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bbad9379 | 1 | /* |
a57eb940 | 2 | * Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition |
bbad9379 | 3 | * Internal non-public definitions that provide either classic |
a57eb940 | 4 | * or preemptible semantics. |
bbad9379 PM |
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 | |
87de1cfd PM |
17 | * along with this program; if not, you can access it online at |
18 | * http://www.gnu.org/licenses/gpl-2.0.html. | |
bbad9379 | 19 | * |
a57eb940 | 20 | * Copyright (c) 2010 Linaro |
bbad9379 PM |
21 | * |
22 | * Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com> | |
23 | */ | |
24 | ||
900b1028 | 25 | #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU) |
318bdcd9 PM |
26 | #include <linux/kernel_stat.h> |
27 | ||
24278d14 PM |
28 | int rcu_scheduler_active __read_mostly; |
29 | EXPORT_SYMBOL_GPL(rcu_scheduler_active); | |
bbad9379 PM |
30 | |
31 | /* | |
32 | * During boot, we forgive RCU lockdep issues. After this function is | |
52d7e48b PM |
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 | |
900b1028 | 38 | * at a certain phase of the boot process. Unless SRCU is in the mix. |
bbad9379 | 39 | */ |
b2c0710c | 40 | void __init rcu_scheduler_starting(void) |
bbad9379 PM |
41 | { |
42 | WARN_ON(nr_context_switches() > 0); | |
900b1028 PM |
43 | rcu_scheduler_active = IS_ENABLED(CONFIG_SRCU) |
44 | ? RCU_SCHEDULER_INIT : RCU_SCHEDULER_RUNNING; | |
bbad9379 PM |
45 | } |
46 | ||
900b1028 | 47 | #endif /* #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU) */ |