linux-kernel - Re: [PATCH v7 2/8] vmcore: allocate buffer for ELF headers on page-size alignment

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Message-ID: <20130522140142.GD5332@redhat.com>
Date:	Wed, 22 May 2013 10:01:42 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
Cc:	ebiederm@...ssion.com, akpm@...ux-foundation.org, cpw@....com,
	kumagai-atsushi@....nes.nec.co.jp, lisa.mitchell@...com,
	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
	zhangyanfei@...fujitsu.com, jingbai.ma@...com, linux-mm@...ck.org,
	riel@...hat.com, walken@...gle.com, hughd@...gle.com,
	kosaki.motohiro@...fujitsu.com
Subject: Re: [PATCH v7 2/8] vmcore: allocate buffer for ELF headers on
 page-size alignment

On Wed, May 22, 2013 at 11:55:43AM +0900, HATAYAMA Daisuke wrote:

[..]
>  /* Sets offset fields of vmcore elements. */
> -static void __init set_vmcore_list_offsets_elf64(char *elfptr,
> +static void __init set_vmcore_list_offsets_elf64(char *elfptr, size_t elfsz,
>  						struct list_head *vc_list)
>  {
>  	loff_t vmcore_off;
> @@ -469,8 +472,7 @@ static void __init set_vmcore_list_offsets_elf64(char *elfptr,
>  	ehdr_ptr = (Elf64_Ehdr *)elfptr;
>  
>  	/* Skip Elf header and program headers. */
> -	vmcore_off = sizeof(Elf64_Ehdr) +
> -			(ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr);
> +	vmcore_off = elfsz;

As you are passing in size of elf headers, I think some of the code
has become redundant in this function. (ehdr_ptr = (Elf64_Ehdr *)elfptr;).
We can remove it and now we should be able to merge
set_vmcore_list_offsets_elf32() and set_vmcore_list_offsets_elf64()
functions.

Vivek
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