Patch "cpuidle: fix broadcast control when broadcast can not be entered" has been added to the 4.14-stable tree

Patch "cpuidle: fix broadcast control when broadcast can not be entered" has been added to the 4.14-stable tree

[gregkh]

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 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

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-4.14 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 Wed Dec 20 18:17:52 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
@@ -208,6 +208,7 @@ 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-4.14/cpuidle-fix-broadcast-control-when-broadcast-can-not-be-entered.patch
queue-4.14/powerpc-xmon-avoid-tripping-smp-hardlockup-watchdog.patch
queue-4.14/powerpc-watchdog-do-not-trigger-smp-crash-from-touch_nmi_watchdog.patch