Linux kernel mirror (for testing)
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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
30#define rcu_init_sched() do { } while (0)
31
32#ifdef CONFIG_TINY_RCU
33
34static inline void synchronize_rcu_expedited(void)
35{
36 synchronize_sched(); /* Only one CPU, so pretty fast anyway!!! */
37}
38
39static inline void rcu_barrier(void)
40{
41 rcu_barrier_sched(); /* Only one CPU, so only one list of callbacks! */
42}
43
44#else /* #ifdef CONFIG_TINY_RCU */
45
46void rcu_barrier(void);
47void synchronize_rcu_expedited(void);
48
49#endif /* #else #ifdef CONFIG_TINY_RCU */
50
51static inline void synchronize_rcu_bh(void)
52{
53 synchronize_sched();
54}
55
56static inline void synchronize_rcu_bh_expedited(void)
57{
58 synchronize_sched();
59}
60
61#ifdef CONFIG_TINY_RCU
62
63static inline void rcu_preempt_note_context_switch(void)
64{
65}
66
67static inline void exit_rcu(void)
68{
69}
70
71static inline int rcu_needs_cpu(int cpu)
72{
73 return 0;
74}
75
76#else /* #ifdef CONFIG_TINY_RCU */
77
78void rcu_preempt_note_context_switch(void);
79extern void exit_rcu(void);
80int rcu_preempt_needs_cpu(void);
81
82static inline int rcu_needs_cpu(int cpu)
83{
84 return rcu_preempt_needs_cpu();
85}
86
87#endif /* #else #ifdef CONFIG_TINY_RCU */
88
89static inline void rcu_note_context_switch(int cpu)
90{
91 rcu_sched_qs(cpu);
92 rcu_preempt_note_context_switch();
93}
94
95/*
96 * Return the number of grace periods.
97 */
98static inline long rcu_batches_completed(void)
99{
100 return 0;
101}
102
103/*
104 * Return the number of bottom-half grace periods.
105 */
106static inline long rcu_batches_completed_bh(void)
107{
108 return 0;
109}
110
111static inline void rcu_force_quiescent_state(void)
112{
113}
114
115static inline void rcu_bh_force_quiescent_state(void)
116{
117}
118
119static inline void rcu_sched_force_quiescent_state(void)
120{
121}
122
123static inline void rcu_cpu_stall_reset(void)
124{
125}
126
127#ifdef CONFIG_DEBUG_LOCK_ALLOC
128
129extern int rcu_scheduler_active __read_mostly;
130extern void rcu_scheduler_starting(void);
131
132#else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
133
134static inline void rcu_scheduler_starting(void)
135{
136}
137
138#endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
139
140#endif /* __LINUX_RCUTINY_H */