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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 | ||
b2c0710c PM |
30 | static inline void rcu_init(void) |
31 | { | |
32 | } | |
9b1d82fa | 33 | |
a57eb940 | 34 | #ifdef CONFIG_TINY_RCU |
9b1d82fa | 35 | |
a57eb940 | 36 | static inline void synchronize_rcu_expedited(void) |
bf66f18e | 37 | { |
a57eb940 | 38 | synchronize_sched(); /* Only one CPU, so pretty fast anyway!!! */ |
bf66f18e PM |
39 | } |
40 | ||
a57eb940 | 41 | static inline void rcu_barrier(void) |
bf66f18e | 42 | { |
a57eb940 | 43 | rcu_barrier_sched(); /* Only one CPU, so only one list of callbacks! */ |
bf66f18e PM |
44 | } |
45 | ||
a57eb940 | 46 | #else /* #ifdef CONFIG_TINY_RCU */ |
da848c47 | 47 | |
a57eb940 PM |
48 | void rcu_barrier(void); |
49 | void synchronize_rcu_expedited(void); | |
da848c47 | 50 | |
a57eb940 | 51 | #endif /* #else #ifdef CONFIG_TINY_RCU */ |
6ebb237b | 52 | |
a57eb940 | 53 | static inline void synchronize_rcu_bh(void) |
9b1d82fa PM |
54 | { |
55 | synchronize_sched(); | |
56 | } | |
57 | ||
58 | static inline void synchronize_rcu_bh_expedited(void) | |
59 | { | |
60 | synchronize_sched(); | |
61 | } | |
62 | ||
7b27d547 LJ |
63 | static inline void synchronize_sched_expedited(void) |
64 | { | |
65 | synchronize_sched(); | |
66 | } | |
67 | ||
a57eb940 PM |
68 | #ifdef CONFIG_TINY_RCU |
69 | ||
70 | static inline void rcu_preempt_note_context_switch(void) | |
71 | { | |
72 | } | |
73 | ||
9b1d82fa PM |
74 | static inline void exit_rcu(void) |
75 | { | |
76 | } | |
77 | ||
a57eb940 PM |
78 | static inline int rcu_needs_cpu(int cpu) |
79 | { | |
80 | return 0; | |
81 | } | |
82 | ||
a57eb940 PM |
83 | #else /* #ifdef CONFIG_TINY_RCU */ |
84 | ||
85 | void rcu_preempt_note_context_switch(void); | |
86 | extern void exit_rcu(void); | |
87 | int rcu_preempt_needs_cpu(void); | |
88 | ||
89 | static inline int rcu_needs_cpu(int cpu) | |
90 | { | |
91 | return rcu_preempt_needs_cpu(); | |
92 | } | |
93 | ||
a57eb940 PM |
94 | #endif /* #else #ifdef CONFIG_TINY_RCU */ |
95 | ||
96 | static inline void rcu_note_context_switch(int cpu) | |
97 | { | |
98 | rcu_sched_qs(cpu); | |
99 | rcu_preempt_note_context_switch(); | |
100 | } | |
101 | ||
a57eb940 PM |
102 | /* |
103 | * Return the number of grace periods. | |
104 | */ | |
105 | static inline long rcu_batches_completed(void) | |
106 | { | |
107 | return 0; | |
108 | } | |
109 | ||
110 | /* | |
111 | * Return the number of bottom-half grace periods. | |
112 | */ | |
113 | static inline long rcu_batches_completed_bh(void) | |
114 | { | |
115 | return 0; | |
116 | } | |
117 | ||
118 | static inline void rcu_force_quiescent_state(void) | |
119 | { | |
120 | } | |
121 | ||
122 | static inline void rcu_bh_force_quiescent_state(void) | |
123 | { | |
124 | } | |
125 | ||
126 | static inline void rcu_sched_force_quiescent_state(void) | |
127 | { | |
128 | } | |
129 | ||
53d84e00 PM |
130 | static inline void rcu_cpu_stall_reset(void) |
131 | { | |
132 | } | |
133 | ||
bbad9379 | 134 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
bbad9379 PM |
135 | extern int rcu_scheduler_active __read_mostly; |
136 | extern void rcu_scheduler_starting(void); | |
bbad9379 | 137 | #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */ |
bbad9379 PM |
138 | static inline void rcu_scheduler_starting(void) |
139 | { | |
140 | } | |
bbad9379 PM |
141 | #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */ |
142 | ||
9b1d82fa | 143 | #endif /* __LINUX_RCUTINY_H */ |