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ARM: CPU hotplug: ensure correct ordering of unplug

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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>
This commit is contained in:
Russell King 2010-11-30 12:21:30 +00:00
parent bbc81fd432
commit f36d340122
1 changed files with 3 additions and 1 deletions
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4
arch/arm/kernel/smp.c
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@ -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);