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LinuxKPI: Add abs_diff to linux/math.h
It returns absolute value of the difference between the arguments. Add LinuxKPI version check as the macro was moved from drm-kmod to linux/math.h in Linux kernel commit 46f12960aad (6.6 timeframe). Sponsored by: Serenity Cyber Security, LLC MFC after: 1 week Reviewed by: bz, emaste Differential Revision: https://reviews.freebsd.org/D45453
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@ -5,6 +5,7 @@
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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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* Copyright (c) 2023 Serenity Cyber Security, LLC.
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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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@ -55,6 +56,14 @@
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__ret; \
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})
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#if defined(LINUXKPI_VERSION) && LINUXKPI_VERSION >= 60600
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#define abs_diff(x, y) ({ \
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__typeof(x) _x = (x); \
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__typeof(y) _y = (y); \
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_x > _y ? _x - _y : _y - _x; \
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})
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#endif
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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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