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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-04-18 17:25:03 -0400
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-08-18 20:05:32 -0400
commitd84297c99bd9f63baf92c9f2d36582f879858664 (patch)
tree5fa42b0c2ef8ae93f016dd5b0ea318bc720f5482 /include
parentf7f7bac9cb1c50783f15937a11743655a5756a36 (diff)
rcu: Fix rcu_barrier() documentation
There was a time when rcu_barrier() was guaranteed to wait for at least a grace period, but that time ended due to energy-efficiency concerns. So now rcu_barrier() is a no-op if there are no RCU callbacks queued in the system. This commit updates the documentation to reflect this change. Now, rcu_barrier() often does wait for a grace period, so, one could imagine some modification to rcu_barrier() to more efficiently handle cases where both rcu_barrier() and a grace period are needed. But this must wait until someone shows a real-world need for a change. Reported-by: Bob Copeland <bob@cozybit.com> Reported-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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