Commit 80bbe9f2 authored Mar 06, 2013 by Thomas Gleixner

arm: Use tick broadcast expired check



Avoid going back into deep idle if the tick broadcast IPI is about to
fire.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: LAK <linux-arm-kernel@lists.infradead.org>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Arjan van de Veen <arjan@infradead.org>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Jason Liu <liu.h.jason@gmail.com>
Link: http://lkml.kernel.org/r/20130306111537.640722922@linutronix.de

parent eaa907c5

arch/arm/kernel/process.c

+10 −1

Original line number	Diff line number	Diff line
		@@ -199,7 +199,16 @@ void cpu_idle(void)
		#ifdef CONFIG_PL310_ERRATA_769419
		wmb();
		#endif
		if (hlt_counter) {
		/*
		* In poll mode we reenable interrupts and spin.
		*
		* Also if we detected in the wakeup from idle
		* path that the tick broadcast device expired
		* for us, we don't want to go deep idle as we
		* know that the IPI is going to arrive right
		* away
		*/
		if (hlt_counter \|\| tick_check_broadcast_expired()) {
		local_irq_enable();
		cpu_relax();
		} else if (!need_resched()) {