linux-kernel - Re: [PATCH] oprofile: vma_map: fix test on overlay_tbl

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Message-ID: <480F3BB0.9080507@us.ibm.com>
Date:	Wed, 23 Apr 2008 08:37:52 -0500
From:	Maynard Johnson <maynardj@...ibm.com>
To:	Roel Kluin <12o3l@...cali.nl>, arnd@...db.de
CC:	phil.el@...adoo.fr, oprofile-list@...ts.sf.net,
	lkml <linux-kernel@...r.kernel.org>, Carl Love <cel@...ibm.com>,
	Bob Nelson <rrnelson@...ux.vnet.ibm.com>
Subject: Re: [PATCH] oprofile: vma_map: fix test on overlay_tbl_offset

Roel Kluin wrote:
> Offset is unsigned and when an address isn't found in the vma map
> vma_map_lookup() returns the vma physical address + 0x10000000.
>
> Signed-off-by: Roel Kluin <12o3l@...cali.nl>
>   
Patch looks correct.  vma_map_lookup used to return 0xffffffff on a 
failed lookup, but a change was recently made to return the vma physical 
address + 0x10000000 (as Roel notes above).  There are two callers of 
vam_map_lookup: one of them correctly deals with this new return value, 
but the other (below) did not.  Roel's patch fixes that hole.  Thanks!

Arnd, can you put this into the Cell tree for pushing upstream?  Thanks.

-Maynard
> ---
> diff --git a/arch/powerpc/oprofile/cell/vma_map.c b/arch/powerpc/oprofile/cell/vma_map.c
> index 9a93217..1c28e2e 100644
> --- a/arch/powerpc/oprofile/cell/vma_map.c
> +++ b/arch/powerpc/oprofile/cell/vma_map.c
> @@ -229,7 +229,7 @@ struct vma_to_fileoffset_map *create_vma_map(const struct spu *aSpu,
>  	 */
>  	overlay_tbl_offset = vma_map_lookup(map, ovly_table_sym,
>  					    aSpu, &grd_val);
> -	if (overlay_tbl_offset < 0) {
> +	if (overlay_tbl_offset >= 0x10000000) {
>  		printk(KERN_ERR "SPU_PROF: "
>  		       "%s, line %d: Error finding SPU overlay table\n",
>  		       __FUNCTION__, __LINE__);
>
>
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