linux-kernel - Re: [PATCH AUTOSEL 5.4 096/187] ARM: shmobile: defconfig: Restore debugfs support

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Date:   Thu, 9 Jan 2020 23:12:10 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH AUTOSEL 5.4 096/187] ARM: shmobile: defconfig: Restore
 debugfs support

Hi Sasha,

(replying with the same response to an email with broader audience)

On Fri, Dec 27, 2019 at 6:42 PM Sasha Levin <sashal@...nel.org> wrote:
>
> From: Geert Uytterhoeven <geert+renesas@...der.be>
>
> [ Upstream commit fa2cdb1762d15f701b83efa60b04f0d04e71bf89 ]
>
> Since commit 0e4a459f56c32d3e ("tracing: Remove unnecessary DEBUG_FS
> dependency"), CONFIG_DEBUG_FS is no longer auto-enabled.  This breaks

AFAIK, that commit is not present in v5.4, and hasn't been backported yet.
So I don't think there is a need to backport this and all other fixes restoring
debugfs support in post-v5.4 kernels.

BTW, I noticed you plan to backport this "fix" not just to v5.4, but also
to v4.19?

> booting Debian 9, as systemd needs debugfs:
>
>     [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):
>
> Fix this by enabling CONFIG_DEBUG_FS explicitly.
>
> See also commit 18977008f44c66bd ("ARM: multi_v7_defconfig: Restore
> debugfs support").
>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
> Link: https://lore.kernel.org/r/20191209101327.26571-1-geert+renesas@glider.be
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
>  arch/arm/configs/shmobile_defconfig | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm/configs/shmobile_defconfig b/arch/arm/configs/shmobile_defconfig
> index c6c70355141c..7e7b678ae153 100644
> --- a/arch/arm/configs/shmobile_defconfig
> +++ b/arch/arm/configs/shmobile_defconfig
> @@ -215,4 +215,5 @@ CONFIG_DMA_CMA=y
>  CONFIG_CMA_SIZE_MBYTES=64
>  CONFIG_PRINTK_TIME=y
>  # CONFIG_ENABLE_MUST_CHECK is not set
> +CONFIG_DEBUG_FS=y
>  CONFIG_DEBUG_KERNEL=y

Gr{oetje,eeting}s,

                        Geert

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