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 4.4-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-4.4 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 10:35:49 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-4.4/cpuidle-fix-broadcast-control-when-broadcast-can-not-be-entered.patch