X-Git-Url: https://bbs.cooldavid.org/git/?a=blobdiff_plain;f=kernel%2Fsched.c;h=f52a8801b7a285fb252ecc6935b55f525813881b;hb=123f94f22e3d283dfe68742b269c245b0501ad82;hp=f87abe3b0176613d03d722b4ed74fc56f3597dfa;hpb=8c215bd3890c347dfb6a2db4779755f8b9c298a9;p=net-next-2.6.git

diff --git a/kernel/sched.c b/kernel/sched.c
index f87abe3b017..f52a8801b7a 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2494,7 +2494,16 @@ void sched_fork(struct task_struct *p, int clone_flags)
 	if (p->sched_class->task_fork)
 		p->sched_class->task_fork(p);
 
+	/*
+	 * The child is not yet in the pid-hash so no cgroup attach races,
+	 * and the cgroup is pinned to this child due to cgroup_fork()
+	 * is ran before sched_fork().
+	 *
+	 * Silence PROVE_RCU.
+	 */
+	rcu_read_lock();
 	set_task_cpu(p, cpu);
+	rcu_read_unlock();
 
 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
 	if (likely(sched_info_on()))