2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
6 * Copyright (c) 2015 François Tigeot
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice unmodified, this list of conditions, and the following
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 #ifndef _LINUX_UACCESS_H_
33 #define _LINUX_UACCESS_H_
35 #include <linux/compiler.h>
37 #define __get_user(_x, _p) ({ \
39 __typeof(*(_p)) __x; \
40 __err = linux_copyin((_p), &(__x), sizeof(*(_p))); \
45 #define __put_user(_x, _p) ({ \
46 __typeof(*(_p)) __x = (_x); \
47 linux_copyout(&(__x), (_p), sizeof(*(_p))); \
49 #define get_user(_x, _p) linux_copyin((_p), &(_x), sizeof(*(_p)))
50 #define put_user(_x, _p) linux_copyout(&(_x), (_p), sizeof(*(_p)))
52 extern int linux_copyin(const void *uaddr, void *kaddr, size_t len);
53 extern int linux_copyout(const void *kaddr, void *uaddr, size_t len);
56 * NOTE: The returned value from pagefault_disable() must be stored
57 * and passed to pagefault_enable(). Else possible recursion on the
60 static inline int __must_check
61 pagefault_disable(void)
63 return (vm_fault_disable_pagefaults());
67 pagefault_enable(int save)
69 vm_fault_enable_pagefaults(save);
72 #endif /* _LINUX_UACCESS_H_ */