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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, you can access it online at
16 * http://www.gnu.org/licenses/gpl-2.0.html.
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
30static inline unsigned long get_state_synchronize_rcu(void)
31{
32 return 0;
33}
34
35static inline void cond_synchronize_rcu(unsigned long oldstate)
36{
37 might_sleep();
38}
39
40static inline void rcu_barrier_bh(void)
41{
42 wait_rcu_gp(call_rcu_bh);
43}
44
45static inline void rcu_barrier_sched(void)
46{
47 wait_rcu_gp(call_rcu_sched);
48}
49
50static inline void synchronize_rcu_expedited(void)
51{
52 synchronize_sched(); /* Only one CPU, so pretty fast anyway!!! */
53}
54
55static inline void rcu_barrier(void)
56{
57 rcu_barrier_sched(); /* Only one CPU, so only one list of callbacks! */
58}
59
60static inline void synchronize_rcu_bh(void)
61{
62 synchronize_sched();
63}
64
65static inline void synchronize_rcu_bh_expedited(void)
66{
67 synchronize_sched();
68}
69
70static inline void synchronize_sched_expedited(void)
71{
72 synchronize_sched();
73}
74
75static inline void kfree_call_rcu(struct rcu_head *head,
76 void (*func)(struct rcu_head *rcu))
77{
78 call_rcu(head, func);
79}
80
81static inline void rcu_note_context_switch(int cpu)
82{
83 rcu_sched_qs(cpu);
84}
85
86/*
87 * Take advantage of the fact that there is only one CPU, which
88 * allows us to ignore virtualization-based context switches.
89 */
90static inline void rcu_virt_note_context_switch(int cpu)
91{
92}
93
94/*
95 * Return the number of grace periods.
96 */
97static inline long rcu_batches_completed(void)
98{
99 return 0;
100}
101
102/*
103 * Return the number of bottom-half grace periods.
104 */
105static inline long rcu_batches_completed_bh(void)
106{
107 return 0;
108}
109
110static inline void rcu_force_quiescent_state(void)
111{
112}
113
114static inline void rcu_bh_force_quiescent_state(void)
115{
116}
117
118static inline void rcu_sched_force_quiescent_state(void)
119{
120}
121
122static inline void show_rcu_gp_kthreads(void)
123{
124}
125
126static inline void rcu_cpu_stall_reset(void)
127{
128}
129
130static inline void exit_rcu(void)
131{
132}
133
134#ifdef CONFIG_DEBUG_LOCK_ALLOC
135extern int rcu_scheduler_active __read_mostly;
136void rcu_scheduler_starting(void);
137#else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
138static inline void rcu_scheduler_starting(void)
139{
140}
141#endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
142
143#if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE)
144
145static inline bool rcu_is_watching(void)
146{
147 return __rcu_is_watching();
148}
149
150#else /* defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) */
151
152static inline bool rcu_is_watching(void)
153{
154 return true;
155}
156
157
158#endif /* #else defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) */
159
160#endif /* __LINUX_RCUTINY_H */