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9b1d82fa PM |
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 - | |
4ce5b903 | 23 | * Documentation/RCU |
9b1d82fa | 24 | */ |
9b1d82fa PM |
25 | #ifndef __LINUX_TINY_H |
26 | #define __LINUX_TINY_H | |
27 | ||
28 | #include <linux/cache.h> | |
29 | ||
30 | void rcu_sched_qs(int cpu); | |
31 | void rcu_bh_qs(int cpu); | |
25502a6c PM |
32 | static inline void rcu_note_context_switch(int cpu) |
33 | { | |
34 | rcu_sched_qs(cpu); | |
35 | } | |
9b1d82fa PM |
36 | |
37 | #define __rcu_read_lock() preempt_disable() | |
38 | #define __rcu_read_unlock() preempt_enable() | |
39 | #define __rcu_read_lock_bh() local_bh_disable() | |
40 | #define __rcu_read_unlock_bh() local_bh_enable() | |
41 | #define call_rcu_sched call_rcu | |
42 | ||
43 | #define rcu_init_sched() do { } while (0) | |
44 | extern void rcu_check_callbacks(int cpu, int user); | |
9b1d82fa | 45 | |
6ebb237b PM |
46 | static inline int rcu_needs_cpu(int cpu) |
47 | { | |
48 | return 0; | |
49 | } | |
50 | ||
9b1d82fa PM |
51 | /* |
52 | * Return the number of grace periods. | |
53 | */ | |
54 | static inline long rcu_batches_completed(void) | |
55 | { | |
56 | return 0; | |
57 | } | |
58 | ||
59 | /* | |
60 | * Return the number of bottom-half grace periods. | |
61 | */ | |
62 | static inline long rcu_batches_completed_bh(void) | |
63 | { | |
64 | return 0; | |
65 | } | |
66 | ||
bf66f18e PM |
67 | static inline void rcu_force_quiescent_state(void) |
68 | { | |
69 | } | |
70 | ||
71 | static inline void rcu_bh_force_quiescent_state(void) | |
72 | { | |
73 | } | |
74 | ||
75 | static inline void rcu_sched_force_quiescent_state(void) | |
76 | { | |
77 | } | |
78 | ||
da848c47 PM |
79 | extern void synchronize_sched(void); |
80 | ||
81 | static inline void synchronize_rcu(void) | |
82 | { | |
83 | synchronize_sched(); | |
84 | } | |
85 | ||
86 | static inline void synchronize_rcu_bh(void) | |
87 | { | |
88 | synchronize_sched(); | |
89 | } | |
6ebb237b | 90 | |
9b1d82fa PM |
91 | static inline void synchronize_rcu_expedited(void) |
92 | { | |
93 | synchronize_sched(); | |
94 | } | |
95 | ||
96 | static inline void synchronize_rcu_bh_expedited(void) | |
97 | { | |
98 | synchronize_sched(); | |
99 | } | |
100 | ||
101 | struct notifier_block; | |
9b1d82fa PM |
102 | |
103 | #ifdef CONFIG_NO_HZ | |
104 | ||
105 | extern void rcu_enter_nohz(void); | |
106 | extern void rcu_exit_nohz(void); | |
107 | ||
108 | #else /* #ifdef CONFIG_NO_HZ */ | |
109 | ||
110 | static inline void rcu_enter_nohz(void) | |
111 | { | |
112 | } | |
113 | ||
114 | static inline void rcu_exit_nohz(void) | |
115 | { | |
116 | } | |
117 | ||
118 | #endif /* #else #ifdef CONFIG_NO_HZ */ | |
119 | ||
120 | static inline void exit_rcu(void) | |
121 | { | |
122 | } | |
123 | ||
234da7bc FW |
124 | static inline int rcu_preempt_depth(void) |
125 | { | |
126 | return 0; | |
127 | } | |
128 | ||
bbad9379 PM |
129 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
130 | ||
131 | extern int rcu_scheduler_active __read_mostly; | |
132 | extern void rcu_scheduler_starting(void); | |
133 | ||
134 | #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */ | |
135 | ||
136 | static inline void rcu_scheduler_starting(void) | |
137 | { | |
138 | } | |
139 | ||
140 | #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */ | |
141 | ||
9b1d82fa | 142 | #endif /* __LINUX_RCUTINY_H */ |