linux-kernel - Re: [PATCH v14 06/11] x86/elf: Move vmcore_elf_check_arch

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Message-ID: <20210218062508.GH2871@MiWiFi-R3L-srv>
Date:   Thu, 18 Feb 2021 14:31:19 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Chen Zhou <chenzhou10@...wei.com>
Cc:     mingo@...hat.com, tglx@...utronix.de, rppt@...nel.org,
        dyoung@...hat.com, catalin.marinas@....com, will@...nel.org,
        nsaenzjulienne@...e.de, corbet@....net, John.P.donnelly@...cle.com,
        prabhakar.pkin@...il.com, horms@...ge.net.au, robh+dt@...nel.org,
        arnd@...db.de, james.morse@....com, xiexiuqi@...wei.com,
        guohanjun@...wei.com, huawei.libin@...wei.com,
        wangkefeng.wang@...wei.com, linux-doc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kexec@...ts.infradead.org, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v14 06/11] x86/elf: Move vmcore_elf_check_arch_cross to
 arch/x86/include/asm/elf.h

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

> Reported-by: kernel test robot <lkp@...el.com>
> Suggested-by: Mike Rapoport <rppt@...nel.org>
> Signed-off-by: Chen Zhou <chenzhou10@...wei.com>
> ---
>  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
>