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>

1 files changed, 8 insertions, 7 deletions

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 5d54e3717bf8..9c93e126328c 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -200,13 +200,6 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
         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
          * the CPU migration code to notice that the CPU is online
          * before we continue.
@@ -215,6 +208,14 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
         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
          */
         cpu_startup_entry(CPUHP_ONLINE);