From: Colin Cross <ccross@android.com>
Date: Wed, 30 Nov 2011 00:37:07 +0000 (-0800)
Subject: ARM: idle: call idle notifiers before stopping nohz tick
X-Git-Tag: firefly_0821_release~7613^2~215
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=b86fd0b62252fbba6a5d6acda09fd325fb8e201b;p=firefly-linux-kernel-4.4.55.git

ARM: idle: call idle notifiers before stopping nohz tick

If an idle notifier modifies a timer, calling the notifier after
the sched tick has been stopped may leave the sched tick set too
early.  Move teh idle notifier call before the call to
tick_nohz_stop_sched_tick.

Change-Id: I0db3284bec6d0193bc5e2a57650ab06bd8342319
Signed-off-by: Colin Cross <ccross@android.com>
---

diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 54c97eee6173..7d66a6e66cb6 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -223,8 +223,8 @@ void cpu_idle(void)
 
 	/* endless idle loop with no priority at all */
 	while (1) {
-		tick_nohz_stop_sched_tick(1);
 		idle_notifier_call_chain(IDLE_START);
+		tick_nohz_stop_sched_tick(1);
 		while (!need_resched()) {
 #ifdef CONFIG_HOTPLUG_CPU
 			if (cpu_is_offline(smp_processor_id()))