[PATCH] arm: multi_v7_config: Restore debugfs support

[PATCH] arm: multi_v7_config: Restore debugfs support

[Marek Szyprowski]

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.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
 arch/arm/configs/multi_v7_defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/configs/multi_v7_defconfig b/arch/arm/configs/multi_v7_defconfig
index 24962d0e71c7..0ffa957f2c94 100644
--- a/arch/arm/configs/multi_v7_defconfig
+++ b/arch/arm/configs/multi_v7_defconfig
@@ -1121,3 +1121,4 @@ CONFIG_CRYPTO_DEV_ROCKCHIP=m
 CONFIG_CMA_SIZE_MBYTES=64
 CONFIG_PRINTK_TIME=y
 CONFIG_MAGIC_SYSRQ=y
+CONFIG_DEBUG_FS=y
-- 
2.17.1

Re: [PATCH] arm: multi_v7_config: Restore debugfs support

[Olof Johansson]

On Fri, Dec 6, 2019 at 4:51 AM Marek Szyprowski
<m.szyprowski@samsung.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.
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

Please cc patches you want us to apply to soc@kernel.org (and, if you
want, arm@kernel.org).

Applying. Thanks!


-Olof

Re: [PATCH] arm: multi_v7_config: Restore debugfs support

[Geert Uytterhoeven]

Hi Marek,

On Fri, Dec 6, 2019 at 1:51 PM Marek Szyprowski
<m.szyprowski@samsung.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@samsung.com>

Thank you!

Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>

This is gonna bite lots of people (and defconfigs)...

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH] arm: multi_v7_config: Restore debugfs support

[Olof Johansson]

+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@linux-m68k.org> wrote:
>
> Hi Marek,
>
> On Fri, Dec 6, 2019 at 1:51 PM Marek Szyprowski
> <m.szyprowski@samsung.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@samsung.com>
>
> Thank you!
>
> Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
>
> This is gonna bite lots of people (and defconfigs)...

Looks like the in-tree affected defconfigs are:

olof@quad:~/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
imx_v6_v7_defconfig
milbeaut_m10v_defconfig
mvebu_v7_defconfig
mxs_defconfig
oxnas_v6_defconfig
shmobile_defconfig
tegra_defconfig
olof@quad:~/work/arm-soc/arch/arm/configs (for-next) $

I'll revisit with patches for those later today.


-Olof

Re: [PATCH] arm: multi_v7_config: Restore debugfs support

[Krzysztof Kozlowski]

On Mon, 9 Dec 2019 at 18:45, Olof Johansson <olof@lixom.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@linux-m68k.org> wrote:
> >
> > Hi Marek,
> >
> > On Fri, Dec 6, 2019 at 1:51 PM Marek Szyprowski
> > <m.szyprowski@samsung.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@samsung.com>
> >
> > Thank you!
> >
> > Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
> >
> > This is gonna bite lots of people (and defconfigs)...
>
> Looks like the in-tree affected defconfigs are:
>
> olof@quad:~/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