[PATCH] powerpc: Fix WARN_ON in decrementer_check_overflow

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

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>
---

I was initially planning to fix that with a more in-depth rework
of how we do lazy irq disabling on powerpc, but that patch is
becoming too complex for this release so I'll apply this as a
stop-gap and leave the full rework for -next
 
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 set_soft_enabled(unsigned long enable)
 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)