linux-kernel - Re: [Patch 2/3] elf: clean up fill_note

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Date:	Wed, 1 Jul 2009 12:29:55 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Amerigo Wang <amwang@...hat.com>
Cc:	linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk,
	roland@...hat.com, serue@...ibm.com, dhowells@...hat.com,
	amwang@...hat.com, jmorris@...ei.org, linux-fsdevel@...r.kernel.org
Subject: Re: [Patch 2/3] elf: clean up fill_note_info()

On Wed, 1 Jul 2009 01:06:36 -0400
Amerigo Wang <amwang@...hat.com> wrote:

> +#define	NUM_NOTES	6
>  	info->notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote),
>  			      GFP_KERNEL);
> +#undef NUM_NOTES

That #define amounts to a really perverse code comment.

How about we do this?

--- a/fs/binfmt_elf.c~elf-clean-up-fill_note_info-fix
+++ a/fs/binfmt_elf.c
@@ -1719,10 +1719,8 @@ static int elf_note_info_init(struct elf
 	memset(info, 0, sizeof(*info));
 	INIT_LIST_HEAD(&info->thread_list);
 
-#define	NUM_NOTES	6
-	info->notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote),
-			      GFP_KERNEL);
-#undef NUM_NOTES
+	/* Allocate space for six ELF notes */
+	info->notes = kmalloc(6 * sizeof(struct memelfnote), GFP_KERNEL);
 	if (!info->notes)
 		return 0;
 	info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL);
_

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