linux-kernel - Re: [PATCH] bitops: Use volatile in generic atomic bitops.

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Message-Id: <201107271628.29532.arnd@arndb.de>
Date:	Wed, 27 Jul 2011 16:28:29 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Will Newton <will.newton@...il.com>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>, stable@...nel.org
Subject: Re: [PATCH] bitops: Use volatile in generic atomic bitops.

On Wednesday 27 July 2011, Will Newton wrote:
> >
> > Have you observed this behavior? The interrupt disable/enable should
> > always come with a barrier that should prevent the bitops from
> > leaking out, so I don't see how this causes problems in practice.
> 
> Yes, although my arch does not have these barriers. Now I see from
> memory-barriers.txt that lock/unlock are required to implement a
> compiler barrier, sorry for the noise!

Which architectures is this?

	Arnd
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