tree b57912ba9fff6f2deba89c0178d3122bbd1fda6e
parent 6846c0c54074d47927c90eab4a805115e1ae3292
author Paul E. McKenney <paul.mckenney@linaro.org> 1312204931 -0700
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1317271115 -0700

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>