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, you can access it online at
16 * http://www.gnu.org/licenses/gpl-2.0.html.
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>
31 static inline int rcu_dynticks_snap(struct rcu_dynticks *rdtp)
36 static inline bool rcu_eqs_special_set(int cpu)
38 return false; /* Never flag non-existent other CPUs! */
41 static inline unsigned long get_state_synchronize_rcu(void)
46 static inline void cond_synchronize_rcu(unsigned long oldstate)
51 static inline unsigned long get_state_synchronize_sched(void)
56 static inline void cond_synchronize_sched(unsigned long oldstate)
61 extern void rcu_barrier_bh(void);
62 extern void rcu_barrier_sched(void);
64 static inline void synchronize_rcu_expedited(void)
66 synchronize_sched(); /* Only one CPU, so pretty fast anyway!!! */
69 static inline void rcu_barrier(void)
71 rcu_barrier_sched(); /* Only one CPU, so only one list of callbacks! */
74 static inline void synchronize_rcu_bh(void)
79 static inline void synchronize_rcu_bh_expedited(void)
84 static inline void synchronize_sched_expedited(void)
89 static inline void kfree_call_rcu(struct rcu_head *head,
95 #define rcu_note_context_switch(preempt) \
98 rcu_note_voluntary_context_switch_lite(current); \
102 * Take advantage of the fact that there is only one CPU, which
103 * allows us to ignore virtualization-based context switches.
105 static inline void rcu_virt_note_context_switch(int cpu)
109 static inline void rcu_cpu_stall_reset(void)
113 static inline void rcu_idle_enter(void)
117 static inline void rcu_idle_exit(void)
121 static inline void rcu_irq_enter(void)
125 static inline bool rcu_irq_enter_disabled(void)
130 static inline void rcu_irq_exit_irqson(void)
134 static inline void rcu_irq_enter_irqson(void)
138 static inline void rcu_irq_exit(void)
142 static inline void exit_rcu(void)
146 #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU)
147 extern int rcu_scheduler_active __read_mostly;
148 void rcu_scheduler_starting(void);
149 #else /* #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU) */
150 static inline void rcu_scheduler_starting(void)
153 #endif /* #else #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_SRCU) */
155 static inline bool rcu_is_watching(void)
160 static inline void rcu_request_urgent_qs_task(struct task_struct *t)
164 static inline void rcu_all_qs(void)
166 barrier(); /* Avoid RCU read-side critical sections leaking across. */
169 /* RCUtree hotplug events */
170 #define rcutree_prepare_cpu NULL
171 #define rcutree_online_cpu NULL
172 #define rcutree_offline_cpu NULL
173 #define rcutree_dead_cpu NULL
174 #define rcutree_dying_cpu NULL
176 #endif /* __LINUX_RCUTINY_H */