118 строки
3.3 KiB
C
118 строки
3.3 KiB
C
/* 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(void)
|
|
{
|
|
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_hardirq() && !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 */
|