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@xxxxxxxxxx> wrote:
>
> From: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
>
> [ 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@xxxxxxxxx>
> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
> Link: https://lore.kernel.org/r/20191209101327.26571-1-geert+renesas@xxxxxxxxx
> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
> ---
> 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@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
