1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Read-Copy Update mechanism for mutual exclusion (tree-based version)
5 * Copyright IBM Corporation, 2008
7 * Author: Dipankar Sarma <dipankar@in.ibm.com>
8 * Paul E. McKenney <paulmck@linux.ibm.com> Hierarchical algorithm
10 * Based on the original work by Paul McKenney <paulmck@linux.ibm.com>
11 * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
13 * For detailed explanation of Read-Copy Update mechanism see -
17 #ifndef __LINUX_RCUTREE_H
18 #define __LINUX_RCUTREE_H
20 void rcu_softirq_qs(void);
21 void rcu_note_context_switch(bool preempt);
22 int rcu_needs_cpu(u64 basem, u64 *nextevt);
23 void rcu_cpu_stall_reset(void);
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.
30 static inline void rcu_virt_note_context_switch(int cpu)
32 rcu_note_context_switch(false);
35 void synchronize_rcu_expedited(void);
36 void kfree_call_rcu(struct rcu_head *head, rcu_callback_t func);
38 void rcu_barrier(void);
39 bool rcu_eqs_special_set(int cpu);
40 void rcu_momentary_dyntick_idle(void);
41 void kfree_rcu_scheduler_running(void);
42 unsigned long get_state_synchronize_rcu(void);
43 void cond_synchronize_rcu(unsigned long oldstate);
45 void rcu_idle_enter(void);
46 void rcu_idle_exit(void);
47 void rcu_irq_enter(void);
48 void rcu_irq_exit(void);
49 void rcu_irq_enter_irqson(void);
50 void rcu_irq_exit_irqson(void);
54 void rcu_scheduler_starting(void);
55 extern int rcu_scheduler_active __read_mostly;
56 void rcu_end_inkernel_boot(void);
57 bool rcu_is_watching(void);
58 #ifndef CONFIG_PREEMPTION
59 void rcu_all_qs(void);
62 /* RCUtree hotplug events */
63 int rcutree_prepare_cpu(unsigned int cpu);
64 int rcutree_online_cpu(unsigned int cpu);
65 int rcutree_offline_cpu(unsigned int cpu);
66 int rcutree_dead_cpu(unsigned int cpu);
67 int rcutree_dying_cpu(unsigned int cpu);
68 void rcu_cpu_starting(unsigned int cpu);
70 #endif /* __LINUX_RCUTREE_H */