linux-kernel - Re: [RFC v3 16/19] arch: um: make UML unflatten device tree when testing

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Date:   Wed, 28 Nov 2018 15:16:34 -0600
From:   Rob Herring <robh@...nel.org>
To:     Brendan Higgins <brendanhiggins@...gle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...gle.com>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>, shuah@...nel.org,
        Joel Stanley <joel@....id.au>,
        Michael Ellerman <mpe@...erman.id.au>,
        Joe Perches <joe@...ches.com>, brakmo@...com,
        Steven Rostedt <rostedt@...dmis.org>,
        "Bird, Timothy" <Tim.Bird@...y.com>,
        Kevin Hilman <khilman@...libre.com>,
        Julia Lawall <julia.lawall@...6.fr>,
        linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jeff Dike <jdike@...toit.com>,
        Richard Weinberger <richard@....at>,
        linux-um@...ts.infradead.org, Daniel Vetter <daniel@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Frank Rowand <frowand.list@...il.com>, knut.omang@...cle.com
Subject: Re: [RFC v3 16/19] arch: um: make UML unflatten device tree when testing

On Wed, Nov 28, 2018 at 1:38 PM Brendan Higgins
<brendanhiggins@...gle.com> wrote:
>
> Make UML unflatten any present device trees when running KUnit tests.
>
> Signed-off-by: Brendan Higgins <brendanhiggins@...gle.com>
> ---
>  arch/um/kernel/um_arch.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
> index a818ccef30ca2..bd58ae3bf4148 100644
> --- a/arch/um/kernel/um_arch.c
> +++ b/arch/um/kernel/um_arch.c
> @@ -13,6 +13,7 @@
>  #include <linux/sched.h>
>  #include <linux/sched/task.h>
>  #include <linux/kmsg_dump.h>
> +#include <linux/of_fdt.h>
>
>  #include <asm/pgtable.h>
>  #include <asm/processor.h>
> @@ -347,6 +348,9 @@ void __init setup_arch(char **cmdline_p)
>         read_initrd();
>
>         paging_init();
> +#if IS_ENABLED(CONFIG_OF_UNITTEST)
> +       unflatten_device_tree();
> +#endif

Kind of strange to have this in the arch code. I'd rather have this in
the unittest code if possible. Can we have an initcall conditional on
CONFIG_UM in the unittest do this? Side note, use a C if with
IS_ENABLED() whenever possible instead of pre-processor #if.

I'll take a fix separately as it was on my todo to fix. I've got the
unit tests running in a gitlab CI job now[1].

Rob

[1] https://gitlab.com/robherring/linux-dt-unittest/pipelines