48 строки
1.8 KiB
C
48 строки
1.8 KiB
C
/*
|
|
* Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition
|
|
* Internal non-public definitions that provide either classic
|
|
* or preemptible semantics.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, you can access it online at
|
|
* http://www.gnu.org/licenses/gpl-2.0.html.
|
|
*
|
|
* Copyright (c) 2010 Linaro
|
|
*
|
|
* Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
|
|
*/
|
|
|
|
#if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU)
|
|
#include <linux/kernel_stat.h>
|
|
|
|
int rcu_scheduler_active __read_mostly;
|
|
EXPORT_SYMBOL_GPL(rcu_scheduler_active);
|
|
|
|
/*
|
|
* During boot, we forgive RCU lockdep issues. After this function is
|
|
* invoked, we start taking RCU lockdep issues seriously. Note that unlike
|
|
* Tree RCU, Tiny RCU transitions directly from RCU_SCHEDULER_INACTIVE
|
|
* to RCU_SCHEDULER_RUNNING, skipping the RCU_SCHEDULER_INIT stage.
|
|
* The reason for this is that Tiny RCU does not need kthreads, so does
|
|
* not have to care about the fact that the scheduler is half-initialized
|
|
* at a certain phase of the boot process. Unless SRCU is in the mix.
|
|
*/
|
|
void __init rcu_scheduler_starting(void)
|
|
{
|
|
WARN_ON(nr_context_switches() > 0);
|
|
rcu_scheduler_active = IS_ENABLED(CONFIG_SRCU)
|
|
? RCU_SCHEDULER_INIT : RCU_SCHEDULER_RUNNING;
|
|
}
|
|
|
|
#endif /* #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU) */
|