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author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2016-04-27 11:58:19 +0200 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2017-10-23 08:46:43 +0200 |
commit | 28ee86a9b0f2e980beeb637da4f787065c74a39e (patch) | |
tree | e2daa4e96e0488de2066fcb5f38e087c9a58f319 /rtemsbsd/powerpc/include/linux/kref.h | |
parent | powerpc: Fix warnings (diff) | |
download | rtems-libbsd-28ee86a9b0f2e980beeb637da4f787065c74a39e.tar.bz2 |
Import DPAA driver snapshot
Imported from Freescale Linux repository
git://git.freescale.com/ppc/upstream/linux.git
commit 2774c204cd8bfc56a200ff4dcdfc9cdf5b6fc161.
Linux compatibility layer is partly from FreeBSD.
Diffstat (limited to 'rtemsbsd/powerpc/include/linux/kref.h')
-rw-r--r-- | rtemsbsd/powerpc/include/linux/kref.h | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/rtemsbsd/powerpc/include/linux/kref.h b/rtemsbsd/powerpc/include/linux/kref.h new file mode 100644 index 00000000..de5ddaa4 --- /dev/null +++ b/rtemsbsd/powerpc/include/linux/kref.h @@ -0,0 +1,90 @@ +/*- + * Copyright (c) 2010 Isilon Systems, Inc. + * Copyright (c) 2010 iX Systems, Inc. + * Copyright (c) 2010 Panasas, Inc. + * Copyright (c) 2013-2015 Mellanox Technologies, Ltd. + * Copyright (c) 2013 François Tigeot + * All rights reserved. + * + * 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 unmodified, 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 ``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 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. + * + * $FreeBSD$ + */ +#ifndef _LINUX_KREF_H_ +#define _LINUX_KREF_H_ + +#include <sys/types.h> +#include <sys/refcount.h> + +#include <asm/atomic.h> + +struct kref { + atomic_t refcount; +}; + +static inline void +kref_init(struct kref *kref) +{ + + refcount_init(&kref->refcount.counter, 1); +} + +static inline void +kref_get(struct kref *kref) +{ + + refcount_acquire(&kref->refcount.counter); +} + +static inline int +kref_put(struct kref *kref, void (*rel)(struct kref *kref)) +{ + + if (refcount_release(&kref->refcount.counter)) { + rel(kref); + return 1; + } + return 0; +} + +static inline int +kref_sub(struct kref *kref, unsigned int count, + void (*rel)(struct kref *kref)) +{ + + while (count--) { + if (refcount_release(&kref->refcount.counter)) { + rel(kref); + return 1; + } + } + return 0; +} + +static inline int __must_check +kref_get_unless_zero(struct kref *kref) +{ + + return atomic_add_unless(&kref->refcount, 1, 0); +} + +#endif /* _LINUX_KREF_H_ */ |