Kbuild fixes for v6.1

- Fix CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y compile error for
    the combination of Clang >= 14 and GAS <= 2.35.
 
  - Drop vmlinux.bz2 from the rpm package as it just annoyingly increased
    the package size.
 
  - Fix modpost error under build environments using musl.
 
  - Make *.ll files keep value names for easier debugging
 
  - Fix single directory build
 
  - Prevent RISC-V from selecting the broken DWARF5 support when Clang
    and GAS are used together.
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Merge tag 'kbuild-fixes-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild fixes from Masahiro Yamada:

 - Fix CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y compile error for the
   combination of Clang >= 14 and GAS <= 2.35.

 - Drop vmlinux.bz2 from the rpm package as it just annoyingly increased
   the package size.

 - Fix modpost error under build environments using musl.

 - Make *.ll files keep value names for easier debugging

 - Fix single directory build

 - Prevent RISC-V from selecting the broken DWARF5 support when Clang
   and GAS are used together.

* tag 'kbuild-fixes-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  lib/Kconfig.debug: Add check for non-constant .{s,u}leb128 support to DWARF5
  kbuild: fix single directory build
  kbuild: add -fno-discard-value-names to cmd_cc_ll_c
  scripts/clang-tools: Convert clang-tidy args to list
  modpost: put modpost options before argument
  kbuild: Stop including vmlinux.bz2 in the rpm's
  Kconfig.debug: add toolchain checks for DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
  Kconfig.debug: simplify the dependency of DEBUG_INFO_DWARF4/5

Makefile

@@ -1979,6 +1979,8 @@ endif
 
 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
 
+KBUILD_MODULES := 1
+
 endif
 
 # Preset locale variables to speed up the build process. Limit locale

lib/Kconfig.debug

@@ -231,6 +231,11 @@ config DEBUG_INFO
 	  in the "Debug information" choice below, indicating that debug
 	  information will be generated for build targets.
 
+# Clang is known to generate .{s,u}leb128 with symbol deltas with DWARF5, which
+# some targets may not support: https://sourceware.org/bugzilla/show_bug.cgi?id=27215
+config AS_HAS_NON_CONST_LEB128
+	def_bool $(as-instr,.uleb128 .Lexpr_end4 - .Lexpr_start3\n.Lexpr_start3:\n.Lexpr_end4:)
+
 choice
 	prompt "Debug information"
 	depends on DEBUG_KERNEL
@@ -253,6 +258,7 @@ config DEBUG_INFO_NONE
 config DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
 	bool "Rely on the toolchain's implicit default DWARF version"
 	select DEBUG_INFO
+	depends on !CC_IS_CLANG || AS_IS_LLVM || CLANG_VERSION < 140000 || (AS_IS_GNU && AS_VERSION >= 23502 && AS_HAS_NON_CONST_LEB128)
 	help
 	  The implicit default version of DWARF debug info produced by a
 	  toolchain changes over time.
@@ -264,7 +270,7 @@ config DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
 config DEBUG_INFO_DWARF4
 	bool "Generate DWARF Version 4 debuginfo"
 	select DEBUG_INFO
-	depends on !CC_IS_CLANG || (CC_IS_CLANG && (AS_IS_LLVM || (AS_IS_GNU && AS_VERSION >= 23502)))
+	depends on !CC_IS_CLANG || AS_IS_LLVM || (AS_IS_GNU && AS_VERSION >= 23502)
 	help
 	  Generate DWARF v4 debug info. This requires gcc 4.5+, binutils 2.35.2
 	  if using clang without clang's integrated assembler, and gdb 7.0+.
@@ -276,7 +282,7 @@ config DEBUG_INFO_DWARF4
 config DEBUG_INFO_DWARF5
 	bool "Generate DWARF Version 5 debuginfo"
 	select DEBUG_INFO
-	depends on !CC_IS_CLANG || (CC_IS_CLANG && (AS_IS_LLVM || (AS_IS_GNU && AS_VERSION >= 23502)))
+	depends on !CC_IS_CLANG || AS_IS_LLVM || (AS_IS_GNU && AS_VERSION >= 23502 && AS_HAS_NON_CONST_LEB128)
 	help
 	  Generate DWARF v5 debug info. Requires binutils 2.35.2, gcc 5.0+ (gcc
 	  5.0+ accepts the -gdwarf-5 flag but only had partial support for some

scripts/Makefile.build

@@ -140,7 +140,7 @@ $(obj)/%.symtypes : $(src)/%.c FORCE
 # LLVM assembly
 # Generate .ll files from .c
 quiet_cmd_cc_ll_c = CC $(quiet_modtag)  $@
-      cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
+      cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -fno-discard-value-names -o $@ $<
 
 $(obj)/%.ll: $(src)/%.c FORCE
 	$(call if_changed_dep,cc_ll_c)

scripts/Makefile.modpost

@@ -119,7 +119,7 @@ quiet_cmd_modpost = MODPOST $@
 		echo >&2 "WARNING: $(missing-input) is missing."; \
 		echo >&2 "         Modules may not have dependencies or modversions."; \
 		echo >&2 "         You may get many unresolved symbol warnings.";) \
-	sed 's/ko$$/o/' $(or $(modorder-if-needed), /dev/null) | $(MODPOST) $(modpost-args) $(vmlinux.o-if-present) -T -
+	sed 's/ko$$/o/' $(or $(modorder-if-needed), /dev/null) | $(MODPOST) $(modpost-args) -T - $(vmlinux.o-if-present)
 
 targets += $(output-symdump)
 $(output-symdump): $(modorder-if-needed) $(vmlinux.o-if-present) $(moudle.symvers-if-present) $(MODPOST) FORCE

scripts/clang-tools/run-clang-tools.py

@@ -45,13 +45,14 @@ def init(l, a):
 
 def run_analysis(entry):
     # Disable all checks, then re-enable the ones we want
-    checks = "-checks=-*,"
+    checks = []
+    checks.append("-checks=-*")
     if args.type == "clang-tidy":
-        checks += "linuxkernel-*"
+        checks.append("linuxkernel-*")
     else:
-        checks += "clang-analyzer-*"
-        checks += ",-clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling"
-    p = subprocess.run(["clang-tidy", "-p", args.path, checks, entry["file"]],
+        checks.append("clang-analyzer-*")
+        checks.append("-clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling")
+    p = subprocess.run(["clang-tidy", "-p", args.path, ",".join(checks), entry["file"]],
                        stdout=subprocess.PIPE,
                        stderr=subprocess.STDOUT,
                        cwd=entry["directory"])

scripts/package/mkspec

@@ -97,8 +97,6 @@ $M	$MAKE %{?_smp_mflags} INSTALL_MOD_PATH=%{buildroot} modules_install
 	$MAKE %{?_smp_mflags} INSTALL_HDR_PATH=%{buildroot}/usr headers_install
 	cp System.map %{buildroot}/boot/System.map-$KERNELRELEASE
 	cp .config %{buildroot}/boot/config-$KERNELRELEASE
-	bzip2 -9 --keep vmlinux
-	mv vmlinux.bz2 %{buildroot}/boot/vmlinux-$KERNELRELEASE.bz2
 $S$M	rm -f %{buildroot}/lib/modules/$KERNELRELEASE/build
 $S$M	rm -f %{buildroot}/lib/modules/$KERNELRELEASE/source
 $S$M	mkdir -p %{buildroot}/usr/src/kernels/$KERNELRELEASE