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

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Message-ID: <20061106141502.GA164@oleg>
Date:	Mon, 6 Nov 2006 17:15:02 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...l.org>,
	Linus Torvalds <torvalds@...l.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: PATCH? hrtimer_wakeup: fix a theoretical race wrt rt_mutex_slowlock()

On 11/06, Steven Rostedt wrote:
> 
> Acked-by: Steven Rostedt <rostedt@...dmis.org>

Thanks.

But on the other hand we probably have a similar code (set condition +
wake_up_process()) in other places too, and __wake_up(wait_queue_head_t)
has (in theory) the same problem. Probably we can add something like

	smp_wmb_unless_spin_lock_implies_memory_barrier_on_this_arch()

somewhere in try_to_wake_up(). I dunno.

Oleg.

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