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

From: Geert Uytterhoeven
Date: Mon Dec 09 2019 - 04:29:48 EST

Hi Marek,

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

Thank you!

Acked-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>

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



Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

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