| /* |
| * 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) */ |
