Ping. > -----Original Message----- > From: Chao Yu [mailto:[email protected]] > Sent: Wednesday, September 23, 2015 2:16 PM > To: '[email protected]'; '[email protected]' > Cc: '[email protected]' > Subject: [PATCH] sched/fair: fix incorrect calculation of capacity in > scale_rt_capacity > > 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 <[email protected]> > --- > 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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