From: Paul E. McKenney Date: Wed, 2 Sep 2009 21:01:24 +0000 (-0700) Subject: rcu: Move end of special early-boot RCU operation earlier X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=7db905e636f08ea5bc9825c1f73d77802e8ccad5;p=deliverable%2Flinux.git rcu: Move end of special early-boot RCU operation earlier Ingo was getting warnings from rcu_scheduler_starting() indicating that context switches had occurred before RCU ended its special early-boot handling of grace periods. This is a dangerous condition, as it indicates that RCU might have prematurely ended grace periods. This exploratory fix moves rcu_scheduler_starting() earlier in boot. Reported-by: Ingo Molnar Signed-off-by: Paul E. McKenney Signed-off-by: Ingo Molnar --- diff --git a/init/main.c b/init/main.c index 11f4f145be3f..525f6fb2bd22 100644 --- a/init/main.c +++ b/init/main.c @@ -451,6 +451,7 @@ static noinline void __init_refok rest_init(void) { int pid; + rcu_scheduler_starting(); kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); numa_default_policy(); pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); @@ -462,7 +463,6 @@ static noinline void __init_refok rest_init(void) * at least once to get things moving: */ init_idle_bootup_task(current); - rcu_scheduler_starting(); preempt_enable_no_resched(); schedule(); preempt_disable();