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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128/* SPDX-License-Identifier: GPL-2.0+ *//* * Read-Copy Update mechanism for mutual exclusion (tree-based version) * * Copyright IBM Corporation, 2008 * * Author: Dipankar Sarma <dipankar@in.ibm.com> * Paul E. McKenney <paulmck@linux.ibm.com> Hierarchical algorithm * * Based on the original work by Paul McKenney <paulmck@linux.ibm.com> * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen. * * For detailed explanation of Read-Copy Update mechanism see - * Documentation/RCU */
#ifndef __LINUX_RCUTREE_H#define __LINUX_RCUTREE_H
void rcu_softirq_qs(void);void rcu_note_context_switch(bool preempt);int rcu_needs_cpu(void);void rcu_cpu_stall_reset(void);void rcu_request_urgent_qs_task(struct task_struct *t);
/* * 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(void){ rcu_note_context_switch(false);}
void synchronize_rcu_expedited(void);
void rcu_barrier(void);void rcu_momentary_eqs(void);
struct rcu_gp_oldstate { unsigned long rgos_norm; unsigned long rgos_exp;};
// Maximum number of rcu_gp_oldstate values corresponding to// not-yet-completed RCU grace periods.#define NUM_ACTIVE_RCU_POLL_FULL_OLDSTATE 4
/** * same_state_synchronize_rcu_full - Are two old-state values identical? * @rgosp1: First old-state value. * @rgosp2: Second old-state value. * * The two old-state values must have been obtained from either * get_state_synchronize_rcu_full(), start_poll_synchronize_rcu_full(), * or get_completed_synchronize_rcu_full(). Returns @true if the two * values are identical and @false otherwise. This allows structures * whose lifetimes are tracked by old-state values to push these values * to a list header, allowing those structures to be slightly smaller. * * Note that equality is judged on a bitwise basis, so that an * @rcu_gp_oldstate structure with an already-completed state in one field * will compare not-equal to a structure with an already-completed state * in the other field. After all, the @rcu_gp_oldstate structure is opaque * so how did such a situation come to pass in the first place? */static inline bool same_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp1, struct rcu_gp_oldstate *rgosp2){ return rgosp1->rgos_norm == rgosp2->rgos_norm && rgosp1->rgos_exp == rgosp2->rgos_exp;}
unsigned long start_poll_synchronize_rcu_expedited(void);void start_poll_synchronize_rcu_expedited_full(struct rcu_gp_oldstate *rgosp);void cond_synchronize_rcu_expedited(unsigned long oldstate);void cond_synchronize_rcu_expedited_full(struct rcu_gp_oldstate *rgosp);unsigned long get_state_synchronize_rcu(void);void get_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp);unsigned long start_poll_synchronize_rcu(void);void start_poll_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp);bool poll_state_synchronize_rcu(unsigned long oldstate);bool poll_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp);void cond_synchronize_rcu(unsigned long oldstate);void cond_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp);
#ifdef CONFIG_PROVE_RCUvoid rcu_irq_exit_check_preempt(void);#elsestatic inline void rcu_irq_exit_check_preempt(void) { }#endif
struct task_struct;void rcu_preempt_deferred_qs(struct task_struct *t);
void exit_rcu(void);
void rcu_scheduler_starting(void);extern int rcu_scheduler_active;void rcu_end_inkernel_boot(void);bool rcu_inkernel_boot_has_ended(void);bool rcu_is_watching(void);#ifndef CONFIG_PREEMPT_RCUvoid rcu_all_qs(void);#endif
/* RCUtree hotplug events */int rcutree_prepare_cpu(unsigned int cpu);int rcutree_online_cpu(unsigned int cpu);void rcutree_report_cpu_starting(unsigned int cpu);
#ifdef CONFIG_HOTPLUG_CPUint rcutree_dead_cpu(unsigned int cpu);int rcutree_dying_cpu(unsigned int cpu);int rcutree_offline_cpu(unsigned int cpu);#else#define rcutree_dead_cpu NULL#define rcutree_dying_cpu NULL#define rcutree_offline_cpu NULL#endif
void rcutree_migrate_callbacks(int cpu);
/* Called from hotplug and also arm64 early secondary boot failure */void rcutree_report_cpu_dead(void);
#endif /* __LINUX_RCUTREE_H */