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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - include/linux/rcutree.h
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 -
30 #ifndef __LINUX_RCUTREE_H
31 #define __LINUX_RCUTREE_H
33 extern void rcu_sched_qs(int cpu
);
34 extern void rcu_bh_qs(int cpu
);
36 extern int rcu_needs_cpu(int cpu
);
38 static inline void __rcu_read_lock(void)
42 static inline void __rcu_read_unlock(void)
46 static inline void __rcu_read_lock_bh(void)
50 static inline void __rcu_read_unlock_bh(void)
55 #define __synchronize_sched() synchronize_rcu()
57 extern void call_rcu_sched(struct rcu_head
*head
,
58 void (*func
)(struct rcu_head
*rcu
));
60 static inline void synchronize_rcu_expedited(void)
62 synchronize_sched_expedited();
65 static inline void synchronize_rcu_bh_expedited(void)
67 synchronize_sched_expedited();
70 extern void __rcu_init(void);
71 extern void rcu_check_callbacks(int cpu
, int user
);
72 extern void rcu_restart_cpu(int cpu
);
74 extern long rcu_batches_completed(void);
75 extern long rcu_batches_completed_bh(void);
76 extern long rcu_batches_completed_sched(void);
78 static inline void rcu_init_sched(void)
83 void rcu_enter_nohz(void);
84 void rcu_exit_nohz(void);
85 #else /* CONFIG_NO_HZ */
86 static inline void rcu_enter_nohz(void)
89 static inline void rcu_exit_nohz(void)
92 #endif /* CONFIG_NO_HZ */
94 /* A context switch is a grace period for rcutree. */
95 static inline int rcu_blocking_is_gp(void)
97 return num_online_cpus() == 1;
100 #endif /* __LINUX_RCUTREE_H */