[PATCH v1 1/5] math.h: Introduce data types for fractional numbers

Andy Shevchenko
2022-01-10T18:17:13Z

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: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---

May be pulled via IIO tree.

include/linux/math.h | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/include/linux/math.h b/include/linux/math.h
index 53674a327e39..439b8f0b9ebd 100644
--- a/include/linux/math.h
+++ b/include/linux/math.h
@@ -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.
--
2.34.1