sched/rt: Fix possible warn when push_rt_task
hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I7DX9Y CVE: NA ------------------------------- A warn may be triggered during reboot, as follows: reboot ->kernel_restart ->machine_restart ->smp_send_stop --- ipi handler set_cpu_online(cpu, false) balance_callback -> __balance_callback ->push_rt_task -> find_lock_lowest_rq <从vec->mask获取的rq> -> find_lowest_rq -> cpupri_find -> cpupri_find_fitness -> __cpupri_find [cpumask_and(..., vec->mask)] -> set_task_cpu(next_task, lowest_rq->cpu) --- WARN_ON(!oneline(cpu) So add !cpu_online(lowest_rq->cpu) check before set_task_cpu(). The fix does not completely fix the problem, since cpu_online_mask may be cleared after check. Fixes: 4ff9083b ("sched/core: WARN() when migrating to an offline CPU") Signed-off-by: NHui Tang <tanghui20@huawei.com> Reviewed-by: NZhang Qiao <zhangqiao22@huawei.com> Reviewed-by: NChen Hui <judy.chenhui@huawei.com> Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>
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