| 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 */ |