This is a note to let you know that I've just added the patch titled
cpuidle: fix broadcast control when broadcast can not be entered
to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: cpuidle-fix-broadcast-control-when-broadcast-can-not-be-entered.patch and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Thu Dec 21 09:02:40 CET 2017
From: Nicholas Piggin npiggin@gmail.com Date: Fri, 1 Sep 2017 14:29:56 +1000 Subject: cpuidle: fix broadcast control when broadcast can not be entered
From: Nicholas Piggin npiggin@gmail.com
[ Upstream commit f187851b9b4a76952b1158b86434563dd2031103 ]
When failing to enter broadcast timer mode for an idle state that requires it, a new state is selected that does not require broadcast, but the broadcast variable remains set. This causes tick_broadcast_exit to be called despite not having entered broadcast mode.
This causes the WARN_ON_ONCE(!irqs_disabled()) to trigger in some cases. It does not appear to cause problems for code today, but seems to violate the interface so should be fixed.
Signed-off-by: Nicholas Piggin npiggin@gmail.com Reviewed-by: Thomas Gleixner tglx@linutronix.de Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/cpuidle/cpuidle.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -189,6 +189,7 @@ int cpuidle_enter_state(struct cpuidle_d return -EBUSY; } target_state = &drv->states[index]; + broadcast = false; }
/* Take note of the planned idle state. */
Patches currently in stable-queue which might be from npiggin@gmail.com are
queue-4.9/cpuidle-fix-broadcast-control-when-broadcast-can-not-be-entered.patch