From: Paul E. McKenney <paul.mckenney@linaro.org>
Date: Mon, 1 Aug 2011 13:22:11 +0000 (-0700)
Subject: rcu: Move __rcu_read_unlock()'s barrier() within if-statement
X-Git-Tag: v3.2-rc1~165^2^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6206ab9bab620fc0fbbed30ce20d145b0b3d1840;p=pandora-kernel.git

rcu: Move __rcu_read_unlock()'s barrier() within if-statement

We only need to constrain the compiler if we are actually exiting
the top-level RCU read-side critical section.  This commit therefore
moves the first barrier() cal in __rcu_read_unlock() to inside the
"if" statement, thus avoiding needless register flushes for inner
rcu_read_unlock() calls.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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