Linux kernel mirror (for testing)
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linux
1/*
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 -
23 * Documentation/RCU
24 */
25#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);
41
42static inline int rcu_needs_cpu(int cpu)
43{
44 return 0;
45}
46
47/*
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
65static inline void rcu_force_quiescent_state(void)
66{
67}
68
69static inline void rcu_bh_force_quiescent_state(void)
70{
71}
72
73static inline void rcu_sched_force_quiescent_state(void)
74{
75}
76
77#define synchronize_rcu synchronize_sched
78
79static inline void synchronize_rcu_expedited(void)
80{
81 synchronize_sched();
82}
83
84static inline void synchronize_rcu_bh_expedited(void)
85{
86 synchronize_sched();
87}
88
89struct notifier_block;
90
91#ifdef CONFIG_NO_HZ
92
93extern void rcu_enter_nohz(void);
94extern void rcu_exit_nohz(void);
95
96#else /* #ifdef CONFIG_NO_HZ */
97
98static inline void rcu_enter_nohz(void)
99{
100}
101
102static inline void rcu_exit_nohz(void)
103{
104}
105
106#endif /* #else #ifdef CONFIG_NO_HZ */
107
108static inline void exit_rcu(void)
109{
110}
111
112static inline int rcu_preempt_depth(void)
113{
114 return 0;
115}
116
117#endif /* __LINUX_RCUTINY_H */