LXR linux/include/linux/rcutree.h

   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
  20void rcu_softirq_qs(void);
  21void rcu_note_context_switch(bool preempt);
  22int rcu_needs_cpu(u64 basem, u64 *nextevt);
  23void 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 */
  30static inline void rcu_virt_note_context_switch(int cpu)
  31{
  32        rcu_note_context_switch(false);
  33}
  34
  35void synchronize_rcu_expedited(void);
  36void kfree_call_rcu(struct rcu_head *head, rcu_callback_t func);
  37
  38void rcu_barrier(void);
  39bool rcu_eqs_special_set(int cpu);
  40unsigned long get_state_synchronize_rcu(void);
  41void cond_synchronize_rcu(unsigned long oldstate);
  42
  43void rcu_idle_enter(void);
  44void rcu_idle_exit(void);
  45void rcu_irq_enter(void);
  46void rcu_irq_exit(void);
  47void rcu_irq_enter_irqson(void);
  48void rcu_irq_exit_irqson(void);
  49
  50void exit_rcu(void);
  51
  52void rcu_scheduler_starting(void);
  53extern int rcu_scheduler_active __read_mostly;
  54void rcu_end_inkernel_boot(void);
  55bool rcu_is_watching(void);
  56#ifndef CONFIG_PREEMPT
  57void rcu_all_qs(void);
  58#endif
  59
  60/* RCUtree hotplug events */
  61int rcutree_prepare_cpu(unsigned int cpu);
  62int rcutree_online_cpu(unsigned int cpu);
  63int rcutree_offline_cpu(unsigned int cpu);
  64int rcutree_dead_cpu(unsigned int cpu);
  65int rcutree_dying_cpu(unsigned int cpu);
  66void rcu_cpu_starting(unsigned int cpu);
  67
  68#endif /* __LINUX_RCUTREE_H */
  69