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/* SPDX-License-Identifier: GPL-2.0+ */
* Read-Copy Update mechanism for mutual exclusion (tree-based version)
* Copyright IBM Corporation, 2008
* Author: Dipankar Sarma <>
* Paul E. McKenney <> Hierarchical algorithm
* Based on the original work by Paul McKenney <>
* and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
* For detailed explanation of Read-Copy Update mechanism see -
* Documentation/RCU
void rcu_softirq_qs(void);
void rcu_note_context_switch(bool preempt);
int rcu_needs_cpu(u64 basem, u64 *nextevt);
void rcu_cpu_stall_reset(void);
* Note a virtualization-based context switch. This is simply a
* wrapper around rcu_note_context_switch(), which allows TINY_RCU
* to save a few bytes. The caller must have disabled interrupts.
static inline void rcu_virt_note_context_switch(int cpu)
void synchronize_rcu_expedited(void);
void kvfree_call_rcu(struct rcu_head *head, rcu_callback_t func);
void rcu_barrier(void);
bool rcu_eqs_special_set(int cpu);
void rcu_momentary_dyntick_idle(void);
void kfree_rcu_scheduler_running(void);
bool rcu_gp_might_be_stalled(void);
unsigned long get_state_synchronize_rcu(void);
unsigned long start_poll_synchronize_rcu(void);
bool poll_state_synchronize_rcu(unsigned long oldstate);
void cond_synchronize_rcu(unsigned long oldstate);
void rcu_idle_enter(void);
void rcu_idle_exit(void);
void rcu_irq_enter(void);
void rcu_irq_exit(void);
void rcu_irq_enter_irqson(void);
void rcu_irq_exit_irqson(void);
bool rcu_is_idle_cpu(int cpu);
void rcu_irq_exit_check_preempt(void);
static inline void rcu_irq_exit_check_preempt(void) { }
void exit_rcu(void);
void rcu_scheduler_starting(void);
extern int rcu_scheduler_active __read_mostly;
void rcu_end_inkernel_boot(void);
bool rcu_inkernel_boot_has_ended(void);
bool rcu_is_watching(void);
void rcu_all_qs(void);
/* RCUtree hotplug events */
int rcutree_prepare_cpu(unsigned int cpu);
int rcutree_online_cpu(unsigned int cpu);
int rcutree_offline_cpu(unsigned int cpu);
int rcutree_dead_cpu(unsigned int cpu);
int rcutree_dying_cpu(unsigned int cpu);
void rcu_cpu_starting(unsigned int cpu);
#endif /* __LINUX_RCUTREE_H */