https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: d45331b00ddb179e291766617259261c112db872 authored by Linus Torvalds on 11 August 2019, 20:26:41 UTC
Linux 5.3-rc4
Linux 5.3-rc4
Tip revision: d45331b
rcu_sync.h
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* RCU-based infrastructure for lightweight reader-writer locking
*
* Copyright (c) 2015, Red Hat, Inc.
*
* Author: Oleg Nesterov <oleg@redhat.com>
*/
#ifndef _LINUX_RCU_SYNC_H_
#define _LINUX_RCU_SYNC_H_
#include <linux/wait.h>
#include <linux/rcupdate.h>
/* Structure to mediate between updaters and fastpath-using readers. */
struct rcu_sync {
int gp_state;
int gp_count;
wait_queue_head_t gp_wait;
struct rcu_head cb_head;
};
/**
* rcu_sync_is_idle() - Are readers permitted to use their fastpaths?
* @rsp: Pointer to rcu_sync structure to use for synchronization
*
* Returns true if readers are permitted to use their fastpaths. Must be
* invoked within some flavor of RCU read-side critical section.
*/
static inline bool rcu_sync_is_idle(struct rcu_sync *rsp)
{
RCU_LOCKDEP_WARN(!rcu_read_lock_held() &&
!rcu_read_lock_bh_held() &&
!rcu_read_lock_sched_held(),
"suspicious rcu_sync_is_idle() usage");
return !READ_ONCE(rsp->gp_state); /* GP_IDLE */
}
extern void rcu_sync_init(struct rcu_sync *);
extern void rcu_sync_enter_start(struct rcu_sync *);
extern void rcu_sync_enter(struct rcu_sync *);
extern void rcu_sync_exit(struct rcu_sync *);
extern void rcu_sync_dtor(struct rcu_sync *);
#define __RCU_SYNC_INITIALIZER(name) { \
.gp_state = 0, \
.gp_count = 0, \
.gp_wait = __WAIT_QUEUE_HEAD_INITIALIZER(name.gp_wait), \
}
#define DEFINE_RCU_SYNC(name) \
struct rcu_sync name = __RCU_SYNC_INITIALIZER(name)
#endif /* _LINUX_RCU_SYNC_H_ */