| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition. |
| * |
| * Copyright IBM Corporation, 2008 |
| * |
| * Author: Paul E. McKenney <paulmck@linux.ibm.com> |
| * |
| * For detailed explanation of Read-Copy Update mechanism see - |
| * Documentation/RCU |
| */ |
| #ifndef __LINUX_TINY_H |
| #define __LINUX_TINY_H |
| |
| #include <asm/param.h> /* for HZ */ |
| |
| unsigned long get_state_synchronize_rcu(void); |
| unsigned long start_poll_synchronize_rcu(void); |
| bool poll_state_synchronize_rcu(unsigned long oldstate); |
| |
| static inline void cond_synchronize_rcu(unsigned long oldstate) |
| { |
| might_sleep(); |
| } |
| |
| extern void rcu_barrier(void); |
| |
| static inline void synchronize_rcu_expedited(void) |
| { |
| synchronize_rcu(); |
| } |
| |
| /* |
| * Add one more declaration of kvfree() here. It is |
| * not so straight forward to just include <linux/mm.h> |
| * where it is defined due to getting many compile |
| * errors caused by that include. |
| */ |
| extern void kvfree(const void *addr); |
| |
| static inline void kvfree_call_rcu(struct rcu_head *head, rcu_callback_t func) |
| { |
| if (head) { |
| call_rcu(head, func); |
| return; |
| } |
| |
| // kvfree_rcu(one_arg) call. |
| might_sleep(); |
| synchronize_rcu(); |
| kvfree((void *) func); |
| } |
| |
| void rcu_qs(void); |
| |
| static inline void rcu_softirq_qs(void) |
| { |
| rcu_qs(); |
| } |
| |
| #define rcu_note_context_switch(preempt) \ |
| do { \ |
| rcu_qs(); \ |
| rcu_tasks_qs(current, (preempt)); \ |
| } while (0) |
| |
| static inline int rcu_needs_cpu(u64 basemono, u64 *nextevt) |
| { |
| *nextevt = KTIME_MAX; |
| return 0; |
| } |
| |
| /* |
| * Take advantage of the fact that there is only one CPU, which |
| * allows us to ignore virtualization-based context switches. |
| */ |
| static inline void rcu_virt_note_context_switch(int cpu) { } |
| static inline void rcu_cpu_stall_reset(void) { } |
| static inline int rcu_jiffies_till_stall_check(void) { return 21 * HZ; } |
| static inline void rcu_idle_enter(void) { } |
| static inline void rcu_idle_exit(void) { } |
| static inline void rcu_irq_enter(void) { } |
| static inline void rcu_irq_exit_irqson(void) { } |
| static inline void rcu_irq_enter_irqson(void) { } |
| static inline void rcu_irq_exit(void) { } |
| static inline void rcu_irq_exit_check_preempt(void) { } |
| #define rcu_is_idle_cpu(cpu) \ |
| (is_idle_task(current) && !in_nmi() && !in_irq() && !in_serving_softirq()) |
| static inline void exit_rcu(void) { } |
| static inline bool rcu_preempt_need_deferred_qs(struct task_struct *t) |
| { |
| return false; |
| } |
| static inline void rcu_preempt_deferred_qs(struct task_struct *t) { } |
| #ifdef CONFIG_SRCU |
| void rcu_scheduler_starting(void); |
| #else /* #ifndef CONFIG_SRCU */ |
| static inline void rcu_scheduler_starting(void) { } |
| #endif /* #else #ifndef CONFIG_SRCU */ |
| static inline void rcu_end_inkernel_boot(void) { } |
| static inline bool rcu_inkernel_boot_has_ended(void) { return true; } |
| static inline bool rcu_is_watching(void) { return true; } |
| static inline void rcu_momentary_dyntick_idle(void) { } |
| static inline void kfree_rcu_scheduler_running(void) { } |
| static inline bool rcu_gp_might_be_stalled(void) { return false; } |
| |
| /* Avoid RCU read-side critical sections leaking across. */ |
| static inline void rcu_all_qs(void) { barrier(); } |
| |
| /* RCUtree hotplug events */ |
| #define rcutree_prepare_cpu NULL |
| #define rcutree_online_cpu NULL |
| #define rcutree_offline_cpu NULL |
| #define rcutree_dead_cpu NULL |
| #define rcutree_dying_cpu NULL |
| static inline void rcu_cpu_starting(unsigned int cpu) { } |
| |
| #endif /* __LINUX_RCUTINY_H */ |