]> git.baikalelectronics.ru Git - kernel.git/commit
rcu: Remove redundant memory barrier from __call_rcu()
authorPaul E. McKenney <paul.mckenney@linaro.org>
Mon, 13 Aug 2012 23:34:12 +0000 (16:34 -0700)
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Sun, 23 Sep 2012 14:42:51 +0000 (07:42 -0700)
commit717c052d2d4331ca023d98678ef2b51e8e412430
tree5a8b75266eb451b0766f2c622744ae984ac7c3b5
parent7755c8bf2879cd753e11b67f30ff4bce2daaee80
rcu: Remove redundant memory barrier from __call_rcu()

The first memory barrier in __call_rcu() is supposed to order any
updates done beforehand by the caller against the actual queuing
of the callback.  However, the second memory barrier (which is intended
to order incrementing the queue lengths before queuing the callback)
is also between the caller's updates and the queuing of the callback.
The second memory barrier can therefore serve both purposes.

This commit therefore removes the first memory barrier.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
kernel/rcutree.c