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

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Message-ID: <CAFd5g47bt5Aop2onFpzbcMmWNncxPg6Ju+nomZz33f4kEEHWZA@mail.gmail.com>
Date:   Wed, 13 Jul 2022 17:08:46 -0400
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     Daniel Latypov <dlatypov@...gle.com>
Cc:     davidgow@...gle.com, linux-kernel@...r.kernel.org,
        kunit-dev@...glegroups.com, linux-kselftest@...r.kernel.org,
        skhan@...uxfoundation.org, linux-clk@...r.kernel.org,
        sboyd@...nel.org, Maxime Ripard <maxime@...no.tech>
Subject: Re: [PATCH] clk: explicitly disable CONFIG_UML_PCI_OVER_VIRTIO in .kunitconfig

On Mon, Jul 11, 2022 at 12:27 PM 'Daniel Latypov' via KUnit
Development <kunit-dev@...glegroups.com> wrote:
>
> CONFIG_UML_PCI_OVER_VIRTIO=y is needed to enable CONFIG_PCI=y on UML.
> However, this causes test failures when running the clk tests, i.e.
> $ ./tools/testing/kunit/kunit.py run --kunitconfig=drivers/clk
>
> A snippet of the particular error is:
> >     ok 1 - clk_gate_test_parent_rate
> > ------------[ cut here ]------------
> > WARNING: CPU: 0 PID: 45 at lib/logic_iomem.c:141 __raw_readl+0x9f/0xd0
>
> This is triggered by this cast in the test:
>    143          ctx->fake_mem = (void __force __iomem *)&ctx->fake_reg;
> this seems to work except when logic iomem is enabled, i.e.
> CONFIG_INDIRECT_IOMEM=y.
>
> As a short-term fix, explicitly disable CONFIG_UML_PCI_OVER_VIRTIO in
> drivers/clk/.kunitconfig so we can enable it for everyone else by
> default in kunit.py.
>
> The long-term fix probably requires something more complicated, like
>   #ifdef CONFIG_INDIRECT_IOMEM
>     logic_iomem_add_region(...);
>   #endif
>
> Signed-off-by: Daniel Latypov <dlatypov@...gle.com>
> Reported-by: Maxime Ripard <maxime@...no.tech>
> Tested-by: Maxime Ripard <maxime@...no.tech>

Acked-by: Brendan Higgins <brendanhiggins@...gle.com>