From: Hui Tang <tanghui20@huawei.com> hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I7F7KV CVE: NA ------------------------------- Delete redundant updates to p->prefer_cpus when smart grid used. Add missed check for p->prefer_cpus when !CONFIG_QOS_SCHED_SMART_GRID. Fixes: 21e5d85e205f ("sched: Fix possible deadlock in tg_set_dynamic_affinity_mode") Signed-off-by: Hui Tang <tanghui20@huawei.com> Reviewed-by: Zhang Qiao <zhangqiao22@huawei.com> Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com> Signed-off-by: Yipeng Zou <zouyipeng@huawei.com> --- kernel/sched/core.c | 10 ---------- kernel/sched/fair.c | 8 ++++++-- 2 files changed, 6 insertions(+), 12 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 4c04ef0d3fe3..eae3fdcfb73c 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -8790,9 +8790,6 @@ void sched_move_task(struct task_struct *tsk) DEQUEUE_SAVE | DEQUEUE_MOVE | DEQUEUE_NOCLOCK; struct rq_flags rf; struct rq *rq; -#ifdef CONFIG_QOS_SCHED_SMART_GRID - struct affinity_domain *ad; -#endif rq = task_rq_lock(tsk, &rf); update_rq_clock(rq); @@ -8820,13 +8817,6 @@ void sched_move_task(struct task_struct *tsk) } task_rq_unlock(rq, tsk, &rf); - -#ifdef CONFIG_QOS_SCHED_SMART_GRID - if (smart_grid_used()) { - ad = &task_group(tsk)->auto_affinity->ad; - set_prefer_cpus_ptr(tsk, ad->domains[ad->curr_level]); - } -#endif } static inline struct task_group *css_tg(struct cgroup_subsys_state *css) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index c1d0248f7c2e..a47c44d526eb 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -6242,17 +6242,21 @@ static void destroy_auto_affinity(struct task_group *tg) static void destroy_auto_affinity(struct task_group *tg) {} #ifdef CONFIG_QOS_SCHED_DYNAMIC_AFFINITY +static inline bool prefer_cpus_valid(struct task_struct *p); + static inline struct cpumask *task_prefer_cpus(struct task_struct *p) { return p->prefer_cpus; } -#endif static inline int dynamic_affinity_mode(struct task_struct *p) { + if (!prefer_cpus_valid(p)) + return -1; + return 0; } - +#endif #endif /************************************************** -- 2.34.1