USB: gadget: Fix EEM driver comments and VID/PID
[linux-2.6/mini2440.git] / include / linux / rcutree.h
blob46e9ab3ee6e1cc0dc17b101836f3c98f8b6cf3bf
1 /*
2 * Read-Copy Update mechanism for mutual exclusion (tree-based version)
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: Dipankar Sarma <dipankar@in.ibm.com>
21 * Paul E. McKenney <paulmck@linux.vnet.ibm.com> Hierarchical algorithm
23 * Based on the original work by Paul McKenney <paulmck@us.ibm.com>
24 * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
26 * For detailed explanation of Read-Copy Update mechanism see -
27 * Documentation/RCU
30 #ifndef __LINUX_RCUTREE_H
31 #define __LINUX_RCUTREE_H
33 struct notifier_block;
35 extern void rcu_sched_qs(int cpu);
36 extern void rcu_bh_qs(int cpu);
37 extern int rcu_cpu_notify(struct notifier_block *self,
38 unsigned long action, void *hcpu);
39 extern int rcu_needs_cpu(int cpu);
40 extern int rcu_expedited_torture_stats(char *page);
42 #ifdef CONFIG_TREE_PREEMPT_RCU
44 extern void __rcu_read_lock(void);
45 extern void __rcu_read_unlock(void);
46 extern void exit_rcu(void);
48 #else /* #ifdef CONFIG_TREE_PREEMPT_RCU */
50 static inline void __rcu_read_lock(void)
52 preempt_disable();
55 static inline void __rcu_read_unlock(void)
57 preempt_enable();
60 #define __synchronize_sched() synchronize_rcu()
62 static inline void exit_rcu(void)
66 #endif /* #else #ifdef CONFIG_TREE_PREEMPT_RCU */
68 static inline void __rcu_read_lock_bh(void)
70 local_bh_disable();
72 static inline void __rcu_read_unlock_bh(void)
74 local_bh_enable();
77 extern void call_rcu_sched(struct rcu_head *head,
78 void (*func)(struct rcu_head *rcu));
80 static inline void synchronize_rcu_expedited(void)
82 synchronize_sched_expedited();
85 static inline void synchronize_rcu_bh_expedited(void)
87 synchronize_sched_expedited();
90 extern void __rcu_init(void);
91 extern void rcu_check_callbacks(int cpu, int user);
93 extern long rcu_batches_completed(void);
94 extern long rcu_batches_completed_bh(void);
95 extern long rcu_batches_completed_sched(void);
97 #ifdef CONFIG_NO_HZ
98 void rcu_enter_nohz(void);
99 void rcu_exit_nohz(void);
100 #else /* CONFIG_NO_HZ */
101 static inline void rcu_enter_nohz(void)
104 static inline void rcu_exit_nohz(void)
107 #endif /* CONFIG_NO_HZ */
109 /* A context switch is a grace period for RCU-sched and RCU-bh. */
110 static inline int rcu_blocking_is_gp(void)
112 return num_online_cpus() == 1;
115 #endif /* __LINUX_RCUTREE_H */