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137 lines
3.6 KiB
137 lines
3.6 KiB
/* |
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* Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, you can access it online at |
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* http://www.gnu.org/licenses/gpl-2.0.html. |
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* |
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* Copyright IBM Corporation, 2008 |
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* |
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* Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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* |
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* For detailed explanation of Read-Copy Update mechanism see - |
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* Documentation/RCU |
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*/ |
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#ifndef __LINUX_TINY_H |
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#define __LINUX_TINY_H |
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#include <linux/ktime.h> |
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struct rcu_dynticks; |
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static inline int rcu_dynticks_snap(struct rcu_dynticks *rdtp) |
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{ |
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return 0; |
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} |
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/* Never flag non-existent other CPUs! */ |
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static inline bool rcu_eqs_special_set(int cpu) { return false; } |
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static inline unsigned long get_state_synchronize_rcu(void) |
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{ |
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return 0; |
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} |
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static inline void cond_synchronize_rcu(unsigned long oldstate) |
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{ |
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might_sleep(); |
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} |
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static inline unsigned long get_state_synchronize_sched(void) |
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{ |
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return 0; |
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} |
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static inline void cond_synchronize_sched(unsigned long oldstate) |
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{ |
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might_sleep(); |
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} |
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extern void rcu_barrier_bh(void); |
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extern void rcu_barrier_sched(void); |
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static inline void synchronize_rcu_expedited(void) |
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{ |
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synchronize_sched(); /* Only one CPU, so pretty fast anyway!!! */ |
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} |
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static inline void rcu_barrier(void) |
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{ |
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rcu_barrier_sched(); /* Only one CPU, so only one list of callbacks! */ |
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} |
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static inline void synchronize_rcu_bh(void) |
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{ |
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synchronize_sched(); |
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} |
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static inline void synchronize_rcu_bh_expedited(void) |
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{ |
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synchronize_sched(); |
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} |
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static inline void synchronize_sched_expedited(void) |
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{ |
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synchronize_sched(); |
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} |
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static inline void kfree_call_rcu(struct rcu_head *head, |
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rcu_callback_t func) |
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{ |
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call_rcu(head, func); |
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} |
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#define rcu_note_context_switch(preempt) \ |
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do { \ |
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rcu_sched_qs(); \ |
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rcu_note_voluntary_context_switch_lite(current); \ |
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} while (0) |
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static inline int rcu_needs_cpu(u64 basemono, u64 *nextevt) |
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{ |
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*nextevt = KTIME_MAX; |
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return 0; |
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} |
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/* |
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* Take advantage of the fact that there is only one CPU, which |
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* allows us to ignore virtualization-based context switches. |
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*/ |
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static inline void rcu_virt_note_context_switch(int cpu) { } |
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static inline void rcu_cpu_stall_reset(void) { } |
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static inline void rcu_idle_enter(void) { } |
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static inline void rcu_idle_exit(void) { } |
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static inline void rcu_irq_enter(void) { } |
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static inline bool rcu_irq_enter_disabled(void) { return false; } |
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static inline void rcu_irq_exit_irqson(void) { } |
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static inline void rcu_irq_enter_irqson(void) { } |
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static inline void rcu_irq_exit(void) { } |
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static inline void exit_rcu(void) { } |
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#ifdef CONFIG_SRCU |
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void rcu_scheduler_starting(void); |
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#else /* #ifndef CONFIG_SRCU */ |
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static inline void rcu_scheduler_starting(void) { } |
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#endif /* #else #ifndef CONFIG_SRCU */ |
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static inline void rcu_end_inkernel_boot(void) { } |
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static inline bool rcu_is_watching(void) { return true; } |
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/* Avoid RCU read-side critical sections leaking across. */ |
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static inline void rcu_all_qs(void) { barrier(); } |
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/* RCUtree hotplug events */ |
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#define rcutree_prepare_cpu NULL |
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#define rcutree_online_cpu NULL |
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#define rcutree_offline_cpu NULL |
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#define rcutree_dead_cpu NULL |
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#define rcutree_dying_cpu NULL |
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#endif /* __LINUX_RCUTINY_H */
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