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, you can access it online at
16 * http://www.gnu.org/licenses/gpl-2.0.html.
18 * Copyright IBM Corporation, 2008
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 void rcu_softirq_qs(void);
34 void rcu_note_context_switch(bool preempt);
35 int rcu_needs_cpu(u64 basem, u64 *nextevt);
36 void rcu_cpu_stall_reset(void);
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. The caller must have disabled interrupts.
43 static inline void rcu_virt_note_context_switch(int cpu)
45 rcu_note_context_switch(false);
48 void synchronize_rcu_expedited(void);
49 void kfree_call_rcu(struct rcu_head *head, rcu_callback_t func);
51 void rcu_barrier(void);
52 bool rcu_eqs_special_set(int cpu);
53 unsigned long get_state_synchronize_rcu(void);
54 void cond_synchronize_rcu(unsigned long oldstate);
56 void rcu_idle_enter(void);
57 void rcu_idle_exit(void);
58 void rcu_irq_enter(void);
59 void rcu_irq_exit(void);
60 void rcu_irq_enter_irqson(void);
61 void rcu_irq_exit_irqson(void);
65 void rcu_scheduler_starting(void);
66 extern int rcu_scheduler_active __read_mostly;
67 void rcu_end_inkernel_boot(void);
68 bool rcu_is_watching(void);
69 #ifndef CONFIG_PREEMPT
70 void rcu_all_qs(void);
73 /* RCUtree hotplug events */
74 int rcutree_prepare_cpu(unsigned int cpu);
75 int rcutree_online_cpu(unsigned int cpu);
76 int rcutree_offline_cpu(unsigned int cpu);
77 int rcutree_dead_cpu(unsigned int cpu);
78 int rcutree_dying_cpu(unsigned int cpu);
79 void rcu_cpu_starting(unsigned int cpu);
81 #endif /* __LINUX_RCUTREE_H */