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1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * Read-Copy Update mechanism for mutual exclusion (tree-based version)
4 *
5 * Copyright IBM Corporation, 2008
6 *
7 * Author: Dipankar Sarma <dipankar@in.ibm.com>
8 * Paul E. McKenney <paulmck@linux.ibm.com> Hierarchical algorithm
9 *
10 * Based on the original work by Paul McKenney <paulmck@linux.ibm.com>
11 * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
12 *
13 * For detailed explanation of Read-Copy Update mechanism see -
14 * Documentation/RCU
15 */
16
17#ifndef __LINUX_RCUTREE_H
18#define __LINUX_RCUTREE_H
19
20void rcu_softirq_qs(void);
21void rcu_note_context_switch(bool preempt);
22int rcu_needs_cpu(void);
23void rcu_cpu_stall_reset(void);
24
25/*
26 * Note a virtualization-based context switch. This is simply a
27 * wrapper around rcu_note_context_switch(), which allows TINY_RCU
28 * to save a few bytes. The caller must have disabled interrupts.
29 */
30static inline void rcu_virt_note_context_switch(int cpu)
31{
32 rcu_note_context_switch(false);
33}
34
35void synchronize_rcu_expedited(void);
36void kvfree_call_rcu(struct rcu_head *head, rcu_callback_t func);
37
38void rcu_barrier(void);
39bool rcu_eqs_special_set(int cpu);
40void rcu_momentary_dyntick_idle(void);
41void kfree_rcu_scheduler_running(void);
42bool rcu_gp_might_be_stalled(void);
43unsigned long start_poll_synchronize_rcu_expedited(void);
44void cond_synchronize_rcu_expedited(unsigned long oldstate);
45unsigned long get_state_synchronize_rcu(void);
46unsigned long start_poll_synchronize_rcu(void);
47bool poll_state_synchronize_rcu(unsigned long oldstate);
48void cond_synchronize_rcu(unsigned long oldstate);
49
50bool rcu_is_idle_cpu(int cpu);
51
52#ifdef CONFIG_PROVE_RCU
53void rcu_irq_exit_check_preempt(void);
54#else
55static inline void rcu_irq_exit_check_preempt(void) { }
56#endif
57
58struct task_struct;
59void rcu_preempt_deferred_qs(struct task_struct *t);
60
61void exit_rcu(void);
62
63void rcu_scheduler_starting(void);
64extern int rcu_scheduler_active;
65void rcu_end_inkernel_boot(void);
66bool rcu_inkernel_boot_has_ended(void);
67bool rcu_is_watching(void);
68#ifndef CONFIG_PREEMPTION
69void rcu_all_qs(void);
70#endif
71
72/* RCUtree hotplug events */
73int rcutree_prepare_cpu(unsigned int cpu);
74int rcutree_online_cpu(unsigned int cpu);
75int rcutree_offline_cpu(unsigned int cpu);
76int rcutree_dead_cpu(unsigned int cpu);
77int rcutree_dying_cpu(unsigned int cpu);
78void rcu_cpu_starting(unsigned int cpu);
79
80#endif /* __LINUX_RCUTREE_H */