From: Davidlohr Bueso <dave@stgolabs.net>
To: Chris Wilson <chris@chris-wilson.co.uk>
Cc: linux-kernel@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Daniel Vetter <daniel.vetter@ffwll.ch>
Subject: Re: [PATCH] mutex: Always clear owner field upon mutex_unlock()
Date: Tue, 06 Jan 2015 08:43:34 -0800 [thread overview]
Message-ID: <1420562614.24290.5.camel@stgolabs.net> (raw)
In-Reply-To: <1420540175-30204-1-git-send-email-chris@chris-wilson.co.uk>
On Tue, 2015-01-06 at 10:29 +0000, Chris Wilson wrote:
> Currently if DEBUG_MUTEXES is enabled, the mutex->owner field is only
> cleared iff debug_locks is active. This exposes a race to other users of
> the field where the mutex->owner may be still set to a stale value,
> potentially upsetting mutex_spin_on_owner() among others.
>
> References: https://bugs.freedesktop.org/show_bug.cgi?id=87955
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Davidlohr Bueso <dave@stgolabs.net>
next prev parent reply other threads:[~2015-01-06 16:43 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-06 10:29 Chris Wilson
2015-01-06 11:34 ` Peter Zijlstra
2015-01-06 16:43 ` Davidlohr Bueso [this message]
2015-01-09 12:34 ` [tip:locking/urgent] " tip-bot for Chris Wilson
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