1 /* SPDX-License-Identifier: GPL-2.0+ */ 1 2 /* 3 * Read-Copy Update mechanism for mutual exclu 4 * 5 * Copyright IBM Corporation, 2008 6 * 7 * Author: Dipankar Sarma <dipankar@in.ibm.com 8 * Paul E. McKenney <paulmck@linux.ibm 9 * 10 * Based on the original work by Paul McKenney 11 * and inputs from Rusty Russell, Andrea Arcan 12 * 13 * For detailed explanation of Read-Copy Updat 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(void); 23 void rcu_cpu_stall_reset(void); 24 void rcu_request_urgent_qs_task(struct task_st 25 26 /* 27 * Note a virtualization-based context switch. 28 * wrapper around rcu_note_context_switch(), w 29 * to save a few bytes. The caller must have d 30 */ 31 static inline void rcu_virt_note_context_switc 32 { 33 rcu_note_context_switch(false); 34 } 35 36 void synchronize_rcu_expedited(void); 37 void kvfree_call_rcu(struct rcu_head *head, vo 38 39 void rcu_barrier(void); 40 void rcu_momentary_dyntick_idle(void); 41 void kfree_rcu_scheduler_running(void); 42 bool rcu_gp_might_be_stalled(void); 43 44 struct rcu_gp_oldstate { 45 unsigned long rgos_norm; 46 unsigned long rgos_exp; 47 }; 48 49 // Maximum number of rcu_gp_oldstate values co 50 // not-yet-completed RCU grace periods. 51 #define NUM_ACTIVE_RCU_POLL_FULL_OLDSTATE 4 52 53 /** 54 * same_state_synchronize_rcu_full - Are two o 55 * @rgosp1: First old-state value. 56 * @rgosp2: Second old-state value. 57 * 58 * The two old-state values must have been obt 59 * get_state_synchronize_rcu_full(), start_pol 60 * or get_completed_synchronize_rcu_full(). R 61 * values are identical and @false otherwise. 62 * whose lifetimes are tracked by old-state va 63 * to a list header, allowing those structures 64 * 65 * Note that equality is judged on a bitwise b 66 * @rcu_gp_oldstate structure with an already- 67 * will compare not-equal to a structure with 68 * in the other field. After all, the @rcu_gp 69 * so how did such a situation come to pass in 70 */ 71 static inline bool same_state_synchronize_rcu_ 72 73 { 74 return rgosp1->rgos_norm == rgosp2->rg 75 } 76 77 unsigned long start_poll_synchronize_rcu_exped 78 void start_poll_synchronize_rcu_expedited_full 79 void cond_synchronize_rcu_expedited(unsigned l 80 void cond_synchronize_rcu_expedited_full(struc 81 unsigned long get_state_synchronize_rcu(void); 82 void get_state_synchronize_rcu_full(struct rcu 83 unsigned long start_poll_synchronize_rcu(void) 84 void start_poll_synchronize_rcu_full(struct rc 85 bool poll_state_synchronize_rcu(unsigned long 86 bool poll_state_synchronize_rcu_full(struct rc 87 void cond_synchronize_rcu(unsigned long oldsta 88 void cond_synchronize_rcu_full(struct rcu_gp_o 89 90 #ifdef CONFIG_PROVE_RCU 91 void rcu_irq_exit_check_preempt(void); 92 #else 93 static inline void rcu_irq_exit_check_preempt( 94 #endif 95 96 struct task_struct; 97 void rcu_preempt_deferred_qs(struct task_struc 98 99 void exit_rcu(void); 100 101 void rcu_scheduler_starting(void); 102 extern int rcu_scheduler_active; 103 void rcu_end_inkernel_boot(void); 104 bool rcu_inkernel_boot_has_ended(void); 105 bool rcu_is_watching(void); 106 #ifndef CONFIG_PREEMPTION 107 void rcu_all_qs(void); 108 #endif 109 110 /* RCUtree hotplug events */ 111 int rcutree_prepare_cpu(unsigned int cpu); 112 int rcutree_online_cpu(unsigned int cpu); 113 void rcutree_report_cpu_starting(unsigned int 114 115 #ifdef CONFIG_HOTPLUG_CPU 116 int rcutree_dead_cpu(unsigned int cpu); 117 int rcutree_dying_cpu(unsigned int cpu); 118 int rcutree_offline_cpu(unsigned int cpu); 119 #else 120 #define rcutree_dead_cpu NULL 121 #define rcutree_dying_cpu NULL 122 #define rcutree_offline_cpu NULL 123 #endif 124 125 void rcutree_migrate_callbacks(int cpu); 126 127 /* Called from hotplug and also arm64 early se 128 void rcutree_report_cpu_dead(void); 129 130 #endif /* __LINUX_RCUTREE_H */ 131
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