On Mon, Jun 07, 2021 at 03:33:31PM +0300, Jarkko Nikula wrote: > On 6/3/21 7:04 PM, Andy Shevchenko wrote: > > 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. ... > > +/* Metric prefixes in accordance with Système international (d'unités) */ > > +#define PETA 1000000000000000LL > > +#define TERA 1000000000000LL > > +#define GIGA 1000000000L > > +#define MEGA 1000000L > > +#define KILO 1000L > > +#define HECTO 100L > > +#define DECA 10L > > +#define DECI 10L > > +#define CENTI 100L > > +#define MILLI 1000L > > +#define MICRO 1000000L > > +#define NANO 1000000000L > > +#define PICO 1000000000000LL > > +#define FEMTO 1000000000000000LL > > For me milli is always 1/1000. For me as well. Kernel does not operate with float point numbers. That's why it's ordered like this. > Might lead to confusion with these defines if > idea is to multiply with KILO but divide with MILLI? If the author of the hypothetical driver doesn't understand this, maybe they can ask first, but I am an optimist here and I assume that whoever writes the driver for a sensor / etc has a minimum education to see what's needed for the certain case. -- With Best Regards, Andy Shevchenko
