linux-kernel - Re: [PATCH] clk: explicitly disable CONFIG_UML_PCI_OVER

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Message-ID: <CAGS_qxpKB_H121kWrCjP6as_FA84ctUz=pv-aKFZq3mV7eqbnw@mail.gmail.com>
Date:   Tue, 26 Jul 2022 13:26:03 -0700
From:   Daniel Latypov <dlatypov@...gle.com>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     David Gow <davidgow@...gle.com>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        KUnit Development <kunit-dev@...glegroups.com>,
        linux-kselftest@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>,
        linux-clk@...r.kernel.org, Maxime Ripard <maxime@...no.tech>
Subject: Re: [PATCH] clk: explicitly disable CONFIG_UML_PCI_OVER_VIRTIO in .kunitconfig

On Tue, Jul 26, 2022 at 1:07 PM Stephen Boyd <sboyd@...nel.org> wrote:

> > The other option of using function redirection on the io read()
> > write() functions exists, and would be a bit simpler in the
> > short-term, but would probably result in a lot of tests reimplementing
> > this, and also would have some performance impacts, as the I/O
> > accesses wouldn't be able to be inlined if KUNIT is enabled.
> >
>
> That sounds OK to me because nobody is enabling KUNIT in production,
> right?

You'd think so, but...

Android GKI [1] is enabling it. I had thought as =m, but maybe it was =y.
I can't find a good link for it now, but e.g. here's a patch they're
carrying to prevent KUnit from running built-in tests [2]

They could just carry another patch if we go down this route, but it
goes to show that there might be others out there w/ reasons to do
this.

[1] https://source.android.com/devices/architecture/kernel/generic-kernel-image
[2] https://android.googlesource.com/kernel/common-patches/+/refs/heads/master/android-mainline/ANDROID-GKI-Disable-KUnit-built-in-testing.patch