linux-kernel - Re: [PATCH -mm] PM: Prevent frozen user mode helpers from failing the freezing of tasks (rev. 2)

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Message-ID: <20070625215527.GE2051@elf.ucw.cz>
Date:	Mon, 25 Jun 2007 23:55:27 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Uli Luckas <u.luckas@...d.de>, Oleg Nesterov <oleg@...sign.ru>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm] PM: Prevent frozen user mode helpers from failing the freezing of tasks (rev. 2)

Hi!

> [I hope the ACKs still apply.]

Uhuh, not 100% sure.

> +static int usermodehelper_disabled;
> +


...

>  	case PM_HIBERNATION_PREPARE:
>  	case PM_SUSPEND_PREPARE:
>  		usermodehelper_disabled = 1;
> -		return NOTIFY_OK;
> +		smp_mb();

usermodehelper_disabled should be atomic variable, too, so we don't
have to play these ugly tricks by hand? This should not be
performance-critical, right?
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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