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| author | James Hogan <james.hogan@imgtec.com> | 2013-06-28 13:56:02 +0100 |
|---|---|---|
| committer | James Hogan <james.hogan@imgtec.com> | 2013-07-02 11:03:51 +0100 |
| commit | 234c7f1ac109ad1af4ae410463d03ccebf3d6657 (patch) | |
| tree | 445494b2ed23a56964859e048d4eed0933dc8060 /arch | |
| parent | 42748752f6ada54faa4f39fa471dabce62eaa79a (diff) | |
| download | linux-234c7f1ac109ad1af4ae410463d03ccebf3d6657.tar.gz linux-234c7f1ac109ad1af4ae410463d03ccebf3d6657.tar.xz | |
metag: smp: enable irqs after set_cpu_online
In secondary_start_kernel() interrupts should be enabled with
local_irq_enable() after the cpu is marked as online with
set_cpu_online(). Otherwise it's possible for a timer interrupt to
trigger a softirq, which if the cpu is marked as offline may have it's
affinity altered.
Reported-by: Kirill Tkhai <tkhai@yandex.ru>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Kirill Tkhai <tkhai@yandex.ru>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/metag/kernel/smp.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/arch/metag/kernel/smp.c b/arch/metag/kernel/smp.c index b81351538c48..09979f203a4d 100644 --- a/arch/metag/kernel/smp.c +++ b/arch/metag/kernel/smp.c @@ -379,12 +379,7 @@ asmlinkage void secondary_start_kernel(void) setup_priv(); - /* - * Enable local interrupts. - */ - tbi_startup_interrupt(TBID_SIGNUM_TRT); notify_cpu_starting(cpu); - local_irq_enable(); pr_info("CPU%u (thread %u): Booted secondary processor\n", cpu, cpu_2_hwthread_id[cpu]); @@ -398,6 +393,12 @@ asmlinkage void secondary_start_kernel(void) set_cpu_online(cpu, true); /* + * Enable local interrupts. + */ + tbi_startup_interrupt(TBID_SIGNUM_TRT); + local_irq_enable(); + + /* * OK, it's off to the idle thread for us */ cpu_startup_entry(CPUHP_ONLINE); |