Re: [f2fs-dev] [PATCH v1 3/5] treewide: use get_random_u32() when possible

Andy Shevchenko
2022-10-06T13:01:11Z

On Thu, Oct 06, 2022 at 06:33:15AM -0600, Jason A. Donenfeld wrote:
> On Thu, Oct 06, 2022 at 10:43:31AM +0200, Jan Kara wrote:

...

> > The code here is effectively doing the
> >
> > parent_group = prandom_u32_max(ngroups);
> >
> > Similarly here we can use prandom_u32_max(ngroups) like:
> >
> > if (qstr) {
> > ...
> > parent_group = hinfo.hash % ngroups;
> > } else
> > parent_group = prandom_u32_max(ngroups);
>
> Nice catch. I'll move these to patch #1.

I believe coccinelle is able to handle this kind of code as well, so Kees'
proposal to use it seems more plausible since it's less error prone and more
flexible / powerful.

--
With Best Regards,
Andy Shevchenko