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rcu: Move end of special early-boot RCU operation earlier

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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 <mingo@elte.hu>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul E. McKenney 2009-09-02 14:01:24 -07:00 committed by Ingo Molnar
parent 29e2035bdd
commit 7db905e636
1 changed files with 1 additions and 1 deletions
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2
init/main.c
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@ -451,6 +451,7 @@ static noinline void __init_refok rest_init(void)
{ {
int pid; int pid;
rcu_scheduler_starting();
kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
numa_default_policy(); numa_default_policy();
pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); 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: * at least once to get things moving:
*/ */
init_idle_bootup_task(current); init_idle_bootup_task(current);
rcu_scheduler_starting();
preempt_enable_no_resched(); preempt_enable_no_resched();
schedule(); schedule();
preempt_disable(); preempt_disable();