zfs/include/os/freebsd/linux/compiler.h

/*
 * Copyright (c) 2010 Isilon Systems, Inc.
 * Copyright (c) 2010 iXsystems, Inc.
 * Copyright (c) 2010 Panasas, Inc.
 * Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
 * Copyright (c) 2015 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_COMPILER_H_
#define	_LINUX_COMPILER_H_

#include <sys/cdefs.h>

#define	__user
#define	__kernel
#define	__safe
#define	__force
#define	__nocast
#define	__iomem
#define	__chk_user_ptr(x)		((void)0)
#define	__chk_io_ptr(x)			((void)0)
#define	__builtin_warning(x, y...)	(1)
#define	__acquires(x)
#define	__releases(x)
#define	__acquire(x)			do { } while (0)
#define	__release(x)			do { } while (0)
#define	__cond_lock(x, c)		(c)
#define	__bitwise
#define	__devinitdata
#define	__deprecated
#define	__init
#define	__initconst
#define	__devinit
#define	__devexit
#define	__exit
#define	__rcu
#define	__percpu
#define	__weak __weak_symbol
#define	__malloc
#define	___stringify(...)		#__VA_ARGS__
#define	__stringify(...)		___stringify(__VA_ARGS__)
#define	__attribute_const__		__attribute__((__const__))
#undef __always_inline
#define	__always_inline			inline
#define	noinline			__noinline
#define	____cacheline_aligned		__aligned(CACHE_LINE_SIZE)
#define	fallthrough			__attribute__((__fallthrough__))

#if !defined(_KERNEL) && !defined(_STANDALONE)
#define	likely(x)			__builtin_expect(!!(x), 1)
#define	unlikely(x)			__builtin_expect(!!(x), 0)
#endif
#define	typeof(x)			__typeof(x)

#define	uninitialized_var(x)		x = x
#define	__maybe_unused			__unused
#define	__always_unused			__unused
#define	__must_check			__result_use_check

#define	__printf(a, b)			__printflike(a, b)

#define	barrier()			__asm__ __volatile__("": : :"memory")
#define	smp_rmb()		rmb()
#define	___PASTE(a, b) a##b
#define	__PASTE(a, b) ___PASTE(a, b)

#define	ACCESS_ONCE(x)			(*(volatile __typeof(x) *)&(x))

#define	WRITE_ONCE(x, v) do {		\
	barrier();			\
	ACCESS_ONCE(x) = (v);		\
	barrier();			\
} while (0)

#define	lockless_dereference(p) READ_ONCE(p)

#define	_AT(T, X)	((T)(X))

#endif	/* _LINUX_COMPILER_H_ */