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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 - | |
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 | ||
9b1d82fa | 30 | #define rcu_init_sched() do { } while (0) |
9b1d82fa | 31 | |
a57eb940 | 32 | #ifdef CONFIG_TINY_RCU |
9b1d82fa | 33 | |
a57eb940 | 34 | static inline void synchronize_rcu_expedited(void) |
bf66f18e | 35 | { |
a57eb940 | 36 | synchronize_sched(); /* Only one CPU, so pretty fast anyway!!! */ |
bf66f18e PM |
37 | } |
38 | ||
a57eb940 | 39 | static inline void rcu_barrier(void) |
bf66f18e | 40 | { |
a57eb940 | 41 | rcu_barrier_sched(); /* Only one CPU, so only one list of callbacks! */ |
bf66f18e PM |
42 | } |
43 | ||
a57eb940 | 44 | #else /* #ifdef CONFIG_TINY_RCU */ |
da848c47 | 45 | |
a57eb940 PM |
46 | void rcu_barrier(void); |
47 | void synchronize_rcu_expedited(void); | |
da848c47 | 48 | |
a57eb940 | 49 | #endif /* #else #ifdef CONFIG_TINY_RCU */ |
6ebb237b | 50 | |
a57eb940 | 51 | static inline void synchronize_rcu_bh(void) |
9b1d82fa PM |
52 | { |
53 | synchronize_sched(); | |
54 | } | |
55 | ||
56 | static inline void synchronize_rcu_bh_expedited(void) | |
57 | { | |
58 | synchronize_sched(); | |
59 | } | |
60 | ||
a57eb940 PM |
61 | #ifdef CONFIG_TINY_RCU |
62 | ||
63 | static inline void rcu_preempt_note_context_switch(void) | |
64 | { | |
65 | } | |
66 | ||
9b1d82fa PM |
67 | static inline void exit_rcu(void) |
68 | { | |
69 | } | |
70 | ||
a57eb940 PM |
71 | static inline int rcu_needs_cpu(int cpu) |
72 | { | |
73 | return 0; | |
74 | } | |
75 | ||
a57eb940 PM |
76 | #else /* #ifdef CONFIG_TINY_RCU */ |
77 | ||
78 | void rcu_preempt_note_context_switch(void); | |
79 | extern void exit_rcu(void); | |
80 | int rcu_preempt_needs_cpu(void); | |
81 | ||
82 | static inline int rcu_needs_cpu(int cpu) | |
83 | { | |
84 | return rcu_preempt_needs_cpu(); | |
85 | } | |
86 | ||
a57eb940 PM |
87 | #endif /* #else #ifdef CONFIG_TINY_RCU */ |
88 | ||
89 | static inline void rcu_note_context_switch(int cpu) | |
90 | { | |
91 | rcu_sched_qs(cpu); | |
92 | rcu_preempt_note_context_switch(); | |
93 | } | |
94 | ||
a57eb940 PM |
95 | /* |
96 | * Return the number of grace periods. | |
97 | */ | |
98 | static inline long rcu_batches_completed(void) | |
99 | { | |
100 | return 0; | |
101 | } | |
102 | ||
103 | /* | |
104 | * Return the number of bottom-half grace periods. | |
105 | */ | |
106 | static inline long rcu_batches_completed_bh(void) | |
107 | { | |
108 | return 0; | |
109 | } | |
110 | ||
111 | static inline void rcu_force_quiescent_state(void) | |
112 | { | |
113 | } | |
114 | ||
115 | static inline void rcu_bh_force_quiescent_state(void) | |
116 | { | |
117 | } | |
118 | ||
119 | static inline void rcu_sched_force_quiescent_state(void) | |
120 | { | |
121 | } | |
122 | ||
53d84e00 PM |
123 | static inline void rcu_cpu_stall_reset(void) |
124 | { | |
125 | } | |
126 | ||
bbad9379 PM |
127 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
128 | ||
129 | extern int rcu_scheduler_active __read_mostly; | |
130 | extern void rcu_scheduler_starting(void); | |
131 | ||
132 | #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */ | |
133 | ||
134 | static inline void rcu_scheduler_starting(void) | |
135 | { | |
136 | } | |
137 | ||
138 | #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */ | |
139 | ||
9b1d82fa | 140 | #endif /* __LINUX_RCUTINY_H */ |