linux-kernel - Re: [PATCH 1/1] PM: Thaws refrigerated and to be exited kernel threads

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Message-ID: <20091107165421.GA1630@ucw.cz>
Date:	Sat, 7 Nov 2009 17:54:21 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Dasgupta, Romit" <romit@...com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...ts.linux-foundation.org" 
	<linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH 1/1] PM: Thaws refrigerated and to be exited kernel
	threads

Hi!

> Kicks out a frozen thread from the refrigerator when an active thread has
> invoked kthread_stop on the frozen thread.
> 
> Signed-off-by: Romit Dasgupta <romit@...com>
> ---
> 
> diff --git a/kernel/freezer.c b/kernel/freezer.c
> index bd1d42b..c28dbe8 100644
> --- a/kernel/freezer.c
> +++ b/kernel/freezer.c
> @@ -9,6 +9,7 @@
>  #include <linux/module.h>
>  #include <linux/syscalls.h>
>  #include <linux/freezer.h>
> +#include <linux/kthread.h>
>  
>  /*
>   * freezing is complete, mark current process as frozen
> @@ -49,7 +50,7 @@ void refrigerator(void)
>  
>  	for (;;) {
>  		set_current_state(TASK_UNINTERRUPTIBLE);
> -		if (!frozen(current))
> +		if (!frozen(current) || (!current->mm && kthread_should_stop()))
>  			break;
>  		schedule();

Well, what if the thread does some processing before stopping? That
would break refrigerator assumptions...
								Pavel

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