linux-kernel - Re: [PATCH 2/4] swsusp: Untangle freeze

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Date:	Sun, 19 Nov 2006 03:09:26 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Andrew Morton <akpm@...l.org>, LKML <linux-kernel@...r.kernel.org>,
	Nigel Cunningham <ncunningham@...uxmail.org>
Subject: Re: [PATCH 2/4] swsusp: Untangle freeze_processes

Hi!

> Move the loop from freeze_processes() to a separate function and call it
> independently for user space processes and kernel threads so that the order of
> freezing tasks is clearly visible.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> ---
>  kernel/power/process.c |   88 ++++++++++++++++++++++++++++++++-----------------
>  1 file changed, 58 insertions(+), 30 deletions(-)
>

>  		do_each_thread(g, p) {
> +			if (is_user_space(p)) {
> +				if(!freeze_user_space)
> +					continue;
> +			} else {
> +				if(freeze_user_space)
> +					continue;
> +			}

Needs space between if and (, but lets use if (is_user_space() !=
freeze_user_space) trick here, too. 

> +/**
> + *	freeze_processes - tell processes to enter the refrigerator
> + *
> + *	Returns 0 on success, or the number of processes that didn't freeze,
> + *	although they were told to.
> + */

Above you point out to the broken calling convention. Perhaps this is
great time to fix it, too? Hmm, or maybe not. Patch looks good,
otherwise.

							Pavel
> +int freeze_processes(void)
> +{
> +	unsigned int nr_unfrozen;
> +
> +	printk("Stopping tasks ... ");
> +	nr_unfrozen = try_to_freeze_tasks(FREEZER_USER_SPACE);
> +	if (nr_unfrozen)
> +		return nr_unfrozen;
> +
> +	sys_sync();
> +	nr_unfrozen = try_to_freeze_tasks(FREEZER_KERNEL_THREADS);
> +	if (nr_unfrozen)
> +		return nr_unfrozen;
> +
>  	printk("done.\n");
>  	BUG_ON(in_atomic());
>  	return 0;

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