sched/fair: Use recent_used_cpu to test p->cpus_ptr

[ Upstream commit ae2ad293d6be143ad223f5f947cca07bcbe42595 ]

When checking whether a recently used CPU can be a potential idle
candidate, recent_used_cpu should be used to test p->cpus_ptr as
p->recent_used_cpu is not equal to recent_used_cpu and candidate
decision is made based on recent_used_cpu here.

Fixes: 89aafd67f28c ("sched/fair: Use prev instead of new target as recent_used_cpu")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Phil Auld <pauld@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Link: https://lore.kernel.org/r/20230620080747.359122-1-linmiaohe@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 57d39de..5e5aea2 100644 (file)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6935,7 +6935,7 @@ static int select_idle_sibling(struct task_struct *p, int prev, int target)
            recent_used_cpu != target &&
            cpus_share_cache(recent_used_cpu, target) &&
            (available_idle_cpu(recent_used_cpu) || sched_idle_cpu(recent_used_cpu)) &&
-           cpumask_test_cpu(p->recent_used_cpu, p->cpus_ptr) &&
+           cpumask_test_cpu(recent_used_cpu, p->cpus_ptr) &&
            asym_fits_cpu(task_util, util_min, util_max, recent_used_cpu)) {
                return recent_used_cpu;
        }