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Baoquan He 2d16a9f778 kernel/Kconfig.kexec: drop select of KEXEC for CRASH_DUMP 
[ Upstream commit dccf78d39f1069a5ddf4328bf0c97aa5f2f4296e ]

Ignat Korchagin complained that a potential config regression was
introduced by commit 89cde45591 ("kexec: consolidate kexec and crash
options into kernel/Kconfig.kexec").  Before the commit, CONFIG_CRASH_DUMP
has no dependency on CONFIG_KEXEC.  After the commit, CRASH_DUMP selects
KEXEC.  That enforces system to have CONFIG_KEXEC=y as long as
CONFIG_CRASH_DUMP=Y which people may not want.

In Ignat's case, he sets CONFIG_CRASH_DUMP=y, CONFIG_KEXEC_FILE=y and
CONFIG_KEXEC=n because kexec_load interface could have security issue if
kernel/initrd has no chance to be signed and verified.

CRASH_DUMP has select of KEXEC because Eric, author of above commit, met a
LKP report of build failure when posting patch of earlier version.  Please
see below link to get detail of the LKP report:

    https://lore.kernel.org/all/3e8eecd1-a277-2cfb-690e-5de2eb7b988e@oracle.com/T/#u

In fact, that LKP report is triggered because arm's <asm/kexec.h> is
wrapped in CONFIG_KEXEC ifdeffery scope.  That is wrong.  CONFIG_KEXEC
controls the enabling/disabling of kexec_load interface, but not kexec
feature.  Removing the wrongly added CONFIG_KEXEC ifdeffery scope in
<asm/kexec.h> of arm allows us to drop the select KEXEC for CRASH_DUMP.
Meanwhile, change arch/arm/kernel/Makefile to let machine_kexec.o
relocate_kernel.o depend on KEXEC_CORE.

Link: https://lkml.kernel.org/r/20231128054457.659452-1-bhe@redhat.com
Fixes: 89cde45591 ("kexec: consolidate kexec and crash options into kernel/Kconfig.kexec")
Signed-off-by: Baoquan He <bhe@redhat.com>
Reported-by: Ignat Korchagin <ignat@cloudflare.com>
Tested-by: Ignat Korchagin <ignat@cloudflare.com>	[compile-time only]
Tested-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Eric DeVolder <eric_devolder@yahoo.com>
Tested-by: Eric DeVolder <eric_devolder@yahoo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2023-12-13 18:45:19 +01:00
..
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
Makefile kernel/Kconfig.kexec: drop select of KEXEC for CRASH_DUMP 2023-12-13 18:45:19 +01:00
arch_timer.c ARM: 8913/1: arch_timer: include <asm/arch_timer.h> 2019-10-27 21:14:43 +00:00
armksyms.c crypto: lib/sha1 - remove unnecessary includes of linux/cryptohash.h 2020-05-08 15:32:17 +10:00
asm-offsets.c Merge branch 'devel-stable' into for-next 2023-08-14 12:18:06 +01:00
atags.h ARM: 9011/1: centralize phys-to-virt conversion of DT/ATAGS address 2020-10-27 12:10:59 +00:00
atags_compat.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
atags_parse.c ARM: 9300/1: Replace all non-returning strlcpy with strscpy 2023-06-19 09:35:49 +01:00
atags_proc.c proc: remove PDE_DATA() completely 2022-01-22 08:33:37 +02:00
bios32.c PCI: Introduce pci_dev_for_each_resource() 2023-04-04 10:43:52 -05:00
bugs.c ARM: cpu: Switch to arch_cpu_finalize_init() 2023-06-16 10:15:59 +02:00
cpuidle.c ARM: cpuidle: Drop of_device.h include 2023-04-13 17:46:34 -05:00
crash_dump.c vmcore: convert copy_oldmem_page() to take an iov_iter 2022-04-29 14:37:59 -07:00
debug.S ARM: 9005/1: debug: Select flow control for all debug UARTs 2020-09-15 14:35:28 +01:00
devtree.c ARM: make ARCH_MULTIPLATFORM user-visible 2022-08-30 11:18:09 +02:00
dma.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
early_printk.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
efi.c efi: Do not include <linux/screen_info.h> from EFI header 2023-07-08 20:26:36 +02:00
elf.c arm32/64/elf: Split READ_IMPLIES_EXEC from executable PT_GNU_STACK 2020-04-20 19:42:19 +02:00
entry-armv.S Merge branch 'devel-stable' into for-next 2023-08-14 12:18:06 +01:00
entry-common.S ARM: ptrace: Restore syscall restart tracing 2023-08-16 13:58:49 -07:00
entry-ftrace.S ARM: ftrace: enable the graph tracer with the EABI unwinder 2022-02-09 09:13:59 +01:00
entry-header.S context_tracking: Split user tracking Kconfig 2022-06-29 17:04:09 -07:00
entry-v7m.S ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
fiq.c ARM: 9315/1: fiq: include asm/mach/irq.h for prototypes 2023-06-19 09:36:00 +01:00
fiqasm.S
…
ftrace.c ftrace: Remove return value of ftrace_arch_modify_*() 2022-05-26 21:13:00 -04:00
head-common.S ARM: implement THREAD_INFO_IN_TASK for uniprocessor systems 2021-12-06 12:49:17 +01:00
head-inflate-data.c ARM: 9310/1: xip-kernel: add __inflate_kernel_data prototype 2023-06-19 09:35:56 +01:00
head-nommu.S ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
head.S ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
head.h ARM: 9310/1: xip-kernel: add __inflate_kernel_data prototype 2023-06-19 09:35:56 +01:00
hibernate.c ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
hw_breakpoint.c hw_breakpoint: fix single-stepping when using bpf_overflow_handler 2023-08-18 17:04:09 +01:00
hyp-stub.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
insn.c ARM: 9078/1: Add warn suppress parameter to arm_gen_branch_link() 2021-06-07 12:56:20 +01:00
io.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
irq.c asm-generic: Conditionally enable do_softirq_own_stack() via Kconfig. 2022-09-05 17:20:55 +02:00
isa.c arm: simplify two-level sysctl registration for ctl_isa_vars 2023-04-13 11:49:35 -07:00
iwmmxt.S ARM: iwmmxt: Use undef hook to enable coprocessor for task 2023-05-17 15:08:22 +02:00
iwmmxt.h ARM: 9029/1: Make iwmmxt.S support Clang's integrated assembler 2020-12-08 10:14:59 +00:00
jump_label.c jump_label: make initial NOP patching the special case 2022-06-24 09:48:55 +02:00
kgdb.c ARM: Fix kgdb breakpoint for Thumb2 2022-02-21 14:56:53 +00:00
machine_kexec.c ARM: 9317/1: kexec: Make smp stop calls asynchronous 2023-08-14 12:16:59 +01:00
module-plts.c ARM: module: Use module_init_layout_section() to spot init sections 2023-08-03 13:42:02 -07:00
module.c ARM: 9299/1: module: use sign_extend32() to extend the signedness 2023-06-19 09:35:48 +01:00
opcodes.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
paravirt.c x86/paravirt: Switch time pvops functions to use static_call() 2021-03-11 16:17:52 +01:00
patch.c arm/patch: Fix !MMU compile 2020-02-11 12:56:27 +01:00
perf_callchain.c ARM: 9258/1: stacktrace: Make stack walk callback consistent with generic code 2022-11-08 18:36:18 +00:00
perf_event_v6.c arm_pmu: Tidy up clear_event_idx call backs 2018-07-10 18:19:02 +01:00
perf_event_v7.c arm_pmu: Fix write counter incorrect in ARMv7 big-endian mode 2021-06-01 14:17:01 +01:00
perf_event_xscale.c arm_pmu: Tidy up clear_event_idx call backs 2018-07-10 18:19:02 +01:00
perf_regs.c perf/arch: Remove perf_sample_data::regs_user_copy 2020-11-09 18:12:34 +01:00
phys2virt.S ARM: p2v: reduce p2v alignment requirement to 2 MiB 2020-10-28 16:59:43 +01:00
pj4-cp0.c ARM: iwmmxt: Use undef hook to enable coprocessor for task 2023-05-17 15:08:22 +02:00
process.c ARM: kernel: Get rid of thread_info::used_cp[] array 2023-05-17 15:08:22 +02:00
psci_smp.c ARM: 8919/1: make unexported functions static 2019-10-31 16:58:52 +00:00
ptrace.c ARM updates for v6.6-rc1 2023-08-31 12:49:10 -07:00
reboot.c ARM: 9219/1: fix undeclared soft_restart 2022-07-28 15:09:17 +01:00
reboot.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
relocate_kernel.S ARM: kexec: fix oops after TLB are invalidated 2021-02-05 10:23:29 +00:00
return_address.c ARM: 9258/1: stacktrace: Make stack walk callback consistent with generic code 2022-11-08 18:36:18 +00:00
setup.c ARM: 9308/1: move setup functions to header 2023-06-19 09:35:55 +01:00
signal.c x86/shstk: Add user control-protection fault handler 2023-08-02 15:01:50 -07:00
signal.h ARM: 8920/1: share get_signal_page from signal.c to process.c 2019-10-31 16:58:53 +00:00
sigreturn_codes.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
sleep.S ARM: mm: switch to swapper_pg_dir early for vmap'ed stack 2022-01-24 20:37:55 +01:00
smccc-call.S ARM: 9075/1: kernel: Fix interrupted SMC calls 2021-04-18 19:15:14 +01:00
smp.c nmi_backtrace: allow excluding an arbitrary CPU 2023-08-18 10:19:00 -07:00
smp_scu.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
smp_tlb.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
smp_twd.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
spectre.c ARM: fix build error when BPF_SYSCALL is disabled 2022-03-08 12:53:05 -08:00
stacktrace.c ARM: 9259/1: stacktrace: Convert stacktrace to generic ARCH_STACKWALK 2022-11-14 12:00:57 +00:00
suspend.c ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
swp_emulate.c ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
sys_arm.c ARM: 9309/1: add missing syscall prototypes 2023-06-19 09:35:55 +01:00
sys_oabi-compat.c ARM: 9309/1: add missing syscall prototypes 2023-06-19 09:35:55 +01:00
tcm.c ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
thumbee.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
time.c ARM: rpc: use legacy_timer_tick 2020-10-30 21:57:05 +01:00
topology.c ARM, sched/topology: Revert back to default scheduler topology 2020-08-19 10:49:47 +02:00
traps.c ARM: 9302/1: traps: hide unused functions on NOMMU 2023-06-19 09:35:50 +01:00
unwind.c ARM: 9295/1: unwind:fix unwind abort for uleb128 case 2023-05-05 10:16:40 +01:00
v7m.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
vdso.c ARM: 9300/1: Replace all non-returning strlcpy with strscpy 2023-06-19 09:35:49 +01:00
vmlinux-xip.lds.S ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
vmlinux.lds.S ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
xscale-cp0.c ARM: iwmmxt: Use undef hook to enable coprocessor for task 2023-05-17 15:08:22 +02:00