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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 | ||
b8c17e66 PM |
36 | static inline bool rcu_eqs_special_set(int cpu) |
37 | { | |
38 | return false; /* Never flag non-existent other CPUs! */ | |
39 | } | |
40 | ||
765a3f4f PM |
41 | static inline unsigned long get_state_synchronize_rcu(void) |
42 | { | |
43 | return 0; | |
44 | } | |
45 | ||
46 | static inline void cond_synchronize_rcu(unsigned long oldstate) | |
47 | { | |
48 | might_sleep(); | |
49 | } | |
50 | ||
24560056 PM |
51 | static inline unsigned long get_state_synchronize_sched(void) |
52 | { | |
53 | return 0; | |
54 | } | |
55 | ||
56 | static inline void cond_synchronize_sched(unsigned long oldstate) | |
57 | { | |
58 | might_sleep(); | |
59 | } | |
60 | ||
f9411ebe IM |
61 | extern void rcu_barrier_bh(void); |
62 | extern void rcu_barrier_sched(void); | |
2c42818e | 63 | |
a57eb940 | 64 | static inline void synchronize_rcu_expedited(void) |
bf66f18e | 65 | { |
a57eb940 | 66 | synchronize_sched(); /* Only one CPU, so pretty fast anyway!!! */ |
bf66f18e PM |
67 | } |
68 | ||
a57eb940 | 69 | static inline void rcu_barrier(void) |
bf66f18e | 70 | { |
a57eb940 | 71 | rcu_barrier_sched(); /* Only one CPU, so only one list of callbacks! */ |
bf66f18e PM |
72 | } |
73 | ||
a57eb940 | 74 | static inline void synchronize_rcu_bh(void) |
9b1d82fa PM |
75 | { |
76 | synchronize_sched(); | |
77 | } | |
78 | ||
79 | static inline void synchronize_rcu_bh_expedited(void) | |
80 | { | |
81 | synchronize_sched(); | |
82 | } | |
83 | ||
7b27d547 LJ |
84 | static inline void synchronize_sched_expedited(void) |
85 | { | |
86 | synchronize_sched(); | |
87 | } | |
88 | ||
486e2593 | 89 | static inline void kfree_call_rcu(struct rcu_head *head, |
b6a4ae76 | 90 | rcu_callback_t func) |
486e2593 PM |
91 | { |
92 | call_rcu(head, func); | |
93 | } | |
94 | ||
bcbfdd01 PM |
95 | #define rcu_note_context_switch(preempt) \ |
96 | do { \ | |
97 | rcu_sched_qs(); \ | |
98 | rcu_note_voluntary_context_switch_lite(current); \ | |
99 | } while (0) | |
a57eb940 | 100 | |
29ce8310 GN |
101 | /* |
102 | * Take advantage of the fact that there is only one CPU, which | |
103 | * allows us to ignore virtualization-based context switches. | |
104 | */ | |
105 | static inline void rcu_virt_note_context_switch(int cpu) | |
106 | { | |
107 | } | |
108 | ||
a57eb940 | 109 | /* |
917963d0 | 110 | * Return the number of grace periods started. |
a57eb940 | 111 | */ |
917963d0 | 112 | static inline unsigned long rcu_batches_started(void) |
a57eb940 PM |
113 | { |
114 | return 0; | |
115 | } | |
116 | ||
117 | /* | |
917963d0 | 118 | * Return the number of bottom-half grace periods started. |
a57eb940 | 119 | */ |
917963d0 PM |
120 | static inline unsigned long rcu_batches_started_bh(void) |
121 | { | |
122 | return 0; | |
123 | } | |
124 | ||
125 | /* | |
126 | * Return the number of sched grace periods started. | |
127 | */ | |
128 | static inline unsigned long rcu_batches_started_sched(void) | |
129 | { | |
130 | return 0; | |
131 | } | |
132 | ||
133 | /* | |
134 | * Return the number of grace periods completed. | |
a57eb940 | 135 | */ |
9733e4f0 | 136 | static inline unsigned long rcu_batches_completed(void) |
a57eb940 PM |
137 | { |
138 | return 0; | |
139 | } | |
140 | ||
141 | /* | |
917963d0 | 142 | * Return the number of bottom-half grace periods completed. |
a57eb940 | 143 | */ |
9733e4f0 | 144 | static inline unsigned long rcu_batches_completed_bh(void) |
a57eb940 PM |
145 | { |
146 | return 0; | |
147 | } | |
148 | ||
c1fe9cde | 149 | /* |
917963d0 | 150 | * Return the number of sched grace periods completed. |
c1fe9cde PM |
151 | */ |
152 | static inline unsigned long rcu_batches_completed_sched(void) | |
a57eb940 PM |
153 | { |
154 | return 0; | |
155 | } | |
156 | ||
291783b8 PM |
157 | /* |
158 | * Return the number of expedited grace periods completed. | |
159 | */ | |
160 | static inline unsigned long rcu_exp_batches_completed(void) | |
161 | { | |
162 | return 0; | |
163 | } | |
164 | ||
165 | /* | |
166 | * Return the number of expedited sched grace periods completed. | |
167 | */ | |
168 | static inline unsigned long rcu_exp_batches_completed_sched(void) | |
169 | { | |
170 | return 0; | |
171 | } | |
172 | ||
a57eb940 PM |
173 | static inline void rcu_force_quiescent_state(void) |
174 | { | |
175 | } | |
176 | ||
177 | static inline void rcu_bh_force_quiescent_state(void) | |
178 | { | |
179 | } | |
180 | ||
181 | static inline void rcu_sched_force_quiescent_state(void) | |
182 | { | |
183 | } | |
184 | ||
afea227f PM |
185 | static inline void show_rcu_gp_kthreads(void) |
186 | { | |
187 | } | |
188 | ||
53d84e00 PM |
189 | static inline void rcu_cpu_stall_reset(void) |
190 | { | |
191 | } | |
192 | ||
51952bc6 PM |
193 | static inline void rcu_idle_enter(void) |
194 | { | |
195 | } | |
196 | ||
197 | static inline void rcu_idle_exit(void) | |
198 | { | |
199 | } | |
200 | ||
201 | static inline void rcu_irq_enter(void) | |
202 | { | |
203 | } | |
204 | ||
7c9906ca PM |
205 | static inline void rcu_irq_exit_irqson(void) |
206 | { | |
207 | } | |
208 | ||
209 | static inline void rcu_irq_enter_irqson(void) | |
210 | { | |
211 | } | |
212 | ||
51952bc6 PM |
213 | static inline void rcu_irq_exit(void) |
214 | { | |
215 | } | |
216 | ||
2439b696 PM |
217 | static inline void exit_rcu(void) |
218 | { | |
219 | } | |
220 | ||
900b1028 | 221 | #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU) |
bbad9379 | 222 | extern int rcu_scheduler_active __read_mostly; |
584dc4ce | 223 | void rcu_scheduler_starting(void); |
900b1028 | 224 | #else /* #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU) */ |
bbad9379 PM |
225 | static inline void rcu_scheduler_starting(void) |
226 | { | |
227 | } | |
900b1028 | 228 | #endif /* #else #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU) */ |
bbad9379 | 229 | |
5c173eb8 | 230 | #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) |
cc6783f7 | 231 | |
5c173eb8 | 232 | static inline bool rcu_is_watching(void) |
cc6783f7 | 233 | { |
5c173eb8 | 234 | return __rcu_is_watching(); |
cc6783f7 PM |
235 | } |
236 | ||
5c173eb8 PM |
237 | #else /* defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) */ |
238 | ||
239 | static inline bool rcu_is_watching(void) | |
240 | { | |
241 | return true; | |
242 | } | |
243 | ||
5c173eb8 | 244 | #endif /* #else defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) */ |
cc6783f7 | 245 | |
bcbfdd01 PM |
246 | static inline void rcu_request_urgent_qs_task(struct task_struct *t) |
247 | { | |
248 | } | |
249 | ||
5cd37193 PM |
250 | static inline void rcu_all_qs(void) |
251 | { | |
bb73c52b | 252 | barrier(); /* Avoid RCU read-side critical sections leaking across. */ |
5cd37193 PM |
253 | } |
254 | ||
4df83742 TG |
255 | /* RCUtree hotplug events */ |
256 | #define rcutree_prepare_cpu NULL | |
257 | #define rcutree_online_cpu NULL | |
258 | #define rcutree_offline_cpu NULL | |
259 | #define rcutree_dead_cpu NULL | |
260 | #define rcutree_dying_cpu NULL | |
261 | ||
9b1d82fa | 262 | #endif /* __LINUX_RCUTINY_H */ |