From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Sat, 21 May 2011 12:57:18 +0000 (-0700)
Subject: rcu: Streamline code produced by __rcu_read_unlock()
X-Git-Tag: v3.0~7^2^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=be0e1e21ef707be4d16ea6a96ac9997463e4b8d2;p=pandora-kernel.git

rcu: Streamline code produced by __rcu_read_unlock()

Given some common flag combinations, particularly -Os, gcc will inline
rcu_read_unlock_special() despite its being in an unlikely() clause.
Use noinline to prohibit this misoptimization.

In addition, move the second barrier() in __rcu_read_unlock() so that
it is not on the common-case code path.  This will allow the compiler to
generate better code for the common-case path through __rcu_read_unlock().

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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