linux-kernel - Re: [PATCH] mutex: Always clear owner field upon mutex

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Message-ID: <20150106113420.GR29390@twins.programming.kicks-ass.net>
Date:	Tue, 6 Jan 2015 12:34:20 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: Re: [PATCH] mutex: Always clear owner field upon mutex_unlock()

On Tue, Jan 06, 2015 at 10:29:35AM +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.


Thanks
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