linux-kernel - Re: [PATCH] mips: vmcore: forced convert 'hdr' in elf_check

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Date:	Mon, 21 Sep 2015 10:16:22 +0800
From:	yjin <yanjiang.jin@...driver.com>
To:	<ralf@...ux-mips.org>
CC:	<akpm@...ux-foundation.org>, <mhuang@...hat.com>,
	<kexec@...ts.infradead.org>, <chaowang@...hat.com>,
	<linux-kernel@...r.kernel.org>, <jinyanjiang@...il.com>,
	<linux-mips@...ux-mips.org>
Subject: Re: [PATCH] mips: vmcore: forced convert 'hdr' in elf_check_arch()

The new version patch only modifies mips/elf.h, so add Ralf Baechle and 
cc linux-mips@...ux-mips.org.
This is a V2 patch, attach the V1 patch for reference.

Thanks!
Yanjiang

On 2015年09月18日 15:42, yanjiang.jin@...driver.com wrote:
> From: Yanjiang Jin <yanjiang.jin@...driver.com>
>
> elf_check_arch() will be called both in parse_crash_elf64_headers()
> and parse_crash_elf32_headers(). But in these two functions, the type of
> the parameter ehdr is different: Elf32_Ehdr and Elf64_Ehdr.
>
> Function parse_crash_elf_headers() reads e_ident[EI_CLASS] then decides to
> call parse_crash_elf64_headers() or parse_crash_elf32_headers().
> This happens in run time, not compile time. So compiler will report
> the below warning:
>
> In file included from include/linux/elf.h:4:0,
>                   from fs/proc/vmcore.c:13:
> fs/proc/vmcore.c: In function 'parse_crash_elf32_headers':
> arch/mips/include/asm/elf.h:258:23: warning: initializatio
> n from incompatible pointer type
>    struct elfhdr *__h = (hdr);     \
>                         ^
> fs/proc/vmcore.c:1071:4: note: in expansion of macro 'elf_
> check_arch'
>     !elf_check_arch(&ehdr) ||
>      ^
>
> Signed-off-by: Yanjiang Jin <yanjiang.jin@...driver.com>
> ---
>   arch/mips/include/asm/elf.h | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/mips/include/asm/elf.h b/arch/mips/include/asm/elf.h
> index f19e890..ece490d 100644
> --- a/arch/mips/include/asm/elf.h
> +++ b/arch/mips/include/asm/elf.h
> @@ -224,7 +224,7 @@ struct mips_elf_abiflags_v0 {
>   #define elf_check_arch(hdr)						\
>   ({									\
>   	int __res = 1;							\
> -	struct elfhdr *__h = (hdr);					\
> +	struct elfhdr *__h = (struct elfhdr *)(hdr);			\
>   									\
>   	if (__h->e_machine != EM_MIPS)					\
>   		__res = 0;						\
> @@ -255,7 +255,7 @@ struct mips_elf_abiflags_v0 {
>   #define elf_check_arch(hdr)						\
>   ({									\
>   	int __res = 1;							\
> -	struct elfhdr *__h = (hdr);					\
> +	struct elfhdr *__h = (struct elfhdr *)(hdr);			\
>   									\
>   	if (__h->e_machine != EM_MIPS)					\
>   		__res = 0;						\


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