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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 | ||
b2c0710c PM |
30 | static inline void rcu_init(void) |
31 | { | |
32 | } | |
9b1d82fa | 33 | |
2c42818e PM |
34 | static inline void rcu_barrier_bh(void) |
35 | { | |
36 | wait_rcu_gp(call_rcu_bh); | |
37 | } | |
38 | ||
39 | static inline void rcu_barrier_sched(void) | |
40 | { | |
41 | wait_rcu_gp(call_rcu_sched); | |
42 | } | |
43 | ||
a57eb940 | 44 | #ifdef CONFIG_TINY_RCU |
9b1d82fa | 45 | |
a57eb940 | 46 | static inline void synchronize_rcu_expedited(void) |
bf66f18e | 47 | { |
a57eb940 | 48 | synchronize_sched(); /* Only one CPU, so pretty fast anyway!!! */ |
bf66f18e PM |
49 | } |
50 | ||
a57eb940 | 51 | static inline void rcu_barrier(void) |
bf66f18e | 52 | { |
a57eb940 | 53 | rcu_barrier_sched(); /* Only one CPU, so only one list of callbacks! */ |
bf66f18e PM |
54 | } |
55 | ||
a57eb940 | 56 | #else /* #ifdef CONFIG_TINY_RCU */ |
da848c47 | 57 | |
a57eb940 | 58 | void synchronize_rcu_expedited(void); |
da848c47 | 59 | |
2c42818e PM |
60 | static inline void rcu_barrier(void) |
61 | { | |
62 | wait_rcu_gp(call_rcu); | |
63 | } | |
64 | ||
a57eb940 | 65 | #endif /* #else #ifdef CONFIG_TINY_RCU */ |
6ebb237b | 66 | |
a57eb940 | 67 | static inline void synchronize_rcu_bh(void) |
9b1d82fa PM |
68 | { |
69 | synchronize_sched(); | |
70 | } | |
71 | ||
72 | static inline void synchronize_rcu_bh_expedited(void) | |
73 | { | |
74 | synchronize_sched(); | |
75 | } | |
76 | ||
7b27d547 LJ |
77 | static inline void synchronize_sched_expedited(void) |
78 | { | |
79 | synchronize_sched(); | |
80 | } | |
81 | ||
486e2593 PM |
82 | static inline void kfree_call_rcu(struct rcu_head *head, |
83 | void (*func)(struct rcu_head *rcu)) | |
84 | { | |
85 | call_rcu(head, func); | |
86 | } | |
87 | ||
a57eb940 PM |
88 | #ifdef CONFIG_TINY_RCU |
89 | ||
cba6d0d6 PM |
90 | static inline void rcu_preempt_note_context_switch(void) |
91 | { | |
92 | } | |
93 | ||
aa9b1630 | 94 | static inline int rcu_needs_cpu(int cpu, unsigned long *delta_jiffies) |
a57eb940 | 95 | { |
aa9b1630 | 96 | *delta_jiffies = ULONG_MAX; |
a57eb940 PM |
97 | return 0; |
98 | } | |
99 | ||
a57eb940 PM |
100 | #else /* #ifdef CONFIG_TINY_RCU */ |
101 | ||
cba6d0d6 | 102 | void rcu_preempt_note_context_switch(void); |
a57eb940 PM |
103 | int rcu_preempt_needs_cpu(void); |
104 | ||
aa9b1630 | 105 | static inline int rcu_needs_cpu(int cpu, unsigned long *delta_jiffies) |
a57eb940 | 106 | { |
aa9b1630 | 107 | *delta_jiffies = ULONG_MAX; |
a57eb940 PM |
108 | return rcu_preempt_needs_cpu(); |
109 | } | |
110 | ||
a57eb940 PM |
111 | #endif /* #else #ifdef CONFIG_TINY_RCU */ |
112 | ||
113 | static inline void rcu_note_context_switch(int cpu) | |
114 | { | |
115 | rcu_sched_qs(cpu); | |
cba6d0d6 | 116 | rcu_preempt_note_context_switch(); |
a57eb940 PM |
117 | } |
118 | ||
29ce8310 GN |
119 | /* |
120 | * Take advantage of the fact that there is only one CPU, which | |
121 | * allows us to ignore virtualization-based context switches. | |
122 | */ | |
123 | static inline void rcu_virt_note_context_switch(int cpu) | |
124 | { | |
125 | } | |
126 | ||
a57eb940 PM |
127 | /* |
128 | * Return the number of grace periods. | |
129 | */ | |
130 | static inline long rcu_batches_completed(void) | |
131 | { | |
132 | return 0; | |
133 | } | |
134 | ||
135 | /* | |
136 | * Return the number of bottom-half grace periods. | |
137 | */ | |
138 | static inline long rcu_batches_completed_bh(void) | |
139 | { | |
140 | return 0; | |
141 | } | |
142 | ||
143 | static inline void rcu_force_quiescent_state(void) | |
144 | { | |
145 | } | |
146 | ||
147 | static inline void rcu_bh_force_quiescent_state(void) | |
148 | { | |
149 | } | |
150 | ||
151 | static inline void rcu_sched_force_quiescent_state(void) | |
152 | { | |
153 | } | |
154 | ||
53d84e00 PM |
155 | static inline void rcu_cpu_stall_reset(void) |
156 | { | |
157 | } | |
158 | ||
bbad9379 | 159 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
bbad9379 PM |
160 | extern int rcu_scheduler_active __read_mostly; |
161 | extern void rcu_scheduler_starting(void); | |
bbad9379 | 162 | #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */ |
bbad9379 PM |
163 | static inline void rcu_scheduler_starting(void) |
164 | { | |
165 | } | |
bbad9379 PM |
166 | #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */ |
167 | ||
9b1d82fa | 168 | #endif /* __LINUX_RCUTINY_H */ |