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charset="utf-8" Add macros to convert between ratio and percentage related units, including percent (1/100), permille (1/1,000), permyriad (1/10,000, also equivalent to one Basis point) and per cent mille (1/100,000). Those are Used for precise fractional calculations in engineering, finance, and measurement applications. Signed-off-by: Jonathan Santos Reviewed-by: Andy Shevchenko --- v6 Changes: * Use Pattern PER* for all percentage-related macros. BASIS_POINTS is now PERMYRIAD. * Include macros for Per mille and per cent mille units. v5 Changes: * Included PERCENT macro along with BASIS_POINTS. * Adjusted commit description and comment in the code to add more context a= nd examples. v4 Changes: * New patch. --- include/linux/units.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/include/linux/units.h b/include/linux/units.h index 00e15de33eca..3471c5a38dcf 100644 --- a/include/linux/units.h +++ b/include/linux/units.h @@ -21,6 +21,25 @@ #define PICO 1000000000000ULL #define FEMTO 1000000000000000ULL =20 +/* + * Percentage and related scaling units + * + * These macros define scaling factors used to convert between ratio and + * percentage-based representations with different decimal resolutions. + * They are used for precise fractional calculations in engineering, finan= ce, + * and measurement applications. + * + * Examples: + * 1% =3D 0.01 =3D 1 / PERCENT + * 0.1% =3D 0.001 =3D 1 / PERMILLE + * 0.01% =3D 0.0001 =3D 1 / PERMYRIAD (1 basis point) + * 0.001% =3D 0.00001 =3D 1 / PERCENTMILLE + */ +#define PERCENT 100 +#define PERMILLE 1000 +#define PERMYRIAD 10000 +#define PERCENTMILLE 100000 + #define NANOHZ_PER_HZ 1000000000UL #define MICROHZ_PER_HZ 1000000UL #define MILLIHZ_PER_HZ 1000UL --=20 2.34.1