[PATCH] sched/fair: fix incorrect calculation of capacity in scale_rt_capacity

[Chao Yu]

div_u64 can only handle 32-bits divisor, if our divisor is with type of
64-bits, we should use div64_u64 instead, otherwise value of divisor will
be cast to 32-bits, resulting in wrong calculation.

Signed-off-by: Chao Yu <chao2.yu@xxxxxxxxxxx>
---
 kernel/sched/fair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 9176f7c..ee268ef 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6086,7 +6086,7 @@ static unsigned long scale_rt_capacity(int cpu)
 
 	total = sched_avg_period() + delta;
 
-	used = div_u64(avg, total);
+	used = div64_u64(avg, total);
 
 	if (likely(used < SCHED_CAPACITY_SCALE))
 		return SCHED_CAPACITY_SCALE - used;
-- 
2.5.2


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/