linux-kernel - [PATCH 1/2] sched: Fix "divide error: 0000" in find_busiest

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Date:	Tue, 19 Jul 2011 14:58:46 -0600
From:	Terry Loftin <terry.loftin@...com>
To:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>
CC:	Bob Montgomery <bob.montgomery@...com>
Subject: [PATCH 1/2] sched: Fix "divide error: 0000" in find_busiest_group

Correct the protection expression in update_cpu_power() to avoid setting
rq->cpu_power to zero.

Signed-off-by: Terry Loftin <terry.loftin@...com>
Signed-off-by: Bob Montgomery <bob.montgomery@...com>
---
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 0c26e2d..9c50020 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -2549,7 +2549,7 @@ static void update_cpu_power(struct sched_domain *sd, int cpu)
 	power *= scale_rt_power(cpu);
 	power >>= SCHED_LOAD_SHIFT;

-	if (!power)
+	if ((u32)power == 0)
 		power = 1;

 	cpu_rq(cpu)->cpu_power = power;
--
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