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8021q: fix a potential memory leak
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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
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15 * along with this program; if not, you can access it online at
16 * http://www.gnu.org/licenses/gpl-2.0.html.
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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
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28 */
29
30#ifndef __LINUX_RCUTREE_H
31#define __LINUX_RCUTREE_H
32
584dc4ce 33void rcu_note_context_switch(int cpu);
ffa83fb5 34#ifndef CONFIG_RCU_NOCB_CPU_ALL
584dc4ce 35int rcu_needs_cpu(int cpu, unsigned long *delta_jiffies);
ffa83fb5 36#endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */
584dc4ce 37void rcu_cpu_stall_reset(void);
64db4cff 38
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39/*
40 * Note a virtualization-based context switch. This is simply a
41 * wrapper around rcu_note_context_switch(), which allows TINY_RCU
42 * to save a few bytes.
43 */
44static inline void rcu_virt_note_context_switch(int cpu)
45{
46 rcu_note_context_switch(cpu);
47}
48
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49void synchronize_rcu_bh(void);
50void synchronize_sched_expedited(void);
51void synchronize_rcu_expedited(void);
03b042bf 52
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53void kfree_call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu));
54
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55/**
56 * synchronize_rcu_bh_expedited - Brute-force RCU-bh grace period
57 *
58 * Wait for an RCU-bh grace period to elapse, but use a "big hammer"
59 * approach to force the grace period to end quickly. This consumes
60 * significant time on all CPUs and is unfriendly to real-time workloads,
61 * so is thus not recommended for any sort of common-case code. In fact,
62 * if you are using synchronize_rcu_bh_expedited() in a loop, please
63 * restructure your code to batch your updates, and then use a single
64 * synchronize_rcu_bh() instead.
65 *
66 * Note that it is illegal to call this function while holding any lock
67 * that is acquired by a CPU-hotplug notifier. And yes, it is also illegal
68 * to call this function from a CPU-hotplug notifier. Failing to observe
69 * these restriction will result in deadlock.
70 */
03b042bf 71static inline void synchronize_rcu_bh_expedited(void)
64db4cff 72{
03b042bf 73 synchronize_sched_expedited();
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74}
75
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76void rcu_barrier(void);
77void rcu_barrier_bh(void);
78void rcu_barrier_sched(void);
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79unsigned long get_state_synchronize_rcu(void);
80void cond_synchronize_rcu(unsigned long oldstate);
a57eb940 81
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82extern unsigned long rcutorture_testseq;
83extern unsigned long rcutorture_vernum;
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84long rcu_batches_completed(void);
85long rcu_batches_completed_bh(void);
86long rcu_batches_completed_sched(void);
afea227f 87void show_rcu_gp_kthreads(void);
4a298656 88
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89void rcu_force_quiescent_state(void);
90void rcu_bh_force_quiescent_state(void);
91void rcu_sched_force_quiescent_state(void);
64db4cff 92
584dc4ce 93void exit_rcu(void);
2439b696 94
584dc4ce 95void rcu_scheduler_starting(void);
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96extern int rcu_scheduler_active __read_mostly;
97
584dc4ce 98bool rcu_is_watching(void);
cc6783f7 99
64db4cff 100#endif /* __LINUX_RCUTREE_H */