1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0+ */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Read-Copy Update mechanism for mutual exclusion (tree-based version) 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright IBM Corporation, 2008 6*4882a593Smuzhiyun * 7*4882a593Smuzhiyun * Author: Dipankar Sarma <dipankar@in.ibm.com> 8*4882a593Smuzhiyun * Paul E. McKenney <paulmck@linux.ibm.com> Hierarchical algorithm 9*4882a593Smuzhiyun * 10*4882a593Smuzhiyun * Based on the original work by Paul McKenney <paulmck@linux.ibm.com> 11*4882a593Smuzhiyun * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen. 12*4882a593Smuzhiyun * 13*4882a593Smuzhiyun * For detailed explanation of Read-Copy Update mechanism see - 14*4882a593Smuzhiyun * Documentation/RCU 15*4882a593Smuzhiyun */ 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun #ifndef __LINUX_RCUTREE_H 18*4882a593Smuzhiyun #define __LINUX_RCUTREE_H 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun void rcu_softirq_qs(void); 21*4882a593Smuzhiyun void rcu_note_context_switch(bool preempt); 22*4882a593Smuzhiyun int rcu_needs_cpu(u64 basem, u64 *nextevt); 23*4882a593Smuzhiyun void rcu_cpu_stall_reset(void); 24*4882a593Smuzhiyun 25*4882a593Smuzhiyun /* 26*4882a593Smuzhiyun * Note a virtualization-based context switch. This is simply a 27*4882a593Smuzhiyun * wrapper around rcu_note_context_switch(), which allows TINY_RCU 28*4882a593Smuzhiyun * to save a few bytes. The caller must have disabled interrupts. 29*4882a593Smuzhiyun */ rcu_virt_note_context_switch(int cpu)30*4882a593Smuzhiyunstatic inline void rcu_virt_note_context_switch(int cpu) 31*4882a593Smuzhiyun { 32*4882a593Smuzhiyun rcu_note_context_switch(false); 33*4882a593Smuzhiyun } 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun void synchronize_rcu_expedited(void); 36*4882a593Smuzhiyun void kvfree_call_rcu(struct rcu_head *head, rcu_callback_t func); 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun void rcu_barrier(void); 39*4882a593Smuzhiyun bool rcu_eqs_special_set(int cpu); 40*4882a593Smuzhiyun void rcu_momentary_dyntick_idle(void); 41*4882a593Smuzhiyun void kfree_rcu_scheduler_running(void); 42*4882a593Smuzhiyun bool rcu_gp_might_be_stalled(void); 43*4882a593Smuzhiyun unsigned long get_state_synchronize_rcu(void); 44*4882a593Smuzhiyun void cond_synchronize_rcu(unsigned long oldstate); 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun void rcu_idle_enter(void); 47*4882a593Smuzhiyun void rcu_idle_exit(void); 48*4882a593Smuzhiyun void rcu_irq_enter(void); 49*4882a593Smuzhiyun void rcu_irq_exit(void); 50*4882a593Smuzhiyun void rcu_irq_exit_preempt(void); 51*4882a593Smuzhiyun void rcu_irq_enter_irqson(void); 52*4882a593Smuzhiyun void rcu_irq_exit_irqson(void); 53*4882a593Smuzhiyun 54*4882a593Smuzhiyun #ifdef CONFIG_PROVE_RCU 55*4882a593Smuzhiyun void rcu_irq_exit_check_preempt(void); 56*4882a593Smuzhiyun #else rcu_irq_exit_check_preempt(void)57*4882a593Smuzhiyunstatic inline void rcu_irq_exit_check_preempt(void) { } 58*4882a593Smuzhiyun #endif 59*4882a593Smuzhiyun 60*4882a593Smuzhiyun void exit_rcu(void); 61*4882a593Smuzhiyun 62*4882a593Smuzhiyun void rcu_scheduler_starting(void); 63*4882a593Smuzhiyun extern int rcu_scheduler_active __read_mostly; 64*4882a593Smuzhiyun void rcu_end_inkernel_boot(void); 65*4882a593Smuzhiyun bool rcu_inkernel_boot_has_ended(void); 66*4882a593Smuzhiyun bool rcu_is_watching(void); 67*4882a593Smuzhiyun #ifndef CONFIG_PREEMPTION 68*4882a593Smuzhiyun void rcu_all_qs(void); 69*4882a593Smuzhiyun #endif 70*4882a593Smuzhiyun 71*4882a593Smuzhiyun /* RCUtree hotplug events */ 72*4882a593Smuzhiyun int rcutree_prepare_cpu(unsigned int cpu); 73*4882a593Smuzhiyun int rcutree_online_cpu(unsigned int cpu); 74*4882a593Smuzhiyun int rcutree_offline_cpu(unsigned int cpu); 75*4882a593Smuzhiyun int rcutree_dead_cpu(unsigned int cpu); 76*4882a593Smuzhiyun int rcutree_dying_cpu(unsigned int cpu); 77*4882a593Smuzhiyun void rcu_cpu_starting(unsigned int cpu); 78*4882a593Smuzhiyun 79*4882a593Smuzhiyun #endif /* __LINUX_RCUTREE_H */ 80