Re: distro support for CONFIG_KUNIT: [PATCH 0/3] bitmap: convert self-test to KUnit

On Mon, Feb 10, 2025 at 12:46 PM David Hildenbrand [off-list ref] wrote:

On 10.02.25 20:35, John Hubbard wrote:

quoted

On 2/9/25 11:54 PM, Geert Uytterhoeven wrote:

quoted

On Sat, 8 Feb 2025 at 18:53, Yury Norov [off-list ref] wrote:

quoted

On Fri, Feb 07, 2025 at 03:14:01PM -0500, Tamir Duberstein wrote:

quoted

On 7/27/24 12:35 AM, Shuah Khan wrote:

...

quoted

quoted

quoted

The crux of the argument seems to be that the config help text is taken
to describe the author's intent with the fragment "at boot". I think

IMO, "at boot" is a misnomer, as most tests can be either builtin
or modular.

Right.

quoted

quoted

KUNIT is disabled in defconfig, at least on x86_64. It is also disabled
on my Ubuntu 24.04 machine. If I take your patches, I'll be unable to

OK so I just bought a shiny new test machine, and installed one of the
big name distros on it, hoping they've moved ahead and bought into the kunit
story...

$ grep KUNIT /boot/config-6.8.0-52-generic
# CONFIG_KUNIT is not set

...gagghh! No such luck. One more data point, in support of Yuri's complaint. :)

quoted

I think distros should start setting CONFIG_KUNIT=m.

Yes they should! kunit really does have important advantages for many use
cases, including bitmaps here, and "CONFIG_KUNIT is not set" is the main
obstacle.

 > > Let me add a few people to Cc who might be able to influence some
distros.

quoted

thanks,

Fedora has it.

CS-10 has it (-> RHEL-10):
redhat/configs/common/generic/CONFIG_KUNIT:CONFIG_KUNIT=m

https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-10/-/blob/main/redhat/configs/common/generic/CONFIG_KUNIT?ref_type=heads

CS-9 has it (-> RHEL-9):
redhat/configs/common/generic/CONFIG_KUNIT:CONFIG_KUNIT=m

https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/blob/main/redhat/configs/common/generic/CONFIG_KUNIT?ref_type=heads

So I think from the RH side everything is properly set?

Let me CC Nico, he did some KUNIT work in the past.

Yeah that is correct! I enabled KUNIT in our environments a few years
ago. We enable it as a module and use our own wrapper to exercise the
code. For RHEL and Centos these kunit modules are only shipped
internally for testing; However fedora-rawhide makes these modules
available in the kernel-modules-internal package.

To test this you can follow this to install rawhide-vm:
https://developer.fedoraproject.org/tools/virt-builder/about.html
then inside the vm:
    yum install kernel-modules-internal
    add the kunit.enable=1 to the cmdline
    reboot vm
    modprobe kunit
    modprobe <test_name>

Hopefully that helps!
-- Nico

--
Cheers,

David / dhildenb