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arm64: Only enable local interrupts after the CPU is marked online 

There is a slight chance that (timer) interrupts are triggered before a
secondary CPU has been marked online with implications on softirq thread
affinity.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Kirill Tkhai <tkhai@yandex.ru>
This commit is contained in:
Catalin Marinas 2013-07-19 15:08:15 +01:00
parent ad81f0545e
commit 53ae3acd43
1 changed files with 8 additions and 7 deletions
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15
arch/arm64/kernel/smp.c
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@ -199,13 +199,6 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
raw_spin_lock(&boot_lock); raw_spin_lock(&boot_lock);
raw_spin_unlock(&boot_lock); raw_spin_unlock(&boot_lock);
/*
* Enable local interrupts.
*/
notify_cpu_starting(cpu);
local_irq_enable();
local_fiq_enable();
/* /*
* OK, now it's safe to let the boot CPU continue. Wait for * OK, now it's safe to let the boot CPU continue. Wait for
* the CPU migration code to notice that the CPU is online * the CPU migration code to notice that the CPU is online
@ -214,6 +207,14 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
set_cpu_online(cpu, true); set_cpu_online(cpu, true);
complete(&cpu_running); complete(&cpu_running);
/*
* Enable GIC and timers.
*/
notify_cpu_starting(cpu);
local_irq_enable();
local_fiq_enable();
/* /*
* OK, it's off to the idle thread for us * OK, it's off to the idle thread for us
*/ */