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ARM: SMP: wait for CPU to be marked active

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When we bring a CPU online, we should wait for it to become active
before entering the idle thread, so we know that the scheduler and
thread migration is going to work.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2011-06-20 16:46:01 +01:00
parent 9a00318ead
commit 573619d165
1 changed files with 5 additions and 1 deletions
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6
arch/arm/kernel/smp.c
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@ -318,9 +318,13 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
smp_store_cpu_info(cpu);
/*
* OK, now it's safe to let the boot CPU continue
* OK, now it's safe to let the boot CPU continue. Wait for
* the CPU migration code to notice that the CPU is online
* before we continue.
*/
set_cpu_online(cpu, true);
while (!cpu_active(cpu))
cpu_relax();
/*
* OK, it's off to the idle thread for us