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 -
25 #ifndef __LINUX_TINY_H
26 #define __LINUX_TINY_H
28 #include <linux/cache.h>
30 static inline void rcu_init(void)
34 static inline void rcu_barrier_bh(void)
36 wait_rcu_gp(call_rcu_bh);
39 static inline void rcu_barrier_sched(void)
41 wait_rcu_gp(call_rcu_sched);
44 #ifdef CONFIG_TINY_RCU
46 static inline void synchronize_rcu_expedited(void)
48 synchronize_sched(); /* Only one CPU, so pretty fast anyway!!! */
51 static inline void rcu_barrier(void)
53 rcu_barrier_sched(); /* Only one CPU, so only one list of callbacks! */
56 #else /* #ifdef CONFIG_TINY_RCU */
58 void synchronize_rcu_expedited(void);
60 static inline void rcu_barrier(void)
62 wait_rcu_gp(call_rcu);
65 #endif /* #else #ifdef CONFIG_TINY_RCU */
67 static inline void synchronize_rcu_bh(void)
72 static inline void synchronize_rcu_bh_expedited(void)
77 static inline void synchronize_sched_expedited(void)
82 static inline void kfree_call_rcu(struct rcu_head *head,
83 void (*func)(struct rcu_head *rcu))
88 #ifdef CONFIG_TINY_RCU
90 static inline int rcu_needs_cpu(int cpu, unsigned long *delta_jiffies)
92 *delta_jiffies = ULONG_MAX;
96 #else /* #ifdef CONFIG_TINY_RCU */
98 int rcu_preempt_needs_cpu(void);
100 static inline int rcu_needs_cpu(int cpu, unsigned long *delta_jiffies)
102 *delta_jiffies = ULONG_MAX;
103 return rcu_preempt_needs_cpu();
106 #endif /* #else #ifdef CONFIG_TINY_RCU */
108 static inline void rcu_note_context_switch(int cpu)
114 * Take advantage of the fact that there is only one CPU, which
115 * allows us to ignore virtualization-based context switches.
117 static inline void rcu_virt_note_context_switch(int cpu)
122 * Return the number of grace periods.
124 static inline long rcu_batches_completed(void)
130 * Return the number of bottom-half grace periods.
132 static inline long rcu_batches_completed_bh(void)
137 static inline void rcu_force_quiescent_state(void)
141 static inline void rcu_bh_force_quiescent_state(void)
145 static inline void rcu_sched_force_quiescent_state(void)
149 static inline void rcu_cpu_stall_reset(void)
153 #ifdef CONFIG_DEBUG_LOCK_ALLOC
154 extern int rcu_scheduler_active __read_mostly;
155 extern void rcu_scheduler_starting(void);
156 #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
157 static inline void rcu_scheduler_starting(void)
160 #endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
162 #endif /* __LINUX_RCUTINY_H */