On Wed, Dec 22, 2021 at 5:47 AM Liam Beguin [off-list ref] wrote:

From: Liam Beguin <redacted>

The iio-rescale driver supports various combinations of scale types and
offsets. These can often result in large integer multiplications. Make
sure these calculations are done right by adding a set of kunit test
cases that build on top of iio-test-format.

...

+       int fract_mult = 100000000LL;

Perhaps also change to use the prefix?

...

+       *nano = (s64)tmp * 10 * fract_mult + tmp2;

I'm also puzzled what the meaning of the 10 is here?

...

+       err = 1000000 * abs(exp - real);

Prefix?

...

+       err = div64_u64(err, abs(exp));
+       return (int)err;

return div64_u64();

-- 
With Best Regards,
Andy Shevchenko