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units: Add SI metric prefix definitions

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Sometimes it's useful to have well-defined SI metric prefix to be used
to self-describe the formulas or equations.

List most popular ones in the units.h.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Andy Shevchenko 2021-07-12 17:20:25 +03:00 committed by Wolfram Sang
parent a2c21668a0
commit 26471d4a6c
1 changed files with 16 additions and 0 deletions
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16
include/linux/units.h
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@ -4,6 +4,22 @@
#include <linux/math.h>
/* Metric prefixes in accordance with Système international (d'unités) */
#define PETA 1000000000000000ULL
#define TERA 1000000000000ULL
#define GIGA 1000000000UL
#define MEGA 1000000UL
#define KILO 1000UL
#define HECTO 100UL
#define DECA 10UL
#define DECI 10UL
#define CENTI 100UL
#define MILLI 1000UL
#define MICRO 1000000UL
#define NANO 1000000000UL
#define PICO 1000000000000ULL
#define FEMTO 1000000000000000ULL
#define MILLIWATT_PER_WATT 1000L
#define MICROWATT_PER_MILLIWATT 1000L
#define MICROWATT_PER_WATT 1000000L