/usr/src/lttng-modules-2.7.1/lib/align.h is in lttng-modules-dkms 2.7.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | #ifndef _LTTNG_ALIGN_H
#define _LTTNG_ALIGN_H
/*
* lib/align.h
*
* Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; only
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef __KERNEL__
#include <linux/types.h>
#include "bug.h"
#define ALIGN_FLOOR(x, a) __ALIGN_FLOOR_MASK(x, (typeof(x)) (a) - 1)
#define __ALIGN_FLOOR_MASK(x, mask) ((x) & ~(mask))
#define PTR_ALIGN_FLOOR(p, a) \
((typeof(p)) ALIGN_FLOOR((unsigned long) (p), a))
/*
* Align pointer on natural object alignment.
*/
#define object_align(obj) PTR_ALIGN(obj, __alignof__(*(obj)))
#define object_align_floor(obj) PTR_ALIGN_FLOOR(obj, __alignof__(*(obj)))
/**
* offset_align - Calculate the offset needed to align an object on its natural
* alignment towards higher addresses.
* @align_drift: object offset from an "alignment"-aligned address.
* @alignment: natural object alignment. Must be non-zero, power of 2.
*
* Returns the offset that must be added to align towards higher
* addresses.
*/
#define offset_align(align_drift, alignment) \
({ \
BUILD_RUNTIME_BUG_ON((alignment) == 0 \
|| ((alignment) & ((alignment) - 1))); \
(((alignment) - (align_drift)) & ((alignment) - 1)); \
})
/**
* offset_align_floor - Calculate the offset needed to align an object
* on its natural alignment towards lower addresses.
* @align_drift: object offset from an "alignment"-aligned address.
* @alignment: natural object alignment. Must be non-zero, power of 2.
*
* Returns the offset that must be substracted to align towards lower addresses.
*/
#define offset_align_floor(align_drift, alignment) \
({ \
BUILD_RUNTIME_BUG_ON((alignment) == 0 \
|| ((alignment) & ((alignment) - 1))); \
(((align_drift) - (alignment)) & ((alignment) - 1)); \
})
#endif /* __KERNEL__ */
#endif
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