linux-kernel - Re: [PATCH 6/6] futex: cleanup fault logic

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Message-ID: <49B9259B.4030308@us.ibm.com>
Date:	Thu, 12 Mar 2009 08:09:15 -0700
From:	Darren Hart <dvhltc@...ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH 6/6] futex: cleanup fault logic

Peter Zijlstra wrote:
> On Thu, 2009-03-12 at 00:56 -0700, Darren Hart wrote:
>> Older versions of the futex code held the mmap_sem which had to be
>> dropped in order to call get_user(), so a two-pronged fault handling
>> mechanism was employed to handle faults of the atomic operations.  The
>> mmap_sem is no longer held, so get_user() should be adequate.  This patch
>> greatly simplifies the logic and improves legibility.
> 
> Thanks!

And I should have added a credit to Peter to helping me untangle it all 
and decide how to proceed with this patch.  Thanks Peter.


-- 
Darren Hart
IBM Linux Technology Center
Real-Time Linux Team
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