Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Read-Copy Update mechanism for mutual exclusion (tree-based version)
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: Dipankar Sarma <dipankar@in.ibm.com>
21 * Paul E. McKenney <paulmck@linux.vnet.ibm.com> Hierarchical algorithm
22 *
23 * Based on the original work by Paul McKenney <paulmck@us.ibm.com>
24 * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
25 *
26 * For detailed explanation of Read-Copy Update mechanism see -
27 * Documentation/RCU
28 */
29
30#ifndef __LINUX_RCUTREE_H
31#define __LINUX_RCUTREE_H
32
33extern void rcu_note_context_switch(int cpu);
34extern int rcu_needs_cpu(int cpu);
35extern void rcu_cpu_stall_reset(void);
36
37#ifdef CONFIG_TREE_PREEMPT_RCU
38
39extern void exit_rcu(void);
40
41#else /* #ifdef CONFIG_TREE_PREEMPT_RCU */
42
43static inline void exit_rcu(void)
44{
45}
46
47#endif /* #else #ifdef CONFIG_TREE_PREEMPT_RCU */
48
49extern void synchronize_rcu_bh(void);
50extern void synchronize_rcu_expedited(void);
51
52static inline void synchronize_rcu_bh_expedited(void)
53{
54 synchronize_sched_expedited();
55}
56
57extern void rcu_barrier(void);
58
59extern long rcu_batches_completed(void);
60extern long rcu_batches_completed_bh(void);
61extern long rcu_batches_completed_sched(void);
62extern void rcu_force_quiescent_state(void);
63extern void rcu_bh_force_quiescent_state(void);
64extern void rcu_sched_force_quiescent_state(void);
65
66/* A context switch is a grace period for RCU-sched and RCU-bh. */
67static inline int rcu_blocking_is_gp(void)
68{
69 return num_online_cpus() == 1;
70}
71
72extern void rcu_scheduler_starting(void);
73extern int rcu_scheduler_active __read_mostly;
74
75#endif /* __LINUX_RCUTREE_H */