linux-kernel - Re: [PATCH -block] fault-inject: fix build error when FAULT_INJECTION_CONFIGFS=y and CONFIGFS

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Date:   Sun, 16 Apr 2023 11:53:18 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Akinobu Mita <akinobu.mita@...il.com>
Cc:     lkp@...el.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, axboe@...nel.dk,
        oe-kbuild-all@...ts.linux.dev, shinichiro.kawasaki@....com,
        chaitanyak@...dia.com, akpm@...ux-foundation.org,
        hch@...radead.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH -block] fault-inject: fix build error when
 FAULT_INJECTION_CONFIGFS=y and CONFIGFS_FS=m

Hi Mita-san,

On Sat, Apr 15, 2023 at 3:09 PM Akinobu Mita <akinobu.mita@...il.com> wrote:
> This fixes a build error when CONFIG_FAULT_INJECTION_CONFIGFS=y and
> CONFIG_CONFIGFS_FS=m.
>
> Since the fault-injection library cannot built as a module, avoid building
> configfs as a module.
>
> Reported-by: kernel test robot <lkp@...el.com>
> Link: https://lore.kernel.org/oe-kbuild-all/202304150025.K0hczLR4-lkp@intel.com/
> Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>

Thanks for your patch!

> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -1979,7 +1979,8 @@ config FAIL_SUNRPC
>
>  config FAULT_INJECTION_CONFIGFS
>         bool "Configfs interface for fault-injection capabilities"
> -       depends on FAULT_INJECTION && CONFIGFS_FS
> +       depends on FAULT_INJECTION
> +       select CONFIGFS_FS

My first thought was "please do not select CONFIGFS_FS", but
apparently this is what most users do, so I guess it's OK.

Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>

The alternative would be to do:

-       depends on FAULT_INJECTION && CONFIGFS_FS
+       depends on FAULT_INJECTION && (CONFIGFS_FS=y ||
CONFIGFS_FS=FAULT_INJECTION)

>         help
>           This option allows configfs-based drivers to dynamically configure
>           fault-injection via configfs.  Each parameter for driver-specific

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