# Re: \[PATCH v2 1/4\] selftests: add tests\_sysfs module

- From: Luis Chamberlain \<mcgrof@kernel.org\>
- Date: 2021-07-23 17:32:59 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/07/1456194
- Thread: https://ratatoskr.run/linux-block/2021/07/1431817/t.md

```text
On Fri, Jul 23, 2021 at 12:38:27PM +0200, Greg KH wrote:
> On Thu, Jul 22, 2021 at 03:34:49PM -0700, Luis Chamberlain wrote:
> > kunit relies on UML and UML is a simple one core architecture, to start
> > with.
> 
> I thought the UML requirement was long gone, are you sure it is still
> present?

It's *the* way to run kunit.

> > This means I cannot run tests for multicore with it, which is
> > where many races do happen! Yes, you can run kunit on other
> > architectures, but all that is new.
> 
> What do you mean by "new"?  It should work today, in today's kernel
> tree, right?

That was experimental. And I know no one using it.

> > In this case kunit is not ideal given I want to mimic something in
> > userspace interaction, and expose races through error injection and
> > if we can use as many cores to busy races out.
> 
> Can you not do that with kunit?  If not, why not?

kunit requires codifying everything in C, what we need is a lot of
flexibility to do all sorts of races in userspace, and actually use
userspace tools.

I am *not* going to even try to rewrite my selftest as a kunit test.
It is just not going to happen.

  Luis
```