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64db4cff PM |
1 | /* |
2 | * Read-Copy Update mechanism for mutual exclusion (tree-based version) | |
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: Dipankar Sarma <dipankar@in.ibm.com> | |
21 | * Paul E. McKenney <paulmck@linux.vnet.ibm.com> Hierarchical algorithm | |
22 | * | |
23 | * Based on the original work by Paul McKenney <paulmck@us.ibm.com> | |
24 | * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen. | |
25 | * | |
26 | * For detailed explanation of Read-Copy Update mechanism see - | |
a71fca58 | 27 | * Documentation/RCU |
64db4cff PM |
28 | */ |
29 | ||
30 | #ifndef __LINUX_RCUTREE_H | |
31 | #define __LINUX_RCUTREE_H | |
32 | ||
9b2619af PM |
33 | struct notifier_block; |
34 | ||
d6714c22 PM |
35 | extern void rcu_sched_qs(int cpu); |
36 | extern void rcu_bh_qs(int cpu); | |
25502a6c | 37 | extern void rcu_note_context_switch(int cpu); |
64db4cff PM |
38 | extern int rcu_needs_cpu(int cpu); |
39 | ||
f41d911f PM |
40 | #ifdef CONFIG_TREE_PREEMPT_RCU |
41 | ||
42 | extern void __rcu_read_lock(void); | |
43 | extern void __rcu_read_unlock(void); | |
6ebb237b | 44 | extern void synchronize_rcu(void); |
f41d911f PM |
45 | extern void exit_rcu(void); |
46 | ||
234da7bc FW |
47 | /* |
48 | * Defined as macro as it is a very low level header | |
49 | * included from areas that don't even know about current | |
50 | */ | |
51 | #define rcu_preempt_depth() (current->rcu_read_lock_nesting) | |
52 | ||
f41d911f PM |
53 | #else /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
54 | ||
64db4cff PM |
55 | static inline void __rcu_read_lock(void) |
56 | { | |
57 | preempt_disable(); | |
64db4cff | 58 | } |
f41d911f | 59 | |
64db4cff PM |
60 | static inline void __rcu_read_unlock(void) |
61 | { | |
64db4cff PM |
62 | preempt_enable(); |
63 | } | |
f41d911f | 64 | |
6ebb237b | 65 | #define synchronize_rcu synchronize_sched |
16e30811 | 66 | |
f41d911f PM |
67 | static inline void exit_rcu(void) |
68 | { | |
69 | } | |
70 | ||
234da7bc FW |
71 | static inline int rcu_preempt_depth(void) |
72 | { | |
73 | return 0; | |
74 | } | |
75 | ||
f41d911f PM |
76 | #endif /* #else #ifdef CONFIG_TREE_PREEMPT_RCU */ |
77 | ||
64db4cff PM |
78 | static inline void __rcu_read_lock_bh(void) |
79 | { | |
80 | local_bh_disable(); | |
64db4cff PM |
81 | } |
82 | static inline void __rcu_read_unlock_bh(void) | |
83 | { | |
64db4cff PM |
84 | local_bh_enable(); |
85 | } | |
86 | ||
d6714c22 PM |
87 | extern void call_rcu_sched(struct rcu_head *head, |
88 | void (*func)(struct rcu_head *rcu)); | |
da848c47 PM |
89 | extern void synchronize_rcu_bh(void); |
90 | extern void synchronize_sched(void); | |
019129d5 | 91 | extern void synchronize_rcu_expedited(void); |
03b042bf PM |
92 | |
93 | static inline void synchronize_rcu_bh_expedited(void) | |
64db4cff | 94 | { |
03b042bf | 95 | synchronize_sched_expedited(); |
64db4cff PM |
96 | } |
97 | ||
64db4cff | 98 | extern void rcu_check_callbacks(int cpu, int user); |
64db4cff PM |
99 | |
100 | extern long rcu_batches_completed(void); | |
101 | extern long rcu_batches_completed_bh(void); | |
d6714c22 | 102 | extern long rcu_batches_completed_sched(void); |
bf66f18e PM |
103 | extern void rcu_force_quiescent_state(void); |
104 | extern void rcu_bh_force_quiescent_state(void); | |
105 | extern void rcu_sched_force_quiescent_state(void); | |
64db4cff PM |
106 | |
107 | #ifdef CONFIG_NO_HZ | |
108 | void rcu_enter_nohz(void); | |
109 | void rcu_exit_nohz(void); | |
110 | #else /* CONFIG_NO_HZ */ | |
111 | static inline void rcu_enter_nohz(void) | |
112 | { | |
113 | } | |
114 | static inline void rcu_exit_nohz(void) | |
115 | { | |
116 | } | |
117 | #endif /* CONFIG_NO_HZ */ | |
118 | ||
1eba8f84 | 119 | /* A context switch is a grace period for RCU-sched and RCU-bh. */ |
a6826048 PM |
120 | static inline int rcu_blocking_is_gp(void) |
121 | { | |
122 | return num_online_cpus() == 1; | |
123 | } | |
124 | ||
bbad9379 PM |
125 | extern void rcu_scheduler_starting(void); |
126 | extern int rcu_scheduler_active __read_mostly; | |
127 | ||
64db4cff | 128 | #endif /* __LINUX_RCUTREE_H */ |