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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 | ||
965a002b | 30 | #ifdef CONFIG_RCU_BOOST |
b2c0710c PM |
31 | static inline void rcu_init(void) |
32 | { | |
33 | } | |
965a002b PM |
34 | #else /* #ifdef CONFIG_RCU_BOOST */ |
35 | void rcu_init(void); | |
36 | #endif /* #else #ifdef CONFIG_RCU_BOOST */ | |
9b1d82fa | 37 | |
2c42818e PM |
38 | static inline void rcu_barrier_bh(void) |
39 | { | |
40 | wait_rcu_gp(call_rcu_bh); | |
41 | } | |
42 | ||
43 | static inline void rcu_barrier_sched(void) | |
44 | { | |
45 | wait_rcu_gp(call_rcu_sched); | |
46 | } | |
47 | ||
a57eb940 | 48 | #ifdef CONFIG_TINY_RCU |
9b1d82fa | 49 | |
a57eb940 | 50 | static inline void synchronize_rcu_expedited(void) |
bf66f18e | 51 | { |
a57eb940 | 52 | synchronize_sched(); /* Only one CPU, so pretty fast anyway!!! */ |
bf66f18e PM |
53 | } |
54 | ||
a57eb940 | 55 | static inline void rcu_barrier(void) |
bf66f18e | 56 | { |
a57eb940 | 57 | rcu_barrier_sched(); /* Only one CPU, so only one list of callbacks! */ |
bf66f18e PM |
58 | } |
59 | ||
a57eb940 | 60 | #else /* #ifdef CONFIG_TINY_RCU */ |
da848c47 | 61 | |
a57eb940 | 62 | void synchronize_rcu_expedited(void); |
da848c47 | 63 | |
2c42818e PM |
64 | static inline void rcu_barrier(void) |
65 | { | |
66 | wait_rcu_gp(call_rcu); | |
67 | } | |
68 | ||
a57eb940 | 69 | #endif /* #else #ifdef CONFIG_TINY_RCU */ |
6ebb237b | 70 | |
a57eb940 | 71 | static inline void synchronize_rcu_bh(void) |
9b1d82fa PM |
72 | { |
73 | synchronize_sched(); | |
74 | } | |
75 | ||
76 | static inline void synchronize_rcu_bh_expedited(void) | |
77 | { | |
78 | synchronize_sched(); | |
79 | } | |
80 | ||
7b27d547 LJ |
81 | static inline void synchronize_sched_expedited(void) |
82 | { | |
83 | synchronize_sched(); | |
84 | } | |
85 | ||
a57eb940 PM |
86 | #ifdef CONFIG_TINY_RCU |
87 | ||
88 | static inline void rcu_preempt_note_context_switch(void) | |
89 | { | |
90 | } | |
91 | ||
9b1d82fa PM |
92 | static inline void exit_rcu(void) |
93 | { | |
94 | } | |
95 | ||
a57eb940 PM |
96 | static inline int rcu_needs_cpu(int cpu) |
97 | { | |
98 | return 0; | |
99 | } | |
100 | ||
a57eb940 PM |
101 | #else /* #ifdef CONFIG_TINY_RCU */ |
102 | ||
103 | void rcu_preempt_note_context_switch(void); | |
104 | extern void exit_rcu(void); | |
105 | int rcu_preempt_needs_cpu(void); | |
106 | ||
107 | static inline int rcu_needs_cpu(int cpu) | |
108 | { | |
109 | return rcu_preempt_needs_cpu(); | |
110 | } | |
111 | ||
a57eb940 PM |
112 | #endif /* #else #ifdef CONFIG_TINY_RCU */ |
113 | ||
114 | static inline void rcu_note_context_switch(int cpu) | |
115 | { | |
116 | rcu_sched_qs(cpu); | |
117 | rcu_preempt_note_context_switch(); | |
118 | } | |
119 | ||
29ce8310 GN |
120 | /* |
121 | * Take advantage of the fact that there is only one CPU, which | |
122 | * allows us to ignore virtualization-based context switches. | |
123 | */ | |
124 | static inline void rcu_virt_note_context_switch(int cpu) | |
125 | { | |
126 | } | |
127 | ||
a57eb940 PM |
128 | /* |
129 | * Return the number of grace periods. | |
130 | */ | |
131 | static inline long rcu_batches_completed(void) | |
132 | { | |
133 | return 0; | |
134 | } | |
135 | ||
136 | /* | |
137 | * Return the number of bottom-half grace periods. | |
138 | */ | |
139 | static inline long rcu_batches_completed_bh(void) | |
140 | { | |
141 | return 0; | |
142 | } | |
143 | ||
144 | static inline void rcu_force_quiescent_state(void) | |
145 | { | |
146 | } | |
147 | ||
148 | static inline void rcu_bh_force_quiescent_state(void) | |
149 | { | |
150 | } | |
151 | ||
152 | static inline void rcu_sched_force_quiescent_state(void) | |
153 | { | |
154 | } | |
155 | ||
53d84e00 PM |
156 | static inline void rcu_cpu_stall_reset(void) |
157 | { | |
158 | } | |
159 | ||
bbad9379 | 160 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
bbad9379 PM |
161 | extern int rcu_scheduler_active __read_mostly; |
162 | extern void rcu_scheduler_starting(void); | |
bbad9379 | 163 | #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */ |
bbad9379 PM |
164 | static inline void rcu_scheduler_starting(void) |
165 | { | |
166 | } | |
bbad9379 PM |
167 | #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */ |
168 | ||
9b1d82fa | 169 | #endif /* __LINUX_RCUTINY_H */ |