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Date: Mon, 29 Mar 2010 14:15:25 -0700 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: linux-kernel@...r.kernel.org Cc: mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com, akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org, dvhltc@...ibm.com, niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu, dhowells@...hat.com, eric.dumazet@...il.com, abogani@...ware.it Subject: [PATCH tip/core/urgent] rcu: protect fork-time cgroup access Add an rcu_read_lock() / rcu_read_unlock() pair to protect a fork-time cgroup access. This seems likely to be a false positive. Located by: Alessio Igor Bogani <abogani@...ware.it> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com> --- sched.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/sched.c b/kernel/sched.c index 9ab3cd7..d4bb5e0 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -2621,7 +2621,9 @@ void sched_fork(struct task_struct *p, int clone_flags) if (p->sched_class->task_fork) p->sched_class->task_fork(p); + 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())) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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