]> git.baikalelectronics.ru Git - kernel.git/commit
ia64: Add missing RCU idle APIs on idle loop
authorPaul E. McKenney <paul.mckenney@linaro.org>
Fri, 24 Aug 2012 20:22:13 +0000 (13:22 -0700)
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Sun, 23 Sep 2012 14:44:52 +0000 (07:44 -0700)
commit5cfe557bf097429ea7c24399cd3ff426e78f1f59
tree7dbba89f5cb77b25c55b2be66cd456a7068a0c90
parent120e33ab33a1ee558458cc95f967473cd102816a
ia64: Add missing RCU idle APIs on idle loop

Traditionally, the entire idle task served as an RCU quiescent state.
But when RCU read side critical sections started appearing within the
idle loop, this traditional strategy became untenable.  The fix was to
create new RCU APIs named rcu_idle_enter() and rcu_idle_exit(), which
must be called by each architecture's idle loop so that RCU can tell
when it is safe to ignore a given idle CPU.

Unfortunately, this fix was never applied to ia64, a shortcoming remedied
by this commit.

Reported by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Cc: <stable@vger.kernel.org> # 3.3+
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
arch/ia64/kernel/process.c