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    SubjectRe: [RFC v4 00/17] kunit: introduce KUnit, the Linux kernel unit testing framework


    On 2019-03-21 4:07 p.m., Brendan Higgins wrote:
    > A couple of points, as for needing CONFIG_PCI; my plan to deal with
    > that type of thing has been that we would add support for a KUnit/UML
    > version that is just for KUnit. It would mock out the necessary bits
    > to provide a fake hardware implementation for anything that might
    > depend on it. I wrote a prototype for mocking/faking MMIO that I
    > presented to the list here[1]; it is not part of the current patchset
    > because we decided it would be best to focus on getting an MVP in, but
    > I plan on bringing it back up at some point. Anyway, what do you
    > generally think of this approach?

    Yes, I was wondering if that might be possible. I think that's a great
    approach but it will unfortunately take a lot of work before larger
    swaths of the kernel are testable in Kunit with UML. Having more common
    mocked infrastructure will be great by-product of it though.

    > Awesome, I looked at the code you posted and it doesn't look like you
    > have had too many troubles. One thing that stood out to me, why did
    > you need to put it in the kunit/ dir?

    Yeah, writing the code was super easy. Only after, did I realized I
    couldn't get it to easily build.

    Putting it in the kunit directory was necessary because nothing in the
    NTB tree builds unless CONFIG_NTB is set (see drivers/Makefile) and
    CONFIG_NTB depends on CONFIG_PCI. I didn't experiment to see how hard it
    would be to set CONFIG_NTB without CONFIG_PCI; I assumed it would be tricky.

    > I am looking forward to see what you think!

    Generally, I'm impressed and want to see this work in upstream as soon
    as possible so I can start to make use of it!

    Logan

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