rcu: Add memory barriers for NOCB leader wakeup
Wait/wakeup operations do not guarantee ordering on their own. Instead, either locking or memory barriers are required. This commit therefore adds memory barriers to wake_nocb_leader() and nocb_leader_wait(). Signed-off-by:Paul E. McKenney <paulmck@linux.vnet.ibm.com> Tested-by:
Krister Johansen <kjlx@templeofstupid.com> Cc: <stable@vger.kernel.org> # 4.6.x
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511324e4