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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 | ||
02a5c550 PM |
30 | struct rcu_dynticks; |
31 | static inline int rcu_dynticks_snap(struct rcu_dynticks *rdtp) | |
32 | { | |
33 | return 0; | |
34 | } | |
35 | ||
765a3f4f PM |
36 | static inline unsigned long get_state_synchronize_rcu(void) |
37 | { | |
38 | return 0; | |
39 | } | |
40 | ||
41 | static inline void cond_synchronize_rcu(unsigned long oldstate) | |
42 | { | |
43 | might_sleep(); | |
44 | } | |
45 | ||
24560056 PM |
46 | static inline unsigned long get_state_synchronize_sched(void) |
47 | { | |
48 | return 0; | |
49 | } | |
50 | ||
51 | static inline void cond_synchronize_sched(unsigned long oldstate) | |
52 | { | |
53 | might_sleep(); | |
54 | } | |
55 | ||
2c42818e PM |
56 | static inline void rcu_barrier_bh(void) |
57 | { | |
58 | wait_rcu_gp(call_rcu_bh); | |
59 | } | |
60 | ||
61 | static inline void rcu_barrier_sched(void) | |
62 | { | |
63 | wait_rcu_gp(call_rcu_sched); | |
64 | } | |
65 | ||
a57eb940 | 66 | static inline void synchronize_rcu_expedited(void) |
bf66f18e | 67 | { |
a57eb940 | 68 | synchronize_sched(); /* Only one CPU, so pretty fast anyway!!! */ |
bf66f18e PM |
69 | } |
70 | ||
a57eb940 | 71 | static inline void rcu_barrier(void) |
bf66f18e | 72 | { |
a57eb940 | 73 | rcu_barrier_sched(); /* Only one CPU, so only one list of callbacks! */ |
bf66f18e PM |
74 | } |
75 | ||
a57eb940 | 76 | static inline void synchronize_rcu_bh(void) |
9b1d82fa PM |
77 | { |
78 | synchronize_sched(); | |
79 | } | |
80 | ||
81 | static inline void synchronize_rcu_bh_expedited(void) | |
82 | { | |
83 | synchronize_sched(); | |
84 | } | |
85 | ||
7b27d547 LJ |
86 | static inline void synchronize_sched_expedited(void) |
87 | { | |
88 | synchronize_sched(); | |
89 | } | |
90 | ||
486e2593 | 91 | static inline void kfree_call_rcu(struct rcu_head *head, |
b6a4ae76 | 92 | rcu_callback_t func) |
486e2593 PM |
93 | { |
94 | call_rcu(head, func); | |
95 | } | |
96 | ||
38200cf2 | 97 | static inline void rcu_note_context_switch(void) |
a57eb940 | 98 | { |
284a8c93 | 99 | rcu_sched_qs(); |
a57eb940 PM |
100 | } |
101 | ||
29ce8310 GN |
102 | /* |
103 | * Take advantage of the fact that there is only one CPU, which | |
104 | * allows us to ignore virtualization-based context switches. | |
105 | */ | |
106 | static inline void rcu_virt_note_context_switch(int cpu) | |
107 | { | |
108 | } | |
109 | ||
a57eb940 | 110 | /* |
917963d0 | 111 | * Return the number of grace periods started. |
a57eb940 | 112 | */ |
917963d0 | 113 | static inline unsigned long rcu_batches_started(void) |
a57eb940 PM |
114 | { |
115 | return 0; | |
116 | } | |
117 | ||
118 | /* | |
917963d0 | 119 | * Return the number of bottom-half grace periods started. |
a57eb940 | 120 | */ |
917963d0 PM |
121 | static inline unsigned long rcu_batches_started_bh(void) |
122 | { | |
123 | return 0; | |
124 | } | |
125 | ||
126 | /* | |
127 | * Return the number of sched grace periods started. | |
128 | */ | |
129 | static inline unsigned long rcu_batches_started_sched(void) | |
130 | { | |
131 | return 0; | |
132 | } | |
133 | ||
134 | /* | |
135 | * Return the number of grace periods completed. | |
a57eb940 | 136 | */ |
9733e4f0 | 137 | static inline unsigned long rcu_batches_completed(void) |
a57eb940 PM |
138 | { |
139 | return 0; | |
140 | } | |
141 | ||
142 | /* | |
917963d0 | 143 | * Return the number of bottom-half grace periods completed. |
a57eb940 | 144 | */ |
9733e4f0 | 145 | static inline unsigned long rcu_batches_completed_bh(void) |
a57eb940 PM |
146 | { |
147 | return 0; | |
148 | } | |
149 | ||
c1fe9cde | 150 | /* |
917963d0 | 151 | * Return the number of sched grace periods completed. |
c1fe9cde PM |
152 | */ |
153 | static inline unsigned long rcu_batches_completed_sched(void) | |
a57eb940 PM |
154 | { |
155 | return 0; | |
156 | } | |
157 | ||
291783b8 PM |
158 | /* |
159 | * Return the number of expedited grace periods completed. | |
160 | */ | |
161 | static inline unsigned long rcu_exp_batches_completed(void) | |
162 | { | |
163 | return 0; | |
164 | } | |
165 | ||
166 | /* | |
167 | * Return the number of expedited sched grace periods completed. | |
168 | */ | |
169 | static inline unsigned long rcu_exp_batches_completed_sched(void) | |
170 | { | |
171 | return 0; | |
172 | } | |
173 | ||
a57eb940 PM |
174 | static inline void rcu_force_quiescent_state(void) |
175 | { | |
176 | } | |
177 | ||
178 | static inline void rcu_bh_force_quiescent_state(void) | |
179 | { | |
180 | } | |
181 | ||
182 | static inline void rcu_sched_force_quiescent_state(void) | |
183 | { | |
184 | } | |
185 | ||
afea227f PM |
186 | static inline void show_rcu_gp_kthreads(void) |
187 | { | |
188 | } | |
189 | ||
53d84e00 PM |
190 | static inline void rcu_cpu_stall_reset(void) |
191 | { | |
192 | } | |
193 | ||
51952bc6 PM |
194 | static inline void rcu_idle_enter(void) |
195 | { | |
196 | } | |
197 | ||
198 | static inline void rcu_idle_exit(void) | |
199 | { | |
200 | } | |
201 | ||
202 | static inline void rcu_irq_enter(void) | |
203 | { | |
204 | } | |
205 | ||
7c9906ca PM |
206 | static inline void rcu_irq_exit_irqson(void) |
207 | { | |
208 | } | |
209 | ||
210 | static inline void rcu_irq_enter_irqson(void) | |
211 | { | |
212 | } | |
213 | ||
51952bc6 PM |
214 | static inline void rcu_irq_exit(void) |
215 | { | |
216 | } | |
217 | ||
2439b696 PM |
218 | static inline void exit_rcu(void) |
219 | { | |
220 | } | |
221 | ||
bbad9379 | 222 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
bbad9379 | 223 | extern int rcu_scheduler_active __read_mostly; |
584dc4ce | 224 | void rcu_scheduler_starting(void); |
bbad9379 | 225 | #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */ |
bbad9379 PM |
226 | static inline void rcu_scheduler_starting(void) |
227 | { | |
228 | } | |
bbad9379 PM |
229 | #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */ |
230 | ||
5c173eb8 | 231 | #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) |
cc6783f7 | 232 | |
5c173eb8 | 233 | static inline bool rcu_is_watching(void) |
cc6783f7 | 234 | { |
5c173eb8 | 235 | return __rcu_is_watching(); |
cc6783f7 PM |
236 | } |
237 | ||
5c173eb8 PM |
238 | #else /* defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) */ |
239 | ||
240 | static inline bool rcu_is_watching(void) | |
241 | { | |
242 | return true; | |
243 | } | |
244 | ||
5c173eb8 | 245 | #endif /* #else defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) */ |
cc6783f7 | 246 | |
5cd37193 PM |
247 | static inline void rcu_all_qs(void) |
248 | { | |
bb73c52b | 249 | barrier(); /* Avoid RCU read-side critical sections leaking across. */ |
5cd37193 PM |
250 | } |
251 | ||
4df83742 TG |
252 | /* RCUtree hotplug events */ |
253 | #define rcutree_prepare_cpu NULL | |
254 | #define rcutree_online_cpu NULL | |
255 | #define rcutree_offline_cpu NULL | |
256 | #define rcutree_dead_cpu NULL | |
257 | #define rcutree_dying_cpu NULL | |
258 | ||
9b1d82fa | 259 | #endif /* __LINUX_RCUTINY_H */ |