Commit | Line | Data |
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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 | |
87de1cfd PM |
15 | * along with this program; if not, you can access it online at |
16 | * http://www.gnu.org/licenses/gpl-2.0.html. | |
9b1d82fa PM |
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 | ||
765a3f4f PM |
30 | static inline unsigned long get_state_synchronize_rcu(void) |
31 | { | |
32 | return 0; | |
33 | } | |
34 | ||
35 | static inline void cond_synchronize_rcu(unsigned long oldstate) | |
36 | { | |
37 | might_sleep(); | |
38 | } | |
39 | ||
24560056 PM |
40 | static inline unsigned long get_state_synchronize_sched(void) |
41 | { | |
42 | return 0; | |
43 | } | |
44 | ||
45 | static inline void cond_synchronize_sched(unsigned long oldstate) | |
46 | { | |
47 | might_sleep(); | |
48 | } | |
49 | ||
2c42818e PM |
50 | static inline void rcu_barrier_bh(void) |
51 | { | |
52 | wait_rcu_gp(call_rcu_bh); | |
53 | } | |
54 | ||
55 | static inline void rcu_barrier_sched(void) | |
56 | { | |
57 | wait_rcu_gp(call_rcu_sched); | |
58 | } | |
59 | ||
a57eb940 | 60 | static inline void synchronize_rcu_expedited(void) |
bf66f18e | 61 | { |
a57eb940 | 62 | synchronize_sched(); /* Only one CPU, so pretty fast anyway!!! */ |
bf66f18e PM |
63 | } |
64 | ||
a57eb940 | 65 | static inline void rcu_barrier(void) |
bf66f18e | 66 | { |
a57eb940 | 67 | rcu_barrier_sched(); /* Only one CPU, so only one list of callbacks! */ |
bf66f18e PM |
68 | } |
69 | ||
a57eb940 | 70 | static inline void synchronize_rcu_bh(void) |
9b1d82fa PM |
71 | { |
72 | synchronize_sched(); | |
73 | } | |
74 | ||
75 | static inline void synchronize_rcu_bh_expedited(void) | |
76 | { | |
77 | synchronize_sched(); | |
78 | } | |
79 | ||
7b27d547 LJ |
80 | static inline void synchronize_sched_expedited(void) |
81 | { | |
82 | synchronize_sched(); | |
83 | } | |
84 | ||
486e2593 | 85 | static inline void kfree_call_rcu(struct rcu_head *head, |
b6a4ae76 | 86 | rcu_callback_t func) |
486e2593 PM |
87 | { |
88 | call_rcu(head, func); | |
89 | } | |
90 | ||
38200cf2 | 91 | static inline void rcu_note_context_switch(void) |
a57eb940 | 92 | { |
284a8c93 | 93 | rcu_sched_qs(); |
a57eb940 PM |
94 | } |
95 | ||
29ce8310 GN |
96 | /* |
97 | * Take advantage of the fact that there is only one CPU, which | |
98 | * allows us to ignore virtualization-based context switches. | |
99 | */ | |
100 | static inline void rcu_virt_note_context_switch(int cpu) | |
101 | { | |
102 | } | |
103 | ||
a57eb940 | 104 | /* |
917963d0 | 105 | * Return the number of grace periods started. |
a57eb940 | 106 | */ |
917963d0 | 107 | static inline unsigned long rcu_batches_started(void) |
a57eb940 PM |
108 | { |
109 | return 0; | |
110 | } | |
111 | ||
112 | /* | |
917963d0 | 113 | * Return the number of bottom-half grace periods started. |
a57eb940 | 114 | */ |
917963d0 PM |
115 | static inline unsigned long rcu_batches_started_bh(void) |
116 | { | |
117 | return 0; | |
118 | } | |
119 | ||
120 | /* | |
121 | * Return the number of sched grace periods started. | |
122 | */ | |
123 | static inline unsigned long rcu_batches_started_sched(void) | |
124 | { | |
125 | return 0; | |
126 | } | |
127 | ||
128 | /* | |
129 | * Return the number of grace periods completed. | |
a57eb940 | 130 | */ |
9733e4f0 | 131 | static inline unsigned long rcu_batches_completed(void) |
a57eb940 PM |
132 | { |
133 | return 0; | |
134 | } | |
135 | ||
136 | /* | |
917963d0 | 137 | * Return the number of bottom-half grace periods completed. |
a57eb940 | 138 | */ |
9733e4f0 | 139 | static inline unsigned long rcu_batches_completed_bh(void) |
a57eb940 PM |
140 | { |
141 | return 0; | |
142 | } | |
143 | ||
c1fe9cde | 144 | /* |
917963d0 | 145 | * Return the number of sched grace periods completed. |
c1fe9cde PM |
146 | */ |
147 | static inline unsigned long rcu_batches_completed_sched(void) | |
a57eb940 PM |
148 | { |
149 | return 0; | |
150 | } | |
151 | ||
152 | static inline void rcu_force_quiescent_state(void) | |
153 | { | |
154 | } | |
155 | ||
156 | static inline void rcu_bh_force_quiescent_state(void) | |
157 | { | |
158 | } | |
159 | ||
160 | static inline void rcu_sched_force_quiescent_state(void) | |
161 | { | |
162 | } | |
163 | ||
afea227f PM |
164 | static inline void show_rcu_gp_kthreads(void) |
165 | { | |
166 | } | |
167 | ||
53d84e00 PM |
168 | static inline void rcu_cpu_stall_reset(void) |
169 | { | |
170 | } | |
171 | ||
51952bc6 PM |
172 | static inline void rcu_idle_enter(void) |
173 | { | |
174 | } | |
175 | ||
176 | static inline void rcu_idle_exit(void) | |
177 | { | |
178 | } | |
179 | ||
180 | static inline void rcu_irq_enter(void) | |
181 | { | |
182 | } | |
183 | ||
7c9906ca PM |
184 | static inline void rcu_irq_exit_irqson(void) |
185 | { | |
186 | } | |
187 | ||
188 | static inline void rcu_irq_enter_irqson(void) | |
189 | { | |
190 | } | |
191 | ||
51952bc6 PM |
192 | static inline void rcu_irq_exit(void) |
193 | { | |
194 | } | |
195 | ||
2439b696 PM |
196 | static inline void exit_rcu(void) |
197 | { | |
198 | } | |
199 | ||
bbad9379 | 200 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
bbad9379 | 201 | extern int rcu_scheduler_active __read_mostly; |
584dc4ce | 202 | void rcu_scheduler_starting(void); |
bbad9379 | 203 | #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */ |
bbad9379 PM |
204 | static inline void rcu_scheduler_starting(void) |
205 | { | |
206 | } | |
bbad9379 PM |
207 | #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */ |
208 | ||
5c173eb8 | 209 | #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) |
cc6783f7 | 210 | |
5c173eb8 | 211 | static inline bool rcu_is_watching(void) |
cc6783f7 | 212 | { |
5c173eb8 | 213 | return __rcu_is_watching(); |
cc6783f7 PM |
214 | } |
215 | ||
5c173eb8 PM |
216 | #else /* defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) */ |
217 | ||
218 | static inline bool rcu_is_watching(void) | |
219 | { | |
220 | return true; | |
221 | } | |
222 | ||
5c173eb8 | 223 | #endif /* #else defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) */ |
cc6783f7 | 224 | |
5cd37193 PM |
225 | static inline void rcu_all_qs(void) |
226 | { | |
bb73c52b | 227 | barrier(); /* Avoid RCU read-side critical sections leaking across. */ |
5cd37193 PM |
228 | } |
229 | ||
9b1d82fa | 230 | #endif /* __LINUX_RCUTINY_H */ |