Merge branch 'master' of /pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / linux / rcutiny.h
blob30ebd7c8d874b4dfeb9c9c9e5c5e857fbb43ab62
1 /*
2 * Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition.
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.
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.
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.
18 * Copyright IBM Corporation, 2008
20 * Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
22 * For detailed explanation of Read-Copy Update mechanism see -
23 * Documentation/RCU
25 #ifndef __LINUX_TINY_H
26 #define __LINUX_TINY_H
28 #include <linux/cache.h>
30 static inline void rcu_init(void)
34 #ifdef CONFIG_TINY_RCU
36 static inline void synchronize_rcu_expedited(void)
38 synchronize_sched(); /* Only one CPU, so pretty fast anyway!!! */
41 static inline void rcu_barrier(void)
43 rcu_barrier_sched(); /* Only one CPU, so only one list of callbacks! */
46 #else /* #ifdef CONFIG_TINY_RCU */
48 void rcu_barrier(void);
49 void synchronize_rcu_expedited(void);
51 #endif /* #else #ifdef CONFIG_TINY_RCU */
53 static inline void synchronize_rcu_bh(void)
55 synchronize_sched();
58 static inline void synchronize_rcu_bh_expedited(void)
60 synchronize_sched();
63 static inline void synchronize_sched_expedited(void)
65 synchronize_sched();
68 #ifdef CONFIG_TINY_RCU
70 static inline void rcu_preempt_note_context_switch(void)
74 static inline void exit_rcu(void)
78 static inline int rcu_needs_cpu(int cpu)
80 return 0;
83 #else /* #ifdef CONFIG_TINY_RCU */
85 void rcu_preempt_note_context_switch(void);
86 extern void exit_rcu(void);
87 int rcu_preempt_needs_cpu(void);
89 static inline int rcu_needs_cpu(int cpu)
91 return rcu_preempt_needs_cpu();
94 #endif /* #else #ifdef CONFIG_TINY_RCU */
96 static inline void rcu_note_context_switch(int cpu)
98 rcu_sched_qs(cpu);
99 rcu_preempt_note_context_switch();
103 * Return the number of grace periods.
105 static inline long rcu_batches_completed(void)
107 return 0;
111 * Return the number of bottom-half grace periods.
113 static inline long rcu_batches_completed_bh(void)
115 return 0;
118 static inline void rcu_force_quiescent_state(void)
122 static inline void rcu_bh_force_quiescent_state(void)
126 static inline void rcu_sched_force_quiescent_state(void)
130 static inline void rcu_cpu_stall_reset(void)
134 #ifdef CONFIG_DEBUG_LOCK_ALLOC
135 extern int rcu_scheduler_active __read_mostly;
136 extern void rcu_scheduler_starting(void);
137 #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
138 static inline void rcu_scheduler_starting(void)
141 #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
143 #endif /* __LINUX_RCUTINY_H */