Commit f36d3401 authored Nov 30, 2010 by Russell King

ARM: CPU hotplug: ensure correct ordering of unplug



Don't call idle_task_exit() with interrupts disabled, and ensure
that we have a memory barrier after interrupts are disabled but
before signalling that this CPU has shut down.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

parent bbc81fd4

arch/arm/kernel/smp.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -269,9 +269,11 @@ void __ref cpu_die(void)
		{
		unsigned int cpu = smp_processor_id();

		local_irq_disable();
		idle_task_exit();

		local_irq_disable();
		mb();

		/* Tell __cpu_die() that this CPU is now safe to dispose of */
		complete(&cpu_died);