Re: [PATCH v14 06/11] x86/elf: Move vmcore_elf_check_arch_cross to arch/x86/include/asm/elf.h

On 2021/2/18 14:31, Baoquan He wrote:

On 01/30/21 at 03:10pm, Chen Zhou wrote:

quoted

Move macro vmcore_elf_check_arch_cross from arch/x86/include/asm/kexec.h
to arch/x86/include/asm/elf.h to fix the following compiling warning:

make ARCH=i386
In file included from arch/x86/kernel/setup.c:39:0:
./arch/x86/include/asm/kexec.h:77:0: warning: "vmcore_elf_check_arch_cross" redefined
 # define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64)

In file included from arch/x86/kernel/setup.c:9:0:
./include/linux/crash_dump.h:39:0: note: this is the location of the previous definition
 #define vmcore_elf_check_arch_cross(x) 0

The root cause is that vmcore_elf_check_arch_cross under CONFIG_CRASH_CORE
depend on CONFIG_KEXEC_CORE. Commit 2db65f1db17d ("x86: kdump: move
reserve_crashkernel[_low]() into crash_core.c") triggered the issue.

Suggested by Mike, simply move vmcore_elf_check_arch_cross from
arch/x86/include/asm/kexec.h to arch/x86/include/asm/elf.h to fix
the warning.

Fixes: 2db65f1db17d ("x86: kdump: move reserve_crashkernel[_low]() into crash_core.c")

Where does this commit id '2db65f1db17d' come from? Here you are fixing
another pathc in the same patchset. Please merge this with patch 05/11.

Yeah, the commit id is invalid, i will merge this patch with patch 05/11.

Thanks,
Chen Zhou

quoted

Reported-by: kernel test robot <redacted>
Suggested-by: Mike Rapoport <rppt@kernel.org>
Signed-off-by: Chen Zhou <redacted>
---
 arch/x86/include/asm/elf.h   | 3 +++
 arch/x86/include/asm/kexec.h | 3 ---
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h
index 66bdfe838d61..5333777cc758 100644
--- a/arch/x86/include/asm/elf.h
+++ b/arch/x86/include/asm/elf.h

@@ -94,6 +94,9 @@ extern unsigned int vdso32_enabled;
 
 #define elf_check_arch(x)	elf_check_arch_ia32(x)
 
+/* We can also handle crash dumps from 64 bit kernel. */
+# define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64)
+
 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx
    contains a pointer to a function which might be registered using `atexit'.
    This provides a mean for the dynamic linker to call DT_FINI functions for

diff --git a/arch/x86/include/asm/kexec.h b/arch/x86/include/asm/kexec.h
index 2b18f918203e..6fcae01a9cca 100644
--- a/arch/x86/include/asm/kexec.h
+++ b/arch/x86/include/asm/kexec.h

@@ -72,9 +72,6 @@ struct kimage;
 
 /* The native architecture */
 # define KEXEC_ARCH KEXEC_ARCH_386
-
-/* We can also handle crash dumps from 64 bit kernel. */
-# define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64)
 #else
 /* Maximum physical address we can use pages from */
 # define KEXEC_SOURCE_MEMORY_LIMIT      (MAXMEM-1)

-- 
2.20.1

.

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