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64db4cff PM |
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 - | |
a71fca58 | 27 | * Documentation/RCU |
64db4cff PM |
28 | */ |
29 | ||
30 | #ifndef __LINUX_RCUTREE_H | |
31 | #define __LINUX_RCUTREE_H | |
32 | ||
b2c0710c | 33 | extern void rcu_init(void); |
25502a6c | 34 | extern void rcu_note_context_switch(int cpu); |
aa9b1630 | 35 | extern int rcu_needs_cpu(int cpu, unsigned long *delta_jiffies); |
53d84e00 | 36 | extern void rcu_cpu_stall_reset(void); |
64db4cff | 37 | |
29ce8310 GN |
38 | /* |
39 | * Note a virtualization-based context switch. This is simply a | |
40 | * wrapper around rcu_note_context_switch(), which allows TINY_RCU | |
41 | * to save a few bytes. | |
42 | */ | |
43 | static inline void rcu_virt_note_context_switch(int cpu) | |
44 | { | |
45 | rcu_note_context_switch(cpu); | |
46 | } | |
47 | ||
da848c47 | 48 | extern void synchronize_rcu_bh(void); |
7b27d547 | 49 | extern void synchronize_sched_expedited(void); |
019129d5 | 50 | extern void synchronize_rcu_expedited(void); |
03b042bf | 51 | |
486e2593 PM |
52 | void kfree_call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu)); |
53 | ||
236fefaf PM |
54 | /** |
55 | * synchronize_rcu_bh_expedited - Brute-force RCU-bh grace period | |
56 | * | |
57 | * Wait for an RCU-bh grace period to elapse, but use a "big hammer" | |
58 | * approach to force the grace period to end quickly. This consumes | |
59 | * significant time on all CPUs and is unfriendly to real-time workloads, | |
60 | * so is thus not recommended for any sort of common-case code. In fact, | |
61 | * if you are using synchronize_rcu_bh_expedited() in a loop, please | |
62 | * restructure your code to batch your updates, and then use a single | |
63 | * synchronize_rcu_bh() instead. | |
64 | * | |
65 | * Note that it is illegal to call this function while holding any lock | |
66 | * that is acquired by a CPU-hotplug notifier. And yes, it is also illegal | |
67 | * to call this function from a CPU-hotplug notifier. Failing to observe | |
68 | * these restriction will result in deadlock. | |
69 | */ | |
03b042bf | 70 | static inline void synchronize_rcu_bh_expedited(void) |
64db4cff | 71 | { |
03b042bf | 72 | synchronize_sched_expedited(); |
64db4cff PM |
73 | } |
74 | ||
a57eb940 | 75 | extern void rcu_barrier(void); |
2c42818e PM |
76 | extern void rcu_barrier_bh(void); |
77 | extern void rcu_barrier_sched(void); | |
a57eb940 | 78 | |
4a298656 PM |
79 | extern unsigned long rcutorture_testseq; |
80 | extern unsigned long rcutorture_vernum; | |
64db4cff PM |
81 | extern long rcu_batches_completed(void); |
82 | extern long rcu_batches_completed_bh(void); | |
d6714c22 | 83 | extern long rcu_batches_completed_sched(void); |
4a298656 | 84 | |
bf66f18e PM |
85 | extern void rcu_force_quiescent_state(void); |
86 | extern void rcu_bh_force_quiescent_state(void); | |
87 | extern void rcu_sched_force_quiescent_state(void); | |
64db4cff | 88 | |
bbad9379 PM |
89 | extern void rcu_scheduler_starting(void); |
90 | extern int rcu_scheduler_active __read_mostly; | |
91 | ||
64db4cff | 92 | #endif /* __LINUX_RCUTREE_H */ |