linux-kernel - Re: [Bug 10732] REGRESSION: 2.6.26-rc2-git4: X server failed start onX61s laptop

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Date:	Sat, 17 May 2008 20:32:38 +0200
From:	Gabriel C <nix.or.die@...glemail.com>
To:	Keith Packard <keithp@...thp.com>
CC:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Eric Anholt <eric@...olt.net>, Theodore Tso <tytso@....edu>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	bugme-daemon@...zilla.kernel.org, airlied@...ux.ie,
	"Barnes, Jesse" <jesse.barnes@...el.com>
Subject: Re: [Bug 10732] REGRESSION: 2.6.26-rc2-git4: X server failed start
 onX61s laptop

Keith Packard wrote:

> On Sat, 2008-05-17 at 09:02 -0700, Pallipadi, Venkatesh wrote:
> 
>> I am thinking that may be X is depending on mprotect changes somehow and
>> failing when
>> it cannot change PAT attributes with mprotect call. Keith earlier
>> mentioned that X
>> will not depend on this. May be something to do with earlier X version.
>> Keith?
> 
> It looks like we can turn off read/write access, but we can't turn it
> back on. So,
> 
>         mprotect (map->memory, map->size, PROT_NONE);
>         mprotect (map->memory, map->size, PROT_READ|PROT_WRITE);
>  
> leaves the memory with no access.
> 
> Eric saw this last week; I don't know whether he debugged into it
> further.
> 
> Which repository is commit 1c12c4cf in?


It is in linus-git tree , http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=1c12c4cf9411eb130b245fa8d0fbbaf989477c7b


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