1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Read-Copy Update mechanism for mutual exclusion (tree-based version) 4 * 5 * Copyright IBM Corporation, 2008 6 * 7 * Author: Dipankar Sarma <dipankar@in.ibm.com> 8 * Paul E. McKenney <paulmck@linux.ibm.com> Hierarchical algorithm 9 * 10 * Based on the original work by Paul McKenney <paulmck@linux.ibm.com> 11 * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen. 12 * 13 * For detailed explanation of Read-Copy Update mechanism see - 14 * Documentation/RCU 15 */ 16 17 #ifndef __LINUX_RCUTREE_H 18 #define __LINUX_RCUTREE_H 19 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); 24 25 /* 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. 29 */ rcu_virt_note_context_switch(int cpu)30static inline void rcu_virt_note_context_switch(int cpu) 31 { 32 rcu_note_context_switch(false); 33 } 34 35 void synchronize_rcu_expedited(void); 36 void kfree_call_rcu(struct rcu_head *head, rcu_callback_t func); 37 38 void rcu_barrier(void); 39 bool rcu_eqs_special_set(int cpu); 40 unsigned long get_state_synchronize_rcu(void); 41 void cond_synchronize_rcu(unsigned long oldstate); 42 43 void rcu_idle_enter(void); 44 void rcu_idle_exit(void); 45 void rcu_irq_enter(void); 46 void rcu_irq_exit(void); 47 void rcu_irq_enter_irqson(void); 48 void rcu_irq_exit_irqson(void); 49 50 void exit_rcu(void); 51 52 void rcu_scheduler_starting(void); 53 extern int rcu_scheduler_active __read_mostly; 54 void rcu_end_inkernel_boot(void); 55 bool rcu_is_watching(void); 56 #ifndef CONFIG_PREEMPTION 57 void rcu_all_qs(void); 58 #endif 59 60 /* RCUtree hotplug events */ 61 int rcutree_prepare_cpu(unsigned int cpu); 62 int rcutree_online_cpu(unsigned int cpu); 63 int rcutree_offline_cpu(unsigned int cpu); 64 int rcutree_dead_cpu(unsigned int cpu); 65 int rcutree_dying_cpu(unsigned int cpu); 66 void rcu_cpu_starting(unsigned int cpu); 67 68 #endif /* __LINUX_RCUTREE_H */ 69
