linux-kernel - Re: PATCH? hrtimer_wakeup: fix a theoretical race wrt rt_mutex

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Message-Id: <1162846433.28571.341.camel@localhost.localdomain>
Date:	Tue, 07 Nov 2006 07:53:53 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Linus Torvalds <torvalds@...l.org>,
	Oleg Nesterov <oleg@...sign.ru>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: PATCH? hrtimer_wakeup: fix a theoretical race wrt
	rt_mutex_slowlock()

On Mon, 2006-11-06 at 07:35 -0500, Steven Rostedt wrote:

> It is relevant.  In powerpc, can one write happen before another write?
> 
> 
>   x = 1;
>   barrier();  (only compiler barrier)
>   b = 2;
> 
> 
> And have CPU 2 see b=2 before seeing x=1?

Yes. Definitely.

> If so, then I guess this is indeed a bug on powerpc.

Ben.


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