forked from mirrors/linux
b14ff274e8
Following the move of TREE_RCU implementation, let's move also the TINY_RCU one for consistency and subsequent refactoring. For simplicity, remove the separate inline __kvfree_call_rcu() as TINY_RCU is not meant for high-performance hardware anyway. Declare kvfree_call_rcu() in rcupdate.h to avoid header dependency issues. Also move the kvfree_rcu_barrier() declaration to slab.h Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com> Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Tested-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
144 lines
3.8 KiB
C
144 lines
3.8 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 */
|
|
|
|
struct rcu_gp_oldstate {
|
|
unsigned long rgos_norm;
|
|
};
|
|
|
|
// Maximum number of rcu_gp_oldstate values corresponding to
|
|
// not-yet-completed RCU grace periods.
|
|
#define NUM_ACTIVE_RCU_POLL_FULL_OLDSTATE 2
|
|
|
|
/*
|
|
* Are the two oldstate values the same? See the Tree RCU version for
|
|
* docbook header.
|
|
*/
|
|
static inline bool same_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp1,
|
|
struct rcu_gp_oldstate *rgosp2)
|
|
{
|
|
return rgosp1->rgos_norm == rgosp2->rgos_norm;
|
|
}
|
|
|
|
unsigned long get_state_synchronize_rcu(void);
|
|
|
|
static inline void get_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp)
|
|
{
|
|
rgosp->rgos_norm = get_state_synchronize_rcu();
|
|
}
|
|
|
|
unsigned long start_poll_synchronize_rcu(void);
|
|
|
|
static inline void start_poll_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp)
|
|
{
|
|
rgosp->rgos_norm = start_poll_synchronize_rcu();
|
|
}
|
|
|
|
bool poll_state_synchronize_rcu(unsigned long oldstate);
|
|
|
|
static inline bool poll_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp)
|
|
{
|
|
return poll_state_synchronize_rcu(rgosp->rgos_norm);
|
|
}
|
|
|
|
static inline void cond_synchronize_rcu(unsigned long oldstate)
|
|
{
|
|
might_sleep();
|
|
}
|
|
|
|
static inline void cond_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp)
|
|
{
|
|
cond_synchronize_rcu(rgosp->rgos_norm);
|
|
}
|
|
|
|
static inline unsigned long start_poll_synchronize_rcu_expedited(void)
|
|
{
|
|
return start_poll_synchronize_rcu();
|
|
}
|
|
|
|
static inline void start_poll_synchronize_rcu_expedited_full(struct rcu_gp_oldstate *rgosp)
|
|
{
|
|
rgosp->rgos_norm = start_poll_synchronize_rcu_expedited();
|
|
}
|
|
|
|
static inline void cond_synchronize_rcu_expedited(unsigned long oldstate)
|
|
{
|
|
cond_synchronize_rcu(oldstate);
|
|
}
|
|
|
|
static inline void cond_synchronize_rcu_expedited_full(struct rcu_gp_oldstate *rgosp)
|
|
{
|
|
cond_synchronize_rcu_expedited(rgosp->rgos_norm);
|
|
}
|
|
|
|
extern void rcu_barrier(void);
|
|
|
|
static inline void synchronize_rcu_expedited(void)
|
|
{
|
|
synchronize_rcu();
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static inline void rcu_request_urgent_qs_task(struct task_struct *t) { }
|
|
|
|
/*
|
|
* 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(void) { }
|
|
static inline void rcu_cpu_stall_reset(void) { }
|
|
static inline int rcu_jiffies_till_stall_check(void) { return 21 * HZ; }
|
|
static inline void rcu_irq_exit_check_preempt(void) { }
|
|
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) { }
|
|
void rcu_scheduler_starting(void);
|
|
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_eqs(void) { }
|
|
|
|
/* 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 rcutree_report_cpu_starting(unsigned int cpu) { }
|
|
|
|
#endif /* __LINUX_RCUTINY_H */
|