2 * Copyright (C) 2010-2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * SPDX-License-Identifier: MIT
14 * Align value to the next multiple of align. Returns val if it already is a
15 * multiple of align. Align must be a power of two.
17 #define __lttng_align_ceil_mask(v, mask) (((v) + (mask)) & ~(mask))
19 #define lttng_align_ceil(v, align) __lttng_align_ceil_mask(v, (__typeof__(v)) (align) -1)
22 * Align value to the previous multiple of align. Returns val if it already is a
23 * multiple of align. Align must be a power of two.
25 #define __lttng_align_floor_mask(v, mask) ((v) & ~(mask))
27 #define lttng_align_floor(v, align) __lttng_align_floor_mask(v, (__typeof__(v)) (align) -1)
30 * lttng_offset_align - Calculate the offset needed to align an object on its natural
31 * alignment towards higher addresses.
32 * @align_drift: object offset from an "alignment"-aligned address.
33 * @alignment: natural object alignment. Must be non-zero, power of 2.
35 * Returns the offset that must be added to align towards higher
38 #define lttng_offset_align(align_drift, alignment) \
40 LTTNG_BUILD_RUNTIME_BUG_ON((alignment) == 0 || ((alignment) & ((alignment) -1))); \
41 (((alignment) - (align_drift)) & ((alignment) -1)); \
45 * lttng_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 lttng_offset_align_floor(align_drift, alignment) \
54 LTTNG_BUILD_RUNTIME_BUG_ON((alignment) == 0 || ((alignment) & ((alignment) -1))); \
55 (((align_drift) - (alignment)) & ((alignment) -1)); \
58 #endif /* _LTTNG_ALIGN_H */