linux-kernel - Re: [PATCH] vmcore: replace Elf64_Ehdr/Elf32

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Date:	Wed, 16 Sep 2015 18:39:17 +0800
From:	Minfei Huang <mhuang@...hat.com>
To:	yanjiang.jin@...driver.com
Cc:	akpm@...ux-foundation.org, chaowang@...hat.com,
	linux-kernel@...r.kernel.org, jinyanjiang@...il.com
Subject: Re: [PATCH] vmcore: replace Elf64_Ehdr/Elf32_Ehdr with elfhdr

On 09/16/15 at 10:58am, yanjiang.jin@...driver.com wrote:
> From: Yanjiang Jin <yanjiang.jin@...driver.com>
> 
> Function parse_crash_elf_headers() reads e_ident[EI_CLASS] then decides to
> call parse_crash_elf64_headers() or parse_crash_elf32_headers().
> But 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);     \
>                        ^

How about converting the hdr to type elfhdr in above sentence, like
following.

struct elfhdr *__h = (struct elfhdr *)(hdr);

Thanks
Minfei

> 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>
> ---
>  fs/proc/vmcore.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
> index 4e61388..576bb26 100644
> --- a/fs/proc/vmcore.c
> +++ b/fs/proc/vmcore.c
> @@ -999,7 +999,7 @@ static void free_elfcorebuf(void)
>  static int __init parse_crash_elf64_headers(void)
>  {
>  	int rc=0;
> -	Elf64_Ehdr ehdr;
> +	struct elfhdr ehdr;
>  	u64 addr;
>  
>  	addr = elfcorehdr_addr;
> @@ -1055,7 +1055,7 @@ fail:
>  static int __init parse_crash_elf32_headers(void)
>  {
>  	int rc=0;
> -	Elf32_Ehdr ehdr;
> +	struct elfhdr ehdr;
>  	u64 addr;
>  
>  	addr = elfcorehdr_addr;
--
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