linux-kernel - Re: BUG: failure at mm/nommu.c:518/add_nommu

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Message-ID: <4A0227AD.9030705@snapgear.com>
Date:	Thu, 07 May 2009 10:13:33 +1000
From:	Greg Ungerer <gerg@...pgear.com>
To:	David Howells <dhowells@...hat.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: BUG: failure at mm/nommu.c:518/add_nommu_region()

Hi David,

David Howells wrote:
> Can you try the attached patch, please?

Yes, that fixes it :-)

Regards
Greg


> ---
> From: David Howells <dhowells@...hat.com>
> Subject: [PATCH] NOMMU: Don't check vm_region::vm_start is page aligned in add_nommu_region()
> 
> Don't check vm_region::vm_start is page aligned in add_nommu_region() because
> the region may reflect some non-page-aligned mapped file, such as could be
> obtained from RomFS XIP.
> 
> Signed-off-by: David Howells <dhowells@...hat.com>
> ---
> 
>  mm/nommu.c |    2 --
>  1 files changed, 0 insertions(+), 2 deletions(-)
> 
> 
> diff --git a/mm/nommu.c b/mm/nommu.c
> index cdc6f60..325706b 100644
> --- a/mm/nommu.c
> +++ b/mm/nommu.c
> @@ -515,8 +515,6 @@ static void add_nommu_region(struct vm_region *region)
>  
>  	validate_nommu_regions();
>  
> -	BUG_ON(region->vm_start & ~PAGE_MASK);
> -
>  	parent = NULL;
>  	p = &nommu_region_tree.rb_node;
>  	while (*p) {
> 

-- 
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Greg Ungerer  --  Principal Engineer        EMAIL:     gerg@...pgear.com
SnapGear Group, McAfee                      PHONE:       +61 7 3435 2888
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