linux-kernel - Re: [PATCH] arm: multi_v7_config: Restore debugfs support

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Message-ID: <CAJKOXPccvtbmvZKdR3OJu4ZVkgBmKhqt1jR36DCZvxWcmt46yQ@mail.gmail.com>
Date:   Mon, 9 Dec 2019 19:05:42 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Olof Johansson <olof@...om.net>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kusanagi Kouichi <slash@...auone-net.jp>,
        Arnd Bergmann <arnd@...db.de>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Kevin Hilman <khilman@...nel.org>
Subject: Re: [PATCH] arm: multi_v7_config: Restore debugfs support

On Mon, 9 Dec 2019 at 18:45, Olof Johansson <olof@...om.net> wrote:
>
> +Kevin, since this seems like something ideally we would see some
> coverage of from Kernel CI at some point.
>
>
> On Mon, Dec 9, 2019 at 1:29 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> >
> > Hi Marek,
> >
> > On Fri, Dec 6, 2019 at 1:51 PM Marek Szyprowski
> > <m.szyprowski@...sung.com> wrote:
> > > Commit fd7d58f0dbc3 ("ARM: multi_v7_defconfig: renormalize based on recent
> > > additions") removed explicit enable line for CONFIG_DEBUG_FS, because
> > > that feature has been selected by other enabled options: CONFIG_TRACING,
> > > which were enabled by CONFIG_PERF_EVENTS.
> > >
> > > In meantime, commit 0e4a459f56c3 ("tracing: Remove unnecessary DEBUG_FS
> > > dependency") removed the dependency between CONFIG_DEBUG_FS and
> > > CONFIG_TRACING, so CONFIG_DEBUG_FS is no longer enabled in default builds.
> > >
> > > Enable it again explicitly, as debugfs support is essential for various
> > > automated testing tools.
> >
> > ... and for systemd :-(
> >
> > E.g. with Debian 9 nfsroot:
> >
> >     [FAILED] Failed to mount /sys/kernel/debug.
> >     See 'systemctl status sys-kernel-debug.mount' for details.
> >     [DEPEND] Dependency failed for Local File Systems.
> >     ...
> >     You are in emergGive root password for maintenance
> >     (or press Control-D to continue):
> >
> > > Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> >
> > Thank you!
> >
> > Acked-by: Geert Uytterhoeven <geert+renesas@...der.be>
> >
> > This is gonna bite lots of people (and defconfigs)...
>
> Looks like the in-tree affected defconfigs are:
>
> olof@...d:~/work/arm-soc/arch/arm/configs (for-next) $ fgrep -L
> CONFIG_DEBUG_FS $(fgrep -l CONFIG_PERF_EVENTS *)
> aspeed_g4_defconfig
> aspeed_g5_defconfig
> exynos_defconfig

I picked up already Marek's patch for exynos_defconfig.

Best regards,
Krzysztof