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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 | |
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 */ |