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| Rev | Author | Line No. | Line |
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| 5270 | serge | 1 | /* |
| 2 | * Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition. |
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| 3 | * |
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| 4 | * This program is free software; you can redistribute it and/or modify |
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| 5 | * it under the terms of the GNU General Public License as published by |
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| 6 | * the Free Software Foundation; either version 2 of the License, or |
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| 7 | * (at your option) any later version. |
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| 8 | * |
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| 9 | * This program is distributed in the hope that it will be useful, |
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| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 12 | * GNU General Public License for more details. |
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| 13 | * |
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| 14 | * You should have received a copy of the GNU General Public License |
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| 15 | * along with this program; if not, you can access it online at |
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| 16 | * http://www.gnu.org/licenses/gpl-2.0.html. |
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| 17 | * |
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| 18 | * Copyright IBM Corporation, 2008 |
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| 19 | * |
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| 20 | * Author: Paul E. McKenney |
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| 21 | * |
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| 22 | * For detailed explanation of Read-Copy Update mechanism see - |
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| 23 | * Documentation/RCU |
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| 24 | */ |
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| 25 | #ifndef __LINUX_TINY_H |
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| 26 | #define __LINUX_TINY_H |
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| 27 | |||
| 28 | #include |
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| 29 | |||
| 30 | static inline unsigned long get_state_synchronize_rcu(void) |
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| 31 | { |
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| 32 | return 0; |
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| 33 | } |
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| 34 | |||
| 35 | static inline void cond_synchronize_rcu(unsigned long oldstate) |
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| 36 | { |
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| 37 | might_sleep(); |
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| 38 | } |
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| 39 | |||
| 40 | static inline void rcu_barrier_bh(void) |
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| 41 | { |
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| 42 | wait_rcu_gp(call_rcu_bh); |
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| 43 | } |
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| 44 | |||
| 45 | static inline void rcu_barrier_sched(void) |
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| 46 | { |
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| 47 | wait_rcu_gp(call_rcu_sched); |
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| 48 | } |
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| 49 | |||
| 50 | static inline void synchronize_rcu_expedited(void) |
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| 51 | { |
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| 52 | synchronize_sched(); /* Only one CPU, so pretty fast anyway!!! */ |
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| 53 | } |
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| 54 | |||
| 55 | static inline void rcu_barrier(void) |
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| 56 | { |
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| 57 | rcu_barrier_sched(); /* Only one CPU, so only one list of callbacks! */ |
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| 58 | } |
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| 59 | |||
| 60 | static inline void synchronize_rcu_bh(void) |
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| 61 | { |
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| 62 | synchronize_sched(); |
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| 63 | } |
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| 64 | |||
| 65 | static inline void synchronize_rcu_bh_expedited(void) |
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| 66 | { |
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| 67 | synchronize_sched(); |
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| 68 | } |
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| 69 | |||
| 70 | static inline void synchronize_sched_expedited(void) |
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| 71 | { |
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| 72 | synchronize_sched(); |
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| 73 | } |
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| 74 | |||
| 75 | static inline void kfree_call_rcu(struct rcu_head *head, |
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| 76 | void (*func)(struct rcu_head *rcu)) |
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| 77 | { |
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| 78 | call_rcu(head, func); |
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| 79 | } |
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| 80 | |||
| 81 | static inline void rcu_note_context_switch(void) |
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| 82 | { |
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| 83 | rcu_sched_qs(); |
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| 84 | } |
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| 85 | |||
| 86 | /* |
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| 87 | * Take advantage of the fact that there is only one CPU, which |
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| 88 | * allows us to ignore virtualization-based context switches. |
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| 89 | */ |
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| 90 | static inline void rcu_virt_note_context_switch(int cpu) |
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| 91 | { |
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| 92 | } |
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| 93 | |||
| 94 | /* |
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| 6082 | serge | 95 | * Return the number of grace periods started. |
| 5270 | serge | 96 | */ |
| 6082 | serge | 97 | static inline unsigned long rcu_batches_started(void) |
| 5270 | serge | 98 | { |
| 99 | return 0; |
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| 100 | } |
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| 101 | |||
| 102 | /* |
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| 6082 | serge | 103 | * Return the number of bottom-half grace periods started. |
| 5270 | serge | 104 | */ |
| 6082 | serge | 105 | static inline unsigned long rcu_batches_started_bh(void) |
| 5270 | serge | 106 | { |
| 107 | return 0; |
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| 108 | } |
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| 109 | |||
| 6082 | serge | 110 | /* |
| 111 | * Return the number of sched grace periods started. |
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| 112 | */ |
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| 113 | static inline unsigned long rcu_batches_started_sched(void) |
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| 114 | { |
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| 115 | return 0; |
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| 116 | } |
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| 117 | |||
| 118 | /* |
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| 119 | * Return the number of grace periods completed. |
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| 120 | */ |
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| 121 | static inline unsigned long rcu_batches_completed(void) |
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| 122 | { |
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| 123 | return 0; |
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| 124 | } |
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| 125 | |||
| 126 | /* |
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| 127 | * Return the number of bottom-half grace periods completed. |
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| 128 | */ |
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| 129 | static inline unsigned long rcu_batches_completed_bh(void) |
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| 130 | { |
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| 131 | return 0; |
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| 132 | } |
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| 133 | |||
| 134 | /* |
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| 135 | * Return the number of sched grace periods completed. |
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| 136 | */ |
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| 137 | static inline unsigned long rcu_batches_completed_sched(void) |
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| 138 | { |
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| 139 | return 0; |
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| 140 | } |
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| 141 | |||
| 5270 | serge | 142 | static inline void rcu_force_quiescent_state(void) |
| 143 | { |
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| 144 | } |
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| 145 | |||
| 146 | static inline void rcu_bh_force_quiescent_state(void) |
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| 147 | { |
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| 148 | } |
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| 149 | |||
| 150 | static inline void rcu_sched_force_quiescent_state(void) |
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| 151 | { |
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| 152 | } |
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| 153 | |||
| 154 | static inline void show_rcu_gp_kthreads(void) |
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| 155 | { |
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| 156 | } |
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| 157 | |||
| 158 | static inline void rcu_cpu_stall_reset(void) |
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| 159 | { |
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| 160 | } |
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| 161 | |||
| 6082 | serge | 162 | static inline void rcu_idle_enter(void) |
| 163 | { |
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| 164 | } |
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| 165 | |||
| 166 | static inline void rcu_idle_exit(void) |
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| 167 | { |
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| 168 | } |
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| 169 | |||
| 170 | static inline void rcu_irq_enter(void) |
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| 171 | { |
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| 172 | } |
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| 173 | |||
| 174 | static inline void rcu_irq_exit(void) |
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| 175 | { |
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| 176 | } |
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| 177 | |||
| 5270 | serge | 178 | static inline void exit_rcu(void) |
| 179 | { |
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| 180 | } |
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| 181 | |||
| 182 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
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| 183 | extern int rcu_scheduler_active __read_mostly; |
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| 184 | void rcu_scheduler_starting(void); |
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| 185 | #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */ |
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| 186 | static inline void rcu_scheduler_starting(void) |
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| 187 | { |
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| 188 | } |
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| 189 | #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */ |
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| 190 | |||
| 191 | #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) |
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| 192 | |||
| 193 | static inline bool rcu_is_watching(void) |
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| 194 | { |
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| 195 | return __rcu_is_watching(); |
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| 196 | } |
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| 197 | |||
| 198 | #else /* defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) */ |
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| 199 | |||
| 200 | static inline bool rcu_is_watching(void) |
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| 201 | { |
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| 202 | return true; |
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| 203 | } |
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| 204 | |||
| 205 | #endif /* #else defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) */ |
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| 206 | |||
| 6082 | serge | 207 | static inline void rcu_all_qs(void) |
| 208 | { |
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| 209 | } |
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| 210 | |||
| 5270 | serge | 211 | #endif /* __LINUX_RCUTINY_H */ |