On Tue, Aug 20, 2024 at 05:06:39PM +0300, Andy Shevchenko wrote: > On Tue, Aug 20, 2024 at 04:12:46PM +0300, Raag Jadav wrote: > > On Tue, Aug 20, 2024 at 01:23:35PM +0300, Andy Shevchenko wrote: > > > On Tue, Aug 20, 2024 at 11:50:10AM +0530, Raag Jadav wrote: > > > > > > But it still has an issue with 64-bit division on 32-bit platforms, right? > > > > > > > + /* > > > > + * Calculate fan speed in RPM by time averaging two subsequent > > > > + * readings in minutes. > > > > + * RPM = number of rotations * msecs per minute / time in msecs > > > > + */ > > > > + *val = DIV_ROUND_UP(rotations * (MSEC_PER_SEC * 60), time); > > > > > > ...somewhere here? > > > > Use div64_u64() instead? Or is there a better alternative? > > I don't know the code well to offer anything better. Probably for a starter > you can switch to use DIV_ROUND_UP_ULL(). This one seems to work. Does it warrant an explanation here? Raag
