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-rw-r--r--kernel/rcu/tiny_plugin.h47
1 files changed, 0 insertions, 47 deletions
diff --git a/kernel/rcu/tiny_plugin.h b/kernel/rcu/tiny_plugin.h
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--- a/kernel/rcu/tiny_plugin.h
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1/*
2 * Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition
3 * Internal non-public definitions that provide either classic
4 * or preemptible semantics.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, you can access it online at
18 * http://www.gnu.org/licenses/gpl-2.0.html.
19 *
20 * Copyright (c) 2010 Linaro
21 *
22 * Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
23 */
24
25#if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU)
26#include <linux/kernel_stat.h>
27
28int rcu_scheduler_active __read_mostly;
29EXPORT_SYMBOL_GPL(rcu_scheduler_active);
30
31/*
32 * During boot, we forgive RCU lockdep issues. After this function is
33 * invoked, we start taking RCU lockdep issues seriously. Note that unlike
34 * Tree RCU, Tiny RCU transitions directly from RCU_SCHEDULER_INACTIVE
35 * to RCU_SCHEDULER_RUNNING, skipping the RCU_SCHEDULER_INIT stage.
36 * The reason for this is that Tiny RCU does not need kthreads, so does
37 * not have to care about the fact that the scheduler is half-initialized
38 * at a certain phase of the boot process. Unless SRCU is in the mix.
39 */
40void __init rcu_scheduler_starting(void)
41{
42 WARN_ON(nr_context_switches() > 0);
43 rcu_scheduler_active = IS_ENABLED(CONFIG_SRCU)
44 ? RCU_SCHEDULER_INIT : RCU_SCHEDULER_RUNNING;
45}
46
47#endif /* #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU) */