Messages in this thread Patch in this message | | | From | Chao Yu <> | Subject | [PATCH] sched/fair: fix incorrect calculation of capacity in scale_rt_capacity | Date | Wed, 23 Sep 2015 14:15:51 +0800 |
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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@samsung.com> --- 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
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