linux-kernel - Re: [(RT RFC) PATCH v2 3/9] rearrange rt_spin

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Date:	Mon, 25 Feb 2008 22:54:54 +0100
From:	Pavel Machek <pavel@....cz>
To:	Gregory Haskins <ghaskins@...ell.com>
Cc:	mingo@...e.hu, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	rostedt@...dmis.org, linux-rt-users@...r.kernel.org,
	linux-kernel@...r.kernel.org, bill.huey@...il.com,
	kevin@...man.org, cminyard@...sta.com, dsingleton@...sta.com,
	dwalker@...sta.com, npiggin@...e.de, dsaxena@...xity.net,
	ak@...e.de, acme@...hat.com, gregkh@...e.de, sdietrich@...ell.com,
	pmorreale@...ell.com, mkohari@...ell.com
Subject: Re: [(RT RFC) PATCH v2 3/9] rearrange rt_spin_lock sleep

Hi!

> @@ -720,7 +728,8 @@ rt_spin_lock_slowlock(struct rt_mutex *lock)
>  	 * saved_state accordingly. If we did not get a real wakeup
>  	 * then we return with the saved state.
>  	 */
> -	saved_state = xchg(&current->state, TASK_UNINTERRUPTIBLE);
> +	saved_state = current->state;
> +	smp_mb();
>  
>  	for (;;) {
>  		unsigned long saved_flags;

Please document what the barrier is good for.

Plus, you are replacing atomic operation with nonatomic; is that ok?

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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