From: Andy Shevchenko andriy.shevchenko@linux.intel.com
[ Upstream commit 26471d4a6cf8d5d0bd0fb55c7169de7d67cc703a ]
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 Stable-dep-of: c8c37bc51451 ("i2c: designware: use casting of u64 in clock multiplication to avoid overflow") Signed-off-by: Sasha Levin sashal@kernel.org --- include/linux/units.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/include/linux/units.h b/include/linux/units.h index 92c234e71cab..3457179f7116 100644 --- a/include/linux/units.h +++ b/include/linux/units.h @@ -4,6 +4,22 @@
#include <linux/kernel.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