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 <[email protected]>
Reported-by: Kirill Tkhai <[email protected]>
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 5d54e371..9c93e12 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -200,13 +200,6 @@
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 @@
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);
