include/linux/rcutree.h

   1 /*
   2  * Read-Copy Update mechanism for mutual exclusion (tree-based version)
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, you can access it online at
  16  * http://www.gnu.org/licenses/gpl-2.0.html.
  17  *
  18  * Copyright IBM Corporation, 2008
  19  *
  20  * Author: Dipankar Sarma <dipankar@in.ibm.com>
  21  *         Paul E. McKenney <paulmck@linux.vnet.ibm.com> Hierarchical algorithm
  22  *
  23  * Based on the original work by Paul McKenney <paulmck@us.ibm.com>
  24  * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
  25  *
  26  * For detailed explanation of Read-Copy Update mechanism see -
  27  *      Documentation/RCU
  28  */
  29
  30 #ifndef __LINUX_RCUTREE_H
  31 #define __LINUX_RCUTREE_H
  32
  33 void rcu_softirq_qs(void);
  34 void rcu_note_context_switch(bool preempt);
  35 int rcu_needs_cpu(u64 basem, u64 *nextevt);
  36 void rcu_cpu_stall_reset(void);
  37
  38 /*
  39  * Note a virtualization-based context switch.  This is simply a
  40  * wrapper around rcu_note_context_switch(), which allows TINY_RCU
  41  * to save a few bytes. The caller must have disabled interrupts.
  42  */
  43 static inline void rcu_virt_note_context_switch(int cpu)
  44 {
  45         rcu_note_context_switch(false);
  46 }
  47
  48 void synchronize_rcu_expedited(void);
  49 void kfree_call_rcu(struct rcu_head *head, rcu_callback_t func);
  50
  51 void rcu_barrier(void);
  52 bool rcu_eqs_special_set(int cpu);
  53 unsigned long get_state_synchronize_rcu(void);
  54 void cond_synchronize_rcu(unsigned long oldstate);
  55
  56 void rcu_idle_enter(void);
  57 void rcu_idle_exit(void);
  58 void rcu_irq_enter(void);
  59 void rcu_irq_exit(void);
  60 void rcu_irq_enter_irqson(void);
  61 void rcu_irq_exit_irqson(void);
  62
  63 void exit_rcu(void);
  64
  65 void rcu_scheduler_starting(void);
  66 extern int rcu_scheduler_active __read_mostly;
  67 void rcu_end_inkernel_boot(void);
  68 bool rcu_is_watching(void);
  69 #ifndef CONFIG_PREEMPT
  70 void rcu_all_qs(void);
  71 #endif
  72
  73 /* RCUtree hotplug events */
  74 int rcutree_prepare_cpu(unsigned int cpu);
  75 int rcutree_online_cpu(unsigned int cpu);
  76 int rcutree_offline_cpu(unsigned int cpu);
  77 int rcutree_dead_cpu(unsigned int cpu);
  78 int rcutree_dying_cpu(unsigned int cpu);
  79 void rcu_cpu_starting(unsigned int cpu);
  80
  81 #endif /* __LINUX_RCUTREE_H */