From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Wed, 17 Oct 2007 06:26:04 +0000 (-0700)
Subject: Immunize rcu_dereference() against crazy compiler writers
X-Git-Tag: v2.6.24-rc1~778
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=97b430320ce7c95f0d5587c5ecc8f6a9d0c698e9;p=pandora-kernel.git

Immunize rcu_dereference() against crazy compiler writers

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@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Josh Triplett <josh@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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