From: Yang Yingliang <yangyingliang@huawei.com> hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I7YBSW CVE: NA -------------------------------- 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; } -- 2.25.1