Re: [PATCH] thunderbolt: test: get running under UML, add kunitconfig

[Daniel Latypov]

On Mon, Feb 14, 2022 at 10:41 AM Daniel Latypov <dlatypov@xxxxxxxxxx> wrote:
>
> These tests didn't work under the normal `kunit.py run` command since
> they require CONFIG_PCI=y, which could not be set on ARCH=um.
>
> Commit 68f5d3f3b654 ("um: add PCI over virtio emulation driver") lets us
> do so. To make it so people don't have to figure out how to do so, we
> add a drivers/thunderbolt/.kunitconfig.
>
> Can now run these tests using
> $ ./tools/testing/kunit/kunit.py run --kunitconfig=drivers/thunderbolt
>
> Potentially controversial bits:
> 1. this .kunitconfig is UML-specific, can't do this for example
> $ ./tools/testing/kunit/kunit.py run --arch=x86_64 --kunitconfig=drivers/thunderbolt
> 2. this removes the manual call to __kunit_test_suites_init(), which
>    allowed us to control exactly when the tests got run.

kernel-test-robot points out something I had forgotten.
Doing this prevents us from being able to build this test as a module.

kunit_test_suites() defines an init_module() which conflicts with the
existing ones.

There's some relevant discussion about reworking how kunit modules
work here, https://lore.kernel.org/linux-kselftest/e5fa413ed59083ca63f3479d507b972380da0dcf.camel@xxxxxxxxxxxxxxxxxxxx/

So I think we have two options for this patch:
a) proceed, but disable building the test as a module for now (tristate => bool)
b) wait on this patch until kunit module support is refactored

Basically the question is: does this slightly easier way of running
the test seem worth losing the ability to test as a module in the
short-term?