linux-kernel - Re: [RFC][PATCH -mm] Freezer: Do not allow freezing processes to clear TIF

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Message-Id: <200710190809.03042.nigel@nigel.suspend2.net>
Date:	Fri, 19 Oct 2007 08:09:02 +1000
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...sign.ru>, Pavel Machek <pavel@....cz>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [RFC][PATCH -mm] Freezer: Do not allow freezing processes to clear TIF_SIGPENDING

Hi.

On Friday 19 October 2007 08:22:35 Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> Do not allow processes to clear their TIF_SIGPENDING if TIF_FREEZE is set,
> to prevent them from racing with the freezer (like mysqld does, for 
example).
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>

Acked-by: Nigel Cunningham <nigel@...pend2.net>

> ---
>  kernel/signal.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux-2.6.23-mm1/kernel/signal.c
> ===================================================================
> --- linux-2.6.23-mm1.orig/kernel/signal.c
> +++ linux-2.6.23-mm1/kernel/signal.c
> @@ -124,7 +124,7 @@ void recalc_sigpending_and_wake(struct t
>  
>  void recalc_sigpending(void)
>  {
> -	if (!recalc_sigpending_tsk(current))
> +	if (!recalc_sigpending_tsk(current) && !freezing(current))
>  		clear_thread_flag(TIF_SIGPENDING);
>  
>  }
> 



-- 
Nigel, Michelle, Alisdair and ____________ Cunningham
5 Mitchell Street
Cobden 3266
Victoria, Australia
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