linux-kernel - Re: [PATCH] mutex: Fix mutex_can_spin_on

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Message-ID: <51E9954C.9000405@redhat.com>
Date:	Fri, 19 Jul 2013 15:36:44 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Waiman Long <Waiman.Long@...com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mutex: Fix mutex_can_spin_on_owner

On 07/19/2013 02:31 PM, Peter Zijlstra wrote:
>
> mutex_can_spin_on_owner() is broken in that it would allow the compiler
> to load lock->owner twice, seeing a pointer first time and a MULL
> pointer the second time.
>
> Signed-off-by: Peter Zijlstra <peterz@...radead.org>

Reviewed-by: Rik van Riel <riel@...hat.com>

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