From: Yang Yingliang yangyingliang@huawei.com

hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I7YBSW CVE: NA

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If cpuset_cpu_inactive() fails in sched_cpu_deactivate(), the cpu offline failed, but sched_smt_present is decreased before calling sched_cpu_deactivate, it leads unbalance dec/inc, so fix it by increasing sched_smt_present in the error path.

Signed-off-by: Yang Yingliang yangyingliang@huawei.com Signed-off-by: Yu Liao liaoyu15@huawei.com --- kernel/sched/core.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 920a5af0e346..669a62d16ba6 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -8060,6 +8060,10 @@ int sched_cpu_deactivate(unsigned int cpu)

ret = cpuset_cpu_inactive(cpu); if (ret) { +#ifdef CONFIG_SCHED_SMT + if (cpumask_weight(cpu_smt_mask(cpu)) == 2) + static_branch_inc_cpuslocked(&sched_smt_present); +#endif set_cpu_active(cpu, true); return ret; }