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Date:	Sat, 4 Jan 2014 13:48:19 -0500
From:	John David Anglin <>
To:	Mikulas Patocka <>
CC:	Joonsoo Kim <>,
	Andi Kleen <>,
	Christoph Lameter <>,
	Pekka Enberg <>,,
Subject: Re: [PATCH] fix crash when using XFS on loopback

On 4-Jan-14, at 12:45 PM, Mikulas Patocka wrote:

> * flush_dcache_page asks for the list of userspace mappings, however  
> that
>  page->mapping field is reused by the slab subsystem for a different
>  purpose. This causes the crash.

I'd noticed the other day that the parisc implementation of  
should return if "!mapping || mapping != page->mapping" is true.  This  
have avoided crash.

John David Anglin

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