回复: [PATCH] sched/core: add rcu_read_lock/unlock() protection

["Zhang, Qiang" <Qiang.Zhang@windriver.com>]

________________________________________
发件人: Zhang, Qiang <qiang.zhang@windriver.com>
发送时间: 2021年1月26日 16:29
收件人: valentin.schneider@arm.com
抄送: peterz@infradead.org; linux-kernel@vger.kernel.org
主题: [PATCH] sched/core: add rcu_read_lock/unlock() protection

>From: Zqiang <qiang.zhang@windriver.com>

>Due to for_each_process_thread belongs to RCU read operation,
>need to add rcu_read_lock/unlock() protection.

  Sorry to disturb you
  I find it's already in the RCU critical zone
  Please ignore this change


>Signed-off-by: Zqiang <qiang.zhang@windriver.com>
>---
> kernel/sched/core.c | 2 ++
> 1 file changed, 2 insertions(+)
>
>diff --git a/kernel/sched/core.c b/kernel/sched/core.c
>index 8c5481077c9c..c3f0103fdf53 100644
>--- a/kernel/sched/core.c
>+++ b/kernel/sched/core.c
>@@ -7738,6 +7738,7 @@ static void dump_rq_tasks(struct rq *rq, const char *loglvl)
>        lockdep_assert_held(&rq->lock);
>
>        printk("%sCPU%d enqueued tasks (%u total):\n", loglvl, cpu, rq->nr_running);
>+       rcu_read_lock();
>        for_each_process_thread(g, p) {
>                if (task_cpu(p) != cpu)
>                        continue;
>@@ -7747,6 +7748,7 @@ static void dump_rq_tasks(struct rq *rq, const char *loglvl)
>
>                printk("%s\tpid: %d, name: %s\n", loglvl, p->pid, p->comm);
>        }
>+       rcu_read_unlock();
> }
>
> int sched_cpu_dying(unsigned int cpu)
--
2.17.1