]> git.baikalelectronics.ru Git - kernel.git/commit
mn10300: Add missing RCU idle APIs on idle loop
authorFrederic Weisbecker <fweisbec@gmail.com>
Wed, 22 Aug 2012 15:27:34 +0000 (17:27 +0200)
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Sun, 23 Sep 2012 14:44:48 +0000 (07:44 -0700)
commit5b26e70f97efee2ea902f82f3e6366985b2d5193
tree5d80491cc2483616122e99cf351839525d0e70e6
parent7cb3e02910a4daa432e646721bbc36cb5fa5d13b
mn10300: Add missing RCU idle APIs on idle loop

In the old times, the whole idle task was considered
as an RCU quiescent state. But as RCU became more and
more successful overtime, some RCU read side critical
section have been added even in the code of some
architectures idle tasks, for tracing for example.

So nowadays, rcu_idle_enter() and rcu_idle_exit() must
be called by the architecture to tell RCU about the part
in the idle loop that doesn't make use of rcu read side
critical sections, typically the part that puts the CPU
in low power mode.

This is necessary for RCU to find the quiescent states in
idle in order to complete grace periods.

Add this missing pair of calls in the mn10300's idle loop.

Reported-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
Cc: <stable@vger.kernel.org> # 3.3+
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: David Howells <dhowells@redhat.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
arch/mn10300/kernel/process.c