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https://github.com/opnsense/src.git
synced 2026-02-17 17:49:34 -05:00
e6bc24b038
This unbreak drm-kmod build. the const is part of Linux API Unfortunately drm-kmod uses hand-rolled refcount* calls on a kref object. For now go the easy route of keeping it operational by casting stuff internally. The general goal here is to make FreeBSD refcount API use an opaque type, hence the ongoing removal of hand-rolled accesses. Reported by: emaste
132 lines
3.3 KiB
C
132 lines
3.3 KiB
C
/*-
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* Copyright (c) 2010 Isilon Systems, Inc.
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* Copyright (c) 2010 iX Systems, Inc.
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* Copyright (c) 2010 Panasas, Inc.
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* Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
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* Copyright (c) 2013 François Tigeot
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _LINUXKPI_LINUX_KREF_H_
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#define _LINUXKPI_LINUX_KREF_H_
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#include <sys/types.h>
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#include <sys/refcount.h>
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#include <linux/compiler.h>
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#include <linux/kernel.h>
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#include <linux/mutex.h>
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#include <linux/refcount.h>
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#include <asm/atomic.h>
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struct kref {
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/* XXX In Linux this is a refcount_t */
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atomic_t refcount;
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};
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static inline void
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kref_init(struct kref *kref)
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{
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refcount_init((uint32_t *)&kref->refcount, 1);
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}
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static inline unsigned int
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kref_read(const struct kref *kref)
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{
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return (refcount_load(__DECONST(u_int32_t *, &kref->refcount)));
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}
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static inline void
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kref_get(struct kref *kref)
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{
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refcount_acquire((uint32_t *)&kref->refcount);
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}
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static inline int
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kref_put(struct kref *kref, void (*rel)(struct kref *kref))
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{
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if (refcount_release((uint32_t *)&kref->refcount)) {
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rel(kref);
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return 1;
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}
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return 0;
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}
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static inline int
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kref_put_lock(struct kref *kref, void (*rel)(struct kref *kref),
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spinlock_t *lock)
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{
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if (refcount_release((uint32_t *)&kref->refcount)) {
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spin_lock(lock);
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rel(kref);
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return (1);
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}
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return (0);
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}
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static inline int
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kref_sub(struct kref *kref, unsigned int count,
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void (*rel)(struct kref *kref))
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{
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while (count--) {
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if (refcount_release((uint32_t *)&kref->refcount)) {
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rel(kref);
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return 1;
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}
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}
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return 0;
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}
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static inline int __must_check
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kref_get_unless_zero(struct kref *kref)
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{
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return refcount_acquire_if_not_zero((uint32_t *)&kref->refcount);
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}
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static inline int kref_put_mutex(struct kref *kref,
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void (*release)(struct kref *kref), struct mutex *lock)
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{
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WARN_ON(release == NULL);
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if (unlikely(!refcount_release_if_not_last((uint32_t *)&kref->refcount))) {
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mutex_lock(lock);
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if (unlikely(!refcount_release((uint32_t *)&kref->refcount))) {
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mutex_unlock(lock);
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return 0;
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}
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release(kref);
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return 1;
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}
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return 0;
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}
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#endif /* _LINUXKPI_LINUX_KREF_H_ */
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