aboutsummaryrefslogtreecommitdiff
path: root/include/linux/rcutiny.h
blob: c4ba9a78721e1f4130526255050a1ed7f888ca4b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
/*
 * Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Copyright IBM Corporation, 2008
 *
 * Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
 *
 * For detailed explanation of Read-Copy Update mechanism see -
 *		Documentation/RCU
 */
#ifndef __LINUX_TINY_H
#define __LINUX_TINY_H

#include <linux/cache.h>

void rcu_sched_qs(int cpu);
void rcu_bh_qs(int cpu);

#define __rcu_read_lock()	preempt_disable()
#define __rcu_read_unlock()	preempt_enable()
#define __rcu_read_lock_bh()	local_bh_disable()
#define __rcu_read_unlock_bh()	local_bh_enable()
#define call_rcu_sched		call_rcu

#define rcu_init_sched()	do { } while (0)
extern void rcu_check_callbacks(int cpu, int user);

static inline int rcu_needs_cpu(int cpu)
{
	return 0;
}

/*
 * Return the number of grace periods.
 */
static inline long rcu_batches_completed(void)
{
	return 0;
}

/*
 * Return the number of bottom-half grace periods.
 */
static inline long rcu_batches_completed_bh(void)
{
	return 0;
}

extern int rcu_expedited_torture_stats(char *page);

#define synchronize_rcu synchronize_sched

static inline void synchronize_rcu_expedited(void)
{
	synchronize_sched();
}

static inline void synchronize_rcu_bh_expedited(void)
{
	synchronize_sched();
}

struct notifier_block;

#ifdef CONFIG_NO_HZ

extern void rcu_enter_nohz(void);
extern void rcu_exit_nohz(void);

#else /* #ifdef CONFIG_NO_HZ */

static inline void rcu_enter_nohz(void)
{
}

static inline void rcu_exit_nohz(void)
{
}

#endif /* #else #ifdef CONFIG_NO_HZ */

static inline void rcu_scheduler_starting(void)
{
}

static inline void exit_rcu(void)
{
}

#endif /* __LINUX_RCUTINY_H */