1 /* $NetBSD: gfp.h,v 1.3 2021/12/19 11:03:32 riastradh Exp $ */
2
3 /*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Taylor R. Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #ifndef _LINUX_GFP_H_
33 #define _LINUX_GFP_H_
34
35 /* GFP: `Get Free Page' */
36
37 #include <sys/param.h>
38 #include <sys/cdefs.h>
39
40 typedef int gfp_t;
41
42 #define GFP_ATOMIC (__GFP_HIGH)
43 #define GFP_DMA32 (__GFP_DMA32)
44 #define GFP_HIGHUSER (__GFP_FS | __GFP_HARDWALL | __GFP_HIGHMEM | \
45 __GFP_IO | __GFP_WAIT)
46 #define GFP_KERNEL (__GFP_FS | __GFP_IO | __GFP_WAIT)
47 #define GFP_TEMPORARY (__GFP_FS | __GFP_IO | __GFP_RECLAIMABLE | __GFP_WAIT)
48 #define GFP_USER (__GFP_FS | __GFP_HARDWALL | __GFP_IO | __GFP_WAIT)
49
50 #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
51
52 #define __GFP_COMP __BIT(0)
53 #define __GFP_DMA32 __BIT(1)
54 #define __GFP_FS __BIT(2)
55 #define __GFP_HARDWALL __BIT(3)
56 #define __GFP_HIGH __BIT(4)
57 #define __GFP_HIGHMEM __BIT(5)
58 #define __GFP_IO __BIT(6)
59 #define __GFP_NORETRY __BIT(7)
60 #define __GFP_NOWARN __BIT(8)
61 #define __GFP_NO_KSWAPD __BIT(9)
62 #define __GFP_RECLAIMABLE __BIT(10)
63 #define __GFP_WAIT __BIT(11)
64 #define __GFP_ZERO __BIT(12)
65
66 /*
67 * XXX Linux sez nobody should be using this in new code. We never
68 * fail in the wait case anyway, so the point is moot.
69 */
70 #define __GFP_NOFAIL 0
71
72 /*
73 * Pretend these are the same. __GFP_RETRY_MAYFAIL is supposed to do
74 * more than just __GFP_NORETRY, but should not hang forever like
75 * __GFP_WAIT.
76 */
77 #define __GFP_RETRY_MAYFAIL __GFP_NORETRY
78
79 struct page;
80
81 static inline bool
gfpflags_allow_blocking(gfp_t gfp)82 gfpflags_allow_blocking(gfp_t gfp)
83 {
84 return (gfp & (__GFP_WAIT|__GFP_NORETRY)) == __GFP_WAIT;
85 }
86
87 #endif /* _LINUX_GFP_H_ */
88