Paul E. McKenney | 9b1d82f | 2009-10-25 19:03:50 -0700 | [diff] [blame^] | 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 - |
| 23 | * Documentation/RCU |
| 24 | */ |
| 25 | |
| 26 | #ifndef __LINUX_TINY_H |
| 27 | #define __LINUX_TINY_H |
| 28 | |
| 29 | #include <linux/cache.h> |
| 30 | |
| 31 | void rcu_sched_qs(int cpu); |
| 32 | void rcu_bh_qs(int cpu); |
| 33 | |
| 34 | #define __rcu_read_lock() preempt_disable() |
| 35 | #define __rcu_read_unlock() preempt_enable() |
| 36 | #define __rcu_read_lock_bh() local_bh_disable() |
| 37 | #define __rcu_read_unlock_bh() local_bh_enable() |
| 38 | #define call_rcu_sched call_rcu |
| 39 | |
| 40 | #define rcu_init_sched() do { } while (0) |
| 41 | extern void rcu_check_callbacks(int cpu, int user); |
| 42 | extern void __rcu_init(void); |
| 43 | |
| 44 | /* |
| 45 | * Return the number of grace periods. |
| 46 | */ |
| 47 | static inline long rcu_batches_completed(void) |
| 48 | { |
| 49 | return 0; |
| 50 | } |
| 51 | |
| 52 | /* |
| 53 | * Return the number of bottom-half grace periods. |
| 54 | */ |
| 55 | static inline long rcu_batches_completed_bh(void) |
| 56 | { |
| 57 | return 0; |
| 58 | } |
| 59 | |
| 60 | extern int rcu_expedited_torture_stats(char *page); |
| 61 | |
| 62 | static inline void synchronize_rcu_expedited(void) |
| 63 | { |
| 64 | synchronize_sched(); |
| 65 | } |
| 66 | |
| 67 | static inline void synchronize_rcu_bh_expedited(void) |
| 68 | { |
| 69 | synchronize_sched(); |
| 70 | } |
| 71 | |
| 72 | struct notifier_block; |
| 73 | extern int rcu_cpu_notify(struct notifier_block *self, |
| 74 | unsigned long action, void *hcpu); |
| 75 | |
| 76 | #ifdef CONFIG_NO_HZ |
| 77 | |
| 78 | extern void rcu_enter_nohz(void); |
| 79 | extern void rcu_exit_nohz(void); |
| 80 | |
| 81 | #else /* #ifdef CONFIG_NO_HZ */ |
| 82 | |
| 83 | static inline void rcu_enter_nohz(void) |
| 84 | { |
| 85 | } |
| 86 | |
| 87 | static inline void rcu_exit_nohz(void) |
| 88 | { |
| 89 | } |
| 90 | |
| 91 | #endif /* #else #ifdef CONFIG_NO_HZ */ |
| 92 | |
| 93 | static inline void exit_rcu(void) |
| 94 | { |
| 95 | } |
| 96 | |
| 97 | #endif /* __LINUX_RCUTINY_H */ |