mask is built in build_balance_mask() by for_each_cpu(i, sg_span), so it must be a subset of sched_group_span(sg). Though cpumask_first_and doesn't lead to a wrong result of balance cpu, it is pointless to do cpumask_and again.
Signed-off-by: Barry Song song.bao.hua@hisilicon.com --- kernel/sched/topology.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index 12f8058..45f3db2 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -934,7 +934,7 @@ static void init_overlap_sched_group(struct sched_domain *sd, int cpu;
build_balance_mask(sd, sg, mask); - cpu = cpumask_first_and(sched_group_span(sg), mask); + cpu = cpumask_first(mask);
sg->sgc = *per_cpu_ptr(sdd->sgc, cpu); if (atomic_inc_return(&sg->sgc->ref) == 1)