linux-kernel - Re: Lockless/Get_User_Pages_Fast causes Xorg 1.4.99.* to lock

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Date:	Mon, 7 Jul 2008 13:08:53 +0200
From:	"Martin Schwidefsky" <schwidefsky@...glemail.com>
To:	"Hugh Dickins" <hugh@...itas.com>
Cc:	"Nick Piggin" <nickpiggin@...oo.com.au>, benh@...nel.crashing.org,
	cotte@...ibm.com, "Zan Lynx" <zlynx@....org>,
	"Ryan Hope" <rmh3093@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: Lockless/Get_User_Pages_Fast causes Xorg 1.4.99.* to lock

On Mon, Jul 7, 2008 at 12:39 PM, Hugh Dickins <hugh@...itas.com> wrote:
> On Mon, 7 Jul 2008, Nick Piggin wrote:
>>
>> I think we need a similar fix for s390 too. If so, then it really should
>> get into 2.6.26, but this late in the release, I hope an s390 maintainer
>> might be able to test and verify the fix?
>
> Wow, yes, I hadn't realized s390 is ahead of the game there: glad you're
> back to spot that.  But yes, we'd prefer maintainer to confirm and push.
>
>
> [PATCH]] s390: protect _PAGE_SPECIAL bit against mprotect
>
> Stop mprotect's pte_modify from wiping out the s390 pte_special bit, which
> caused oops thereafter when vm_normal_page thought X's abnormal was normal.
>
> Signed-off-by: Nick Piggin <npiggin@...e.de>
> Acked-by: Hugh Dickins <hugh@...itas.com>

s390 will definitely need this. Loosing the pte special bit is not
good. I'll prepate
a please pull right away. Thanks of pointing this out.

-- 
blue skies,
 Martin
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