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5fc174c52f
Implement container_of_const() needed for wireless driver updates. Sponsored by: The FreeBSD Foundation Reviewed by: emaste Differential Revision: https://reviews.freebsd.org/D49999 (cherry picked from commit 6841b9987e83fdd9a5b05ceafc20811469222d8b)
54 lines
2 KiB
C
54 lines
2 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) 2017 Matt Macy <mmacy@FreeBSD.org>
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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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#ifndef _LINUXKPI_LINUX_CONTAINER_OF_H
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#define _LINUXKPI_LINUX_CONTAINER_OF_H
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#include <sys/stdint.h>
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#include <linux/build_bug.h>
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#include <linux/stddef.h>
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#define container_of(ptr, type, member) \
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({ \
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const __typeof(((type *)0)->member) *__p = (ptr); \
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(type *)((uintptr_t)__p - offsetof(type, member)); \
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})
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#define container_of_const(ptr, type, member) \
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_Generic(ptr, \
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const typeof(*(ptr)) *: \
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(const type *)container_of(ptr, type, member), \
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default: \
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container_of(ptr, type, member) \
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)
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#define typeof_member(type, member) __typeof(((type *)0)->member)
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#endif
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