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 kvfree_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 bool rcu_gp_might_be_stalled(void);
43 unsigned long get_state_synchronize_rcu(void);
44 unsigned long start_poll_synchronize_rcu(void);
45 bool poll_state_synchronize_rcu(unsigned long oldstate
);
46 void cond_synchronize_rcu(unsigned long oldstate
);
48 void rcu_idle_enter(void);
49 void rcu_idle_exit(void);
50 void rcu_irq_enter(void);
51 void rcu_irq_exit(void);
52 void rcu_irq_exit_preempt(void);
53 void rcu_irq_enter_irqson(void);
54 void rcu_irq_exit_irqson(void);
55 bool rcu_is_idle_cpu(int cpu
);
57 #ifdef CONFIG_PROVE_RCU
58 void rcu_irq_exit_check_preempt(void);
60 static inline void rcu_irq_exit_check_preempt(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_inkernel_boot_has_ended(void);
69 bool rcu_is_watching(void);
70 #ifndef CONFIG_PREEMPTION
71 void rcu_all_qs(void);
74 /* RCUtree hotplug events */
75 int rcutree_prepare_cpu(unsigned int cpu
);
76 int rcutree_online_cpu(unsigned int cpu
);
77 int rcutree_offline_cpu(unsigned int cpu
);
78 int rcutree_dead_cpu(unsigned int cpu
);
79 int rcutree_dying_cpu(unsigned int cpu
);
80 void rcu_cpu_starting(unsigned int cpu
);
82 #endif /* __LINUX_RCUTREE_H */