Commit e820a337 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Jonathan Cameron
Browse files

math.h: Introduce data types for fractional numbers 



Introduce a macro to produce data types like

	struct TYPE_fract {
		__TYPE numerator;
		__TYPE denominator;
	};

to be used in the code wherever it's needed.

In the following changes convert some users to it.

Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220126135353.24007-1-andriy.shevchenko@linux.intel.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent de645b27

include/linux/math.h

+12 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ 
#ifndef _LINUX_MATH_H

#define _LINUX_MATH_H



#include <linux/types.h>

#include <asm/div64.h>

#include <uapi/linux/kernel.h>
@@ -106,6 +107,17 @@ 
}							\

)



#define __STRUCT_FRACT(type)				\

struct type##_fract {					\

	__##type numerator;				\

	__##type denominator;				\

};

__STRUCT_FRACT(s16)

__STRUCT_FRACT(u16)

__STRUCT_FRACT(s32)

__STRUCT_FRACT(u32)

#undef __STRUCT_FRACT



/*

 * Multiplies an integer by a fraction, while avoiding unnecessary

 * overflow or loss of precision.