X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=kernel%2Fsched.c;h=ae8f75a5ceb462dee501411da663eb8ec84f842d;hb=6506cf6ce68d78a5470a8360c965dafe8e4b78e3;hp=dc85ceb908322cad7196339f4df8dd58c37b1cec;hpb=b68e9d4581cbb211be3e174d3445b4917aacbcf6;p=pandora-kernel.git

diff --git a/kernel/sched.c b/kernel/sched.c
index dc85ceb90832..ae8f75a5ceb4 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5337,7 +5337,19 @@ void __cpuinit init_idle(struct task_struct *idle, int cpu)
 	idle->se.exec_start = sched_clock();
 
 	cpumask_copy(&idle->cpus_allowed, cpumask_of(cpu));
+	/*
+	 * We're having a chicken and egg problem, even though we are
+	 * holding rq->lock, the cpu isn't yet set to this cpu so the
+	 * lockdep check in task_group() will fail.
+	 *
+	 * Similar case to sched_fork(). / Alternatively we could
+	 * use task_rq_lock() here and obtain the other rq->lock.
+	 *
+	 * Silence PROVE_RCU
+	 */
+	rcu_read_lock();
 	__set_task_cpu(idle, cpu);
+	rcu_read_unlock();
 
 	rq->curr = rq->idle = idle;
 #if defined(CONFIG_SMP) && defined(__ARCH_WANT_UNLOCKED_CTXSW)