staging: remove intel_sst driver
[zen-stable.git] / drivers / staging / lttng / lib / align.h
blob0b861000300c726ec2e0f242b1d31ca8d020ccde
1 #ifndef _LTTNG_ALIGN_H
2 #define _LTTNG_ALIGN_H
4 /*
5 * lib/align.h
7 * (C) Copyright 2010-2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 * Dual LGPL v2.1/GPL v2 license.
12 #ifdef __KERNEL__
14 #include <linux/types.h>
15 #include "bug.h"
17 #define ALIGN_FLOOR(x, a) __ALIGN_FLOOR_MASK(x, (typeof(x)) (a) - 1)
18 #define __ALIGN_FLOOR_MASK(x, mask) ((x) & ~(mask))
19 #define PTR_ALIGN_FLOOR(p, a) \
20 ((typeof(p)) ALIGN_FLOOR((unsigned long) (p), a))
23 * Align pointer on natural object alignment.
25 #define object_align(obj) PTR_ALIGN(obj, __alignof__(*(obj)))
26 #define object_align_floor(obj) PTR_ALIGN_FLOOR(obj, __alignof__(*(obj)))
28 /**
29 * offset_align - Calculate the offset needed to align an object on its natural
30 * alignment towards higher addresses.
31 * @align_drift: object offset from an "alignment"-aligned address.
32 * @alignment: natural object alignment. Must be non-zero, power of 2.
34 * Returns the offset that must be added to align towards higher
35 * addresses.
37 #define offset_align(align_drift, alignment) \
38 ({ \
39 BUILD_RUNTIME_BUG_ON((alignment) == 0 \
40 || ((alignment) & ((alignment) - 1))); \
41 (((alignment) - (align_drift)) & ((alignment) - 1)); \
44 /**
45 * offset_align_floor - Calculate the offset needed to align an object
46 * on its natural alignment towards lower addresses.
47 * @align_drift: object offset from an "alignment"-aligned address.
48 * @alignment: natural object alignment. Must be non-zero, power of 2.
50 * Returns the offset that must be substracted to align towards lower addresses.
52 #define offset_align_floor(align_drift, alignment) \
53 ({ \
54 BUILD_RUNTIME_BUG_ON((alignment) == 0 \
55 || ((alignment) & ((alignment) - 1))); \
56 (((align_drift) - (alignment)) & ((alignment) - 1); \
59 #endif /* __KERNEL__ */
61 #endif