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/*-
* Copyright (c) 2020 The FreeBSD Foundation
*
* This software was developed by Emmanuel Vadot under sponsorship
* from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _LINUXKPI_LINUX_REFCOUNT_H
#define _LINUXKPI_LINUX_REFCOUNT_H
#include <linux/atomic.h>
typedef atomic_t refcount_t;
static inline void
refcount_set(refcount_t *ref, unsigned int i)
{
atomic_set(ref, i);
}
static inline void
refcount_inc(refcount_t *ref)
{
atomic_inc(ref);
}
static inline bool
refcount_inc_not_zero(refcount_t *ref)
{
return (atomic_inc_not_zero(ref));
}
static inline void
refcount_dec(refcount_t *ref)
{
atomic_dec(ref);
}
static inline unsigned int
refcount_read(refcount_t *ref)
{
return atomic_read(ref);
}
static inline bool
refcount_dec_and_lock_irqsave(refcount_t *ref, spinlock_t *lock,
unsigned long *flags)
{
if (atomic_dec_and_test(ref) == true) {
spin_lock_irqsave(lock, flags);
return (true);
}
return (false);
}
static inline bool
refcount_dec_and_test(refcount_t *r)
{
return (atomic_dec_and_test(r));
}
#endif /* __LINUXKPI_LINUX_REFCOUNT_H__ */
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