Re: [PATCH v11 11/15] iio: test: add basic tests for the iio-rescale driver

[Andy Shevchenko]

On Wed, Dec 22, 2021 at 5:47 AM Liam Beguin <liambeguin@xxxxxxxxx> wrote:
>
> From: Liam Beguin <lvb@xxxxxxxxxx>
>
> 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