powerpc: Fix WARN_ON in decrementer_check_overflow
We use __get_cpu_var() which triggers a false positive warning
in smp_processor_id() thinking interrupts are enabled (at this
point, they are soft-enabled but hard-disabled).
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 701d4ac..01e2877 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -118,10 +118,14 @@
static inline notrace void decrementer_check_overflow(void)
{
u64 now = get_tb_or_rtc();
- u64 *next_tb = &__get_cpu_var(decrementers_next_tb);
+ u64 *next_tb;
+
+ preempt_disable();
+ next_tb = &__get_cpu_var(decrementers_next_tb);
if (now >= *next_tb)
set_dec(1);
+ preempt_enable();
}
notrace void arch_local_irq_restore(unsigned long en)