[PATCH v2 5.10.y-cip 01/12] units: Add SI metric prefix definitions


Biju Das
 

From: Andy Shevchenko <andriy.shevchenko@...>

commit 26471d4a6cf8d5d0bd0fb55c7169de7d67cc703a upstream.

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@...>
Signed-off-by: Wolfram Sang <wsa@...>
Signed-off-by: Biju Das <biju.das.jz@...>
---
include/linux/units.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/include/linux/units.h b/include/linux/units.h
index aaf716364ec3..3457179f7116 100644
--- a/include/linux/units.h
+++ b/include/linux/units.h
@@ -4,6 +4,26 @@

#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
+
#define ABSOLUTE_ZERO_MILLICELSIUS -273150

static inline long milli_kelvin_to_millicelsius(long t)
--
2.25.1

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