linux-kernel - Re: [PATCH 02 of 11] get_task

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Message-ID: <20080507155948.GO18857@sgi.com>
Date:	Wed, 7 May 2008 10:59:48 -0500
From:	Robin Holt <holt@....com>
To:	Andrea Arcangeli <andrea@...ranet.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <clameter@....com>,
	Jack Steiner <steiner@....com>, Robin Holt <holt@....com>,
	Nick Piggin <npiggin@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	kvm-devel@...ts.sourceforge.net,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	Roland Dreier <rdreier@...co.com>,
	Steve Wise <swise@...ngridcomputing.com>,
	linux-kernel@...r.kernel.org, Avi Kivity <avi@...ranet.com>,
	linux-mm@...ck.org, general@...ts.openfabrics.org,
	Hugh Dickins <hugh@...itas.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Anthony Liguori <aliguori@...ibm.com>,
	Chris Wright <chrisw@...hat.com>,
	Marcelo Tosatti <marcelo@...ck.org>,
	Eric Dumazet <dada1@...mosbay.com>,
	"Paul E. McKenney" <paulmck@...ibm.com>
Subject: Re: [PATCH 02 of 11] get_task_mm

You can drop this patch.

This turned out to be a race in xpmem.  It "appeared" as if it were a
race in get_task_mm, but it really is not.  The current->mm field is
cleared under the task_lock and the task_lock is grabbed by get_task_mm.

I have been testing you v15 version without this patch and not
encountere the problem again (now that I fixed my xpmem race).

Thanks,
Robin

On Wed, May 07, 2008 at 04:35:52PM +0200, Andrea Arcangeli wrote:
> # HG changeset patch
> # User Andrea Arcangeli <andrea@...ranet.com>
> # Date 1210115127 -7200
> # Node ID c5badbefeee07518d9d1acca13e94c981420317c
> # Parent  e20917dcc8284b6a07cfcced13dda4cbca850a9c
> get_task_mm
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