remove /* ... */ style comments, and find CONFIG_ references in code
+configs=$(sed -e '
+:comment
+	s:/\*[^*][^*]*:/*:
+	s:/\*\*\**\([^/]\):/*\1:
+	t comment
+	s:/\*\*/: :
+	t comment
+	/\/\*/! b check
+	N
+	b comment
+:print
+	P
+	D
+:check
+	s:^\(CONFIG_[[:alnum:]_]*\):\1\n:
+	t print
+	s:^[[:alnum:]_][[:alnum:]_]*::
+	s:^[^[:alnum:]_][^[:alnum:]_]*::
+	t check
+	d
+' $OUTFILE)
+
+# The entries in the following list are not warned.
+# Please do not add a new entry. This list is only for existing ones.
+# The list will be reduced gradually, and deleted eventually. (hopefully)
+#
+# The format is <file-name>:<CONFIG-option> in each line.
+config_leak_ignores="
+arch/alpha/include/uapi/asm/setup.h:CONFIG_ALPHA_LEGACY_START_ADDRESS
+arch/arc/include/uapi/asm/page.h:CONFIG_ARC_PAGE_SIZE_16K
+arch/arc/include/uapi/asm/page.h:CONFIG_ARC_PAGE_SIZE_4K
+arch/arc/include/uapi/asm/swab.h:CONFIG_ARC_HAS_SWAPE
+arch/arm/include/uapi/asm/ptrace.h:CONFIG_CPU_ENDIAN_BE8
+arch/hexagon/include/uapi/asm/ptrace.h:CONFIG_HEXAGON_ARCH_VERSION
+arch/hexagon/include/uapi/asm/user.h:CONFIG_HEXAGON_ARCH_VERSION
+arch/ia64/include/uapi/asm/cmpxchg.h:CONFIG_IA64_DEBUG_CMPXCHG
+arch/m68k/include/uapi/asm/ptrace.h:CONFIG_COLDFIRE
+arch/nios2/include/uapi/asm/swab.h:CONFIG_NIOS2_CI_SWAB_NO
+arch/nios2/include/uapi/asm/swab.h:CONFIG_NIOS2_CI_SWAB_SUPPORT
+arch/sh/include/uapi/asm/ptrace.h:CONFIG_CPU_SH5
+arch/sh/include/uapi/asm/sigcontext.h:CONFIG_CPU_SH5
+arch/sh/include/uapi/asm/stat.h:CONFIG_CPU_SH5
+arch/x86/include/uapi/asm/auxvec.h:CONFIG_IA32_EMULATION
+arch/x86/include/uapi/asm/auxvec.h:CONFIG_X86_64
+arch/x86/include/uapi/asm/mman.h:CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
+include/uapi/asm-generic/fcntl.h:CONFIG_64BIT
+include/uapi/linux/atmdev.h:CONFIG_COMPAT
+include/uapi/linux/elfcore.h:CONFIG_BINFMT_ELF_FDPIC
+include/uapi/linux/eventpoll.h:CONFIG_PM_SLEEP
+include/uapi/linux/hw_breakpoint.h:CONFIG_HAVE_MIXED_BREAKPOINTS_REGS
+include/uapi/linux/pktcdvd.h:CONFIG_CDROM_PKTCDVD_WCACHE
+include/uapi/linux/raw.h:CONFIG_MAX_RAW_DEVS
+"
+
+for c in $configs
+do
+	warn=1
+
+	for ignore in $config_leak_ignores
+	do
+		if echo "$INFILE:$c" | grep -q "$ignore$"; then
+			warn=
+			break
+		fi
+	done
+
+	if [ "$warn" = 1 ]; then
+		echo "warning: $INFILE: leak $c to user-space" >&2
+	fi
+done
+
 rm -f $TMPFILE
 trap - EXIT

scripts/kconfig/Makefile

@@ -114,7 +114,7 @@ testconfig: $(obj)/conf
 	$(PYTHON3) -B -m pytest $(srctree)/$(src)/tests \
 	-o cache_dir=$(abspath $(obj)/tests/.cache) \
 	$(if $(findstring 1,$(KBUILD_VERBOSE)),--capture=no)
-clean-dirs += tests/.cache
+clean-files += tests/.cache
 
 # Help text used by make help
 help:
@@ -166,15 +166,15 @@ $(obj)/nconf.o $(obj)/nconf.gui.o: $(obj)/nconf-cfg
 
 # mconf: Used for the menuconfig target based on lxdialog
 hostprogs-y	+= mconf
-lxdialog	:= checklist.o inputbox.o menubox.o textbox.o util.o yesno.o
+lxdialog	:= $(addprefix lxdialog/, \
-mconf-objs	:= mconf.o $(addprefix lxdialog/, $(lxdialog)) $(common-objs)
+		     checklist.o inputbox.o menubox.o textbox.o util.o yesno.o)
+mconf-objs	:= mconf.o $(lxdialog) $(common-objs)
 
 HOSTLDLIBS_mconf = $(shell . $(obj)/mconf-cfg && echo $$libs)
 $(foreach f, mconf.o $(lxdialog), \
   $(eval HOSTCFLAGS_$f = $$(shell . $(obj)/mconf-cfg && echo $$$$cflags)))
 
-$(obj)/mconf.o: $(obj)/mconf-cfg
+$(addprefix $(obj)/, mconf.o $(lxdialog)): $(obj)/mconf-cfg
-$(addprefix $(obj)/lxdialog/, $(lxdialog)): $(obj)/mconf-cfg
 
 # qconf: Used for the xconfig target based on Qt
 hostprogs-y	+= qconf

scripts/kconfig/merge_config.sh

@@ -13,12 +13,12 @@
 #  Copyright (c) 2009-2010 Wind River Systems, Inc.
 #  Copyright 2011 Linaro
 
+set -e
+
 clean_up() {
 	rm -f $TMP_FILE
 	rm -f $MERGE_FILE
-	exit
 }
-trap clean_up HUP INT TERM
 
 usage() {
 	echo "Usage: $0 [OPTIONS] [CONFIG [...]]"
@@ -110,6 +110,9 @@ TMP_FILE=$(mktemp ./.tmp.config.XXXXXXXXXX)
 MERGE_FILE=$(mktemp ./.merge_tmp.config.XXXXXXXXXX)
 
 echo "Using $INITFILE as base"
+
+trap clean_up EXIT
+
 cat $INITFILE > $TMP_FILE
 
 # Merge files, printing warnings on overridden values
@@ -155,7 +158,6 @@ if [ "$RUNMAKE" = "false" ]; then
 	echo "#"
 	echo "# merged configuration written to $KCONFIG_CONFIG (needs make)"
 	echo "#"
-	clean_up
 	exit
 fi
 
@@ -177,7 +179,7 @@ make KCONFIG_ALLCONFIG=$TMP_FILE $OUTPUT_ARG $ALLTARGET
 for CFG in $(sed -n -e "$SED_CONFIG_EXP1" -e "$SED_CONFIG_EXP2" $TMP_FILE); do
 
 	REQUESTED_VAL=$(grep -w -e "$CFG" $TMP_FILE)
-	ACTUAL_VAL=$(grep -w -e "$CFG" "$KCONFIG_CONFIG")
+	ACTUAL_VAL=$(grep -w -e "$CFG" "$KCONFIG_CONFIG" || true)
 	if [ "x$REQUESTED_VAL" != "x$ACTUAL_VAL" ] ; then
 		echo "Value requested for $CFG not in final .config"
 		echo "Requested value:  $REQUESTED_VAL"
@@ -185,5 +187,3 @@ for CFG in $(sed -n -e "$SED_CONFIG_EXP1" -e "$SED_CONFIG_EXP2" $TMP_FILE); do
 		echo ""
 	fi
 done
-
-clean_up

scripts/link-vmlinux.sh

@@ -64,6 +64,8 @@ vmlinux_link()
 	local output=${1}
 	local objects
 
+	info LD ${output}
+
 	# skip output file argument
 	shift
 
@@ -157,6 +159,18 @@ kallsyms()
 	${CC} ${aflags} -c -o ${2} ${afile}
 }
 
+# Perform one step in kallsyms generation, including temporary linking of
+# vmlinux.
+kallsyms_step()
+{
+	kallsymso_prev=${kallsymso}
+	kallsymso=.tmp_kallsyms${1}.o
+	kallsyms_vmlinux=.tmp_vmlinux${1}
+
+	vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o}
+	kallsyms ${kallsyms_vmlinux} ${kallsymso}
+}
+
 # Create map file with all symbols from ${1}
 # See mksymap for additional details
 mksysmap()
@@ -243,6 +257,7 @@ if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then
 fi
 
 kallsymso=""
+kallsymso_prev=""
 kallsyms_vmlinux=""
 if [ -n "${CONFIG_KALLSYMS}" ]; then
 
@@ -269,32 +284,19 @@ if [ -n "${CONFIG_KALLSYMS}" ]; then
 	# a)  Verify that the System.map from vmlinux matches the map from
 	#     ${kallsymso}.
 
-	kallsymso=.tmp_kallsyms2.o
+	kallsyms_step 1
-	kallsyms_vmlinux=.tmp_vmlinux2
+	kallsyms_step 2
-
-	# step 1
-	vmlinux_link .tmp_vmlinux1 ${btf_vmlinux_bin_o}
-	kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
-
-	# step 2
-	vmlinux_link .tmp_vmlinux2 .tmp_kallsyms1.o ${btf_vmlinux_bin_o}
-	kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
 
 	# step 3
-	size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms1.o)
+	size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso_prev})
-	size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms2.o)
+	size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso})
 
 	if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
-		kallsymso=.tmp_kallsyms3.o
+		kallsyms_step 3
-		kallsyms_vmlinux=.tmp_vmlinux3
-
-		vmlinux_link .tmp_vmlinux3 .tmp_kallsyms2.o ${btf_vmlinux_bin_o}
-		kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
 	fi
 fi
 
-info LD vmlinux
+vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o}
-vmlinux_link vmlinux "${kallsymso}" "${btf_vmlinux_bin_o}"
 
 if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
 	info SORTEX vmlinux

scripts/mkcompile_h

@@ -5,7 +5,8 @@ TARGET=$1
 ARCH=$2
 SMP=$3
 PREEMPT=$4
-CC=$5
+PREEMPT_RT=$5
+CC=$6
 
 vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }
 
@@ -53,6 +54,7 @@ UTS_VERSION="#$VERSION"
 CONFIG_FLAGS=""
 if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
 if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
+if [ -n "$PREEMPT_RT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT_RT"; fi
 UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP"
 
 # Truncate to maximum length

scripts/mkmakefile

@@ -12,6 +12,6 @@ if [ "${quiet}" != "silent_" ]; then
 fi
 
 cat << EOF > Makefile
-# Automatically generated by $(realpath $0): don't edit
+# Automatically generated by $0: don't edit
-include $(realpath $1/Makefile)
+include $1/Makefile
 EOF

scripts/mod/file2alias.c

@@ -34,6 +34,11 @@ typedef Elf64_Addr	kernel_ulong_t;
 typedef uint32_t	__u32;
 typedef uint16_t	__u16;
 typedef unsigned char	__u8;
+typedef struct {
+	__u8 b[16];
+} guid_t;
+
+/* backwards compatibility, don't use in new code */
 typedef struct {
 	__u8 b[16];
 } uuid_le;

scripts/mod/modpost.c

@@ -169,6 +169,7 @@ struct symbol {
 	unsigned int kernel:1;     /* 1 if symbol is from kernel
 				    *  (only for external modules) **/
 	unsigned int preloaded:1;  /* 1 if symbol from Module.symvers, or crc */
+	unsigned int is_static:1;  /* 1 if symbol is not global */
 	enum export  export;       /* Type of export */
 	char name[0];
 };
@@ -201,6 +202,7 @@ static struct symbol *alloc_symbol(const char *name, unsigned int weak,
 	strcpy(s->name, name);
 	s->weak = weak;
 	s->next = next;
+	s->is_static = 1;
 	return s;
 }
 
@@ -795,9 +797,9 @@ static int match(const char *sym, const char * const pat[])
 
 		/* "*foo*" */
 		if (*p == '*' && *endp == '*') {
-			char *here, *bare = strndup(p + 1, strlen(p) - 2);
+			char *bare = NOFAIL(strndup(p + 1, strlen(p) - 2));
+			char *here = strstr(sym, bare);
 
-			here = strstr(sym, bare);
 			free(bare);
 			if (here != NULL)
 				return 1;
@@ -1980,6 +1982,21 @@ static void read_symbols(const char *modname)
 		handle_modversions(mod, &info, sym, symname);
 		handle_moddevtable(mod, &info, sym, symname);
 	}
+
+	// check for static EXPORT_SYMBOL_* functions && global vars
+	for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
+		unsigned char bind = ELF_ST_BIND(sym->st_info);
+
+		if (bind == STB_GLOBAL || bind == STB_WEAK) {
+			struct symbol *s =
+				find_symbol(remove_dot(info.strtab +
+						       sym->st_name));
+
+			if (s)
+				s->is_static = 0;
+		}
+	}
+
 	if (!is_vmlinux(modname) || vmlinux_section_warnings)
 		check_sec_ref(mod, modname, &info);
 
@@ -2159,7 +2176,7 @@ static void add_header(struct buffer *b, struct module *mod)
 	buf_printf(b, "MODULE_INFO(name, KBUILD_MODNAME);\n");
 	buf_printf(b, "\n");
 	buf_printf(b, "__visible struct module __this_module\n");
-	buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
+	buf_printf(b, "__section(.gnu.linkonce.this_module) = {\n");
 	buf_printf(b, "\t.name = KBUILD_MODNAME,\n");
 	if (mod->has_init)
 		buf_printf(b, "\t.init = init_module,\n");
@@ -2213,8 +2230,7 @@ static int add_versions(struct buffer *b, struct module *mod)
 
 	buf_printf(b, "\n");
 	buf_printf(b, "static const struct modversion_info ____versions[]\n");
-	buf_printf(b, "__used\n");
+	buf_printf(b, "__used __section(__versions) = {\n");
-	buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
 
 	for (s = mod->unres; s; s = s->next) {
 		if (!s->module)
@@ -2250,10 +2266,7 @@ static void add_depends(struct buffer *b, struct module *mod)
 			s->module->seen = is_vmlinux(s->module->name);
 
 	buf_printf(b, "\n");
-	buf_printf(b, "static const char __module_depends[]\n");
+	buf_printf(b, "MODULE_INFO(depends, \"");
-	buf_printf(b, "__used\n");
-	buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
-	buf_printf(b, "\"depends=");
 	for (s = mod->unres; s; s = s->next) {
 		const char *p;
 		if (!s->module)
@@ -2271,7 +2284,7 @@ static void add_depends(struct buffer *b, struct module *mod)
 		buf_printf(b, "%s%s", first ? "" : ",", p);
 		first = 0;
 	}
-	buf_printf(b, "\";\n");
+	buf_printf(b, "\");\n");
 }
 
 static void add_srcversion(struct buffer *b, struct module *mod)
@@ -2369,6 +2382,7 @@ static void read_dump(const char *fname, unsigned int kernel)
 		s = sym_add_exported(symname, mod, export_no(export));
 		s->kernel    = kernel;
 		s->preloaded = 1;
+		s->is_static = 0;
 		sym_update_crc(symname, mod, crc, export_no(export));
 	}
 	release_file(file, size);
@@ -2425,6 +2439,7 @@ int main(int argc, char **argv)
 	char *dump_write = NULL, *files_source = NULL;
 	int opt;
 	int err;
+	int n;
 	struct ext_sym_list *extsym_iter;
 	struct ext_sym_list *extsym_start = NULL;
 
@@ -2520,6 +2535,19 @@ int main(int argc, char **argv)
 	if (sec_mismatch_count && sec_mismatch_fatal)
 		fatal("modpost: Section mismatches detected.\n"
 		      "Set CONFIG_SECTION_MISMATCH_WARN_ONLY=y to allow them.\n");
+	for (n = 0; n < SYMBOL_HASH_SIZE; n++) {
+		struct symbol *s = symbolhash[n];
+
+		while (s) {
+			if (s->is_static)
+				warn("\"%s\" [%s] is a static %s\n",
+				     s->name, s->module->name,
+				     export_str(s->export));
+
+			s = s->next;
+		}
+	}
+
 	free(buf.p);
 
 	return err;

usr/include/Makefile

@@ -115,6 +115,4 @@ header-test-y += $(filter-out $(header-test-), \
 			$(patsubst $(obj)/%,%, $(wildcard \
 			$(addprefix $(obj)/, *.h */*.h */*/*.h */*/*/*.h))))
 
-# For GNU Make <= 4.2.1, $(wildcard $(obj)/*/) matches to not only directories
+clean-files += $(filter-out Makefile, $(notdir $(wildcard $(obj)/*)))
-# but also regular files. Use $(filter %/, ...) just in case.
-clean-dirs += $(patsubst $(obj)/%/,%,$(filter %/, $(wildcard $(obj)/*/)))