linux-kernel - Re: [PATCH -mm 2/6] Freezer: Fix memory ordering in refrigerator

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Message-ID: <20070226113220.GC164@tv-sign.ru>
Date:	Mon, 26 Feb 2007 14:32:20 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Andrew Morton <akpm@...l.org>, Pavel Machek <pavel@....cz>,
	LKML <linux-kernel@...r.kernel.org>,
	Aneesh Kumar <aneesh.kumar@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>
Subject: Re: [PATCH -mm 2/6] Freezer: Fix memory ordering in refrigerator

On 02/26, Rafael J. Wysocki wrote:
>
> From: Oleg Nesterov <oleg@...sign.ru>
> 
> refrigerator() can miss a wakeup, "wait event" loop needs a proper memory
> ordering.
> 
> Signed-off-by: Oleg Nesterov <oleg@...sign.ru>
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> Acked-by: Pavel Machek <pavel@....cz>
> ---
>  kernel/power/process.c |    6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> Index: linux-2.6.20-mm2/kernel/power/process.c
> ===================================================================
> --- linux-2.6.20-mm2.orig/kernel/power/process.c
> +++ linux-2.6.20-mm2/kernel/power/process.c
> @@ -47,8 +47,10 @@ void refrigerator(void)
>  	recalc_sigpending(); /* We sent fake signal, clean it up */
>  	spin_unlock_irq(&current->sighand->siglock);
>  
> -	while (frozen(current)) {
> -		current->state = TASK_UNINTERRUPTIBLE;
> +	for (;;) {
> +		set_current_state(TASK_UNINTERRUPTIBLE);
> +		if (!frozen(current))
> +			break;
>  		schedule();
>  	}
>  	pr_debug("%s left refrigerator\n", current->comm);

This one is already in -mm tree.

Oleg.

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