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

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Date:	Tue, 03 Jul 2007 15:31:26 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Pavel Machek <pavel@....cz>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	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)

On Tue, 2007-06-26 at 10:48 +0200, Pavel Machek wrote:
> > The problem, as far as I understand it, is that the instructions can
> get
> > reordered if there are no barriers in there.
> 
> Are you sure?  I thought atomic variables have barrirers built-in.

bzzzt. they don't.

Ben.


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