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9cc3f82da4
To match Linux and allow direct linux/math.h inclusion. Sponsored by: Serenity Cyber Security, LLC MFC after: 1 week Reviewed by: bz Differential Revision: https://reviews.freebsd.org/D45452 (cherry picked from commit 588064e658d32f037854dd852b988728197a28de)
67 lines
2.7 KiB
C
67 lines
2.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
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* Copyright (c) 2014-2015 François Tigeot
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* Copyright (c) 2016 Matt Macy <mmacy@FreeBSD.org>
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* Copyright (c) 2019 Johannes Lundberg <johalun@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _LINUXKPI_LINUX_MATH_H_
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#define _LINUXKPI_LINUX_MATH_H_
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#include <linux/types.h>
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/*
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* This looks more complex than it should be. But we need to
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* get the type for the ~ right in round_down (it needs to be
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* as wide as the result!), and we want to evaluate the macro
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* arguments just once each.
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*/
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#define __round_mask(x, y) ((__typeof__(x))((y)-1))
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#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
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#define round_down(x, y) ((x) & ~__round_mask(x, y))
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#define DIV_ROUND_UP(x, n) howmany(x, n)
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#define DIV_ROUND_UP_ULL(x, n) DIV_ROUND_UP((unsigned long long)(x), (n))
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#define DIV_ROUND_DOWN_ULL(x, n) (((unsigned long long)(x) / (n)) * (n))
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#define DIV_ROUND_CLOSEST(x, divisor) (((x) + ((divisor) / 2)) / (divisor))
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#define DIV_ROUND_CLOSEST_ULL(x, divisor) ({ \
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__typeof(divisor) __d = (divisor); \
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unsigned long long __ret = (x) + (__d) / 2; \
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__ret /= __d; \
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__ret; \
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})
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static inline uintmax_t
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mult_frac(uintmax_t x, uintmax_t multiplier, uintmax_t divisor)
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{
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uintmax_t q = (x / divisor);
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uintmax_t r = (x % divisor);
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return ((q * multiplier) + ((r * multiplier) / divisor));
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}
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#endif /* _LINUXKPI_LINUX_MATH_H_ */
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