linux-kernel - [ 104/221] cpuidle / coupled: fix ready counter decrement

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Date:	Tue, 15 Jan 2013 10:50:31 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Sivaram Nair <sivaramn@...dia.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Colin Cross <ccross@...roid.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [ 104/221] cpuidle / coupled: fix ready counter decrement

3.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sivaram Nair <sivaramn@...dia.com>

commit 92638e2facc5330475c7d558acec77721c3214e4 upstream.

The ready_waiting_counts atomic variable is compared against the wrong
online cpu count. The latter is computed incorrectly using logical-OR
instead of bit-OR. This patch fixes that.

Signed-off-by: Sivaram Nair <sivaramn@...dia.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>
Acked-by: Colin Cross <ccross@...roid.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/cpuidle/coupled.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/cpuidle/coupled.c
+++ b/drivers/cpuidle/coupled.c
@@ -209,7 +209,7 @@ inline int cpuidle_coupled_set_not_ready
 	int all;
 	int ret;
 
-	all = coupled->online_count || (coupled->online_count << WAITING_BITS);
+	all = coupled->online_count | (coupled->online_count << WAITING_BITS);
 	ret = atomic_add_unless(&coupled->ready_waiting_counts,
 		-MAX_WAITING_CPUS, all);
 


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