diff mbox

[tip/core/rcu,3/4] rcu: Stop spurious warnings from synchronize_sched_expedited

Message ID 1329847110-10897-4-git-send-email-paulmck@linux.vnet.ibm.com
State Accepted
Commit 1cc85961e214773cb7d7f2ccbe3bc644dd466df0
Headers show

Commit Message

Paul E. McKenney Feb. 21, 2012, 5:58 p.m. UTC 
From: Hugh Dickins <hughd@google.com>

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@google.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
 kernel/rcutree.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
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Patch

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index eacc10b..1050d6d 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -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