[PATCH next] rcu: stop spurious warnings fromsynchronize_sched_expedited

[Hugh Dickins]

synchronize_sched_expedited() is spamming CONFIG_DEBUG_PREEMPT=y
users with an unintended warning from the cpu_is_offline() check:
use raw_smp_processor_id() instead of smp_processor_id() there.

Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
---

 kernel/rcutree.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- next/kernel/rcutree.c	2012-02-17 08:02:15.680065066 -0800
+++ linux/kernel/rcutree.c	2012-02-17 10:41:18.764003566 -0800
@@ -2014,7 +2014,7 @@ void synchronize_sched_expedited(void)
 	/* Note that atomic_inc_return() implies full memory barrier. */
 	firstsnap = snap = atomic_inc_return(&sync_sched_expedited_started);
 	get_online_cpus();
-	WARN_ON_ONCE(cpu_is_offline(smp_processor_id()));
+	WARN_ON_ONCE(cpu_is_offline(raw_smp_processor_id()));
 
 	/*
 	 * Each pass through the following loop attempts to force a
--
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