blob: c4ba9a78721e1f4130526255050a1ed7f888ca4b [file] [log] [blame]
Paul E. McKenney9b1d82f2009-10-25 19:03:50 -07001/*
2 * Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 *
18 * Copyright IBM Corporation, 2008
19 *
20 * Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
21 *
22 * For detailed explanation of Read-Copy Update mechanism see -
Ingo Molnar4ce5b902009-10-26 07:55:55 +010023 * Documentation/RCU
Paul E. McKenney9b1d82f2009-10-25 19:03:50 -070024 */
Paul E. McKenney9b1d82f2009-10-25 19:03:50 -070025#ifndef __LINUX_TINY_H
26#define __LINUX_TINY_H
27
28#include <linux/cache.h>
29
30void rcu_sched_qs(int cpu);
31void rcu_bh_qs(int cpu);
32
33#define __rcu_read_lock() preempt_disable()
34#define __rcu_read_unlock() preempt_enable()
35#define __rcu_read_lock_bh() local_bh_disable()
36#define __rcu_read_unlock_bh() local_bh_enable()
37#define call_rcu_sched call_rcu
38
39#define rcu_init_sched() do { } while (0)
40extern void rcu_check_callbacks(int cpu, int user);
Paul E. McKenney9b1d82f2009-10-25 19:03:50 -070041
Paul E. McKenney6ebb2372009-11-22 08:53:50 -080042static inline int rcu_needs_cpu(int cpu)
43{
44 return 0;
45}
46
Paul E. McKenney9b1d82f2009-10-25 19:03:50 -070047/*
48 * Return the number of grace periods.
49 */
50static inline long rcu_batches_completed(void)
51{
52 return 0;
53}
54
55/*
56 * Return the number of bottom-half grace periods.
57 */
58static inline long rcu_batches_completed_bh(void)
59{
60 return 0;
61}
62
63extern int rcu_expedited_torture_stats(char *page);
64
Paul E. McKenney6ebb2372009-11-22 08:53:50 -080065#define synchronize_rcu synchronize_sched
66
Paul E. McKenney9b1d82f2009-10-25 19:03:50 -070067static inline void synchronize_rcu_expedited(void)
68{
69 synchronize_sched();
70}
71
72static inline void synchronize_rcu_bh_expedited(void)
73{
74 synchronize_sched();
75}
76
77struct notifier_block;
Paul E. McKenney9b1d82f2009-10-25 19:03:50 -070078
79#ifdef CONFIG_NO_HZ
80
81extern void rcu_enter_nohz(void);
82extern void rcu_exit_nohz(void);
83
84#else /* #ifdef CONFIG_NO_HZ */
85
86static inline void rcu_enter_nohz(void)
87{
88}
89
90static inline void rcu_exit_nohz(void)
91{
92}
93
94#endif /* #else #ifdef CONFIG_NO_HZ */
95
Paul E. McKenney6ebb2372009-11-22 08:53:50 -080096static inline void rcu_scheduler_starting(void)
97{
98}
99
Paul E. McKenney9b1d82f2009-10-25 19:03:50 -0700100static inline void exit_rcu(void)
101{
102}
103
104#endif /* __LINUX_RCUTINY_H */