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Commit 7db905e6 authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Ingo Molnar
Browse files

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: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 29e2035b

init/main.c

+1 −1
Original line number Diff line number Diff line
@@ -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();