linux-kernel - Re: [PATCH] Immunize rcu_dereference() against crazy compiler writers

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Message-Id: <1184256500.3000.1.camel@josh-work.beaverton.ibm.com>
Date:	Thu, 12 Jul 2007 09:08:20 -0700
From:	Josh Triplett <josht@...ux.vnet.ibm.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, dipankar@...ibm.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] Immunize rcu_dereference() against crazy compiler
	writers

On Wed, 2007-07-11 at 18:00 -0700, Paul E. McKenney wrote:
> Turns out that compiler writers are a bit more aggressive about optimizing
> than one might expect.  This patch prevents a number of such optimizations
> from messing up rcu_deference().  This is not merely a theoretical
> problem, as evidenced by the rmb() in mce_log().
> 
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Acked-by: Josh Triplett <josh@...nel.org>

- Josh Triplett


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