linux-kernel - Re: [PATCH] char: lack of bool string made CONFIG

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Message-ID: <CAMuHMdWr2JHwUP-WCCZ85gFCDNG_=w7XzKYzywtumvE4ihgfrg@mail.gmail.com>
Date:   Wed, 14 Dec 2016 09:58:53 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Max <jbires@...gle.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg KH <gregkh@...uxfoundation.org>,
        Josh Triplett <josh@...htriplett.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] char: lack of bool string made CONFIG_DEVPORT always on

On Wed, Dec 14, 2016 at 2:18 AM, Max <jbires@...gle.com> wrote:
> Without a bool string present, using "# CONFIG_DEVPORT is not set" in
> defconfig files would not actually unset devport. This ensured that
> /dev/port was always on, but there are reasons a user may wish to disable
> it (smaller kernel, attack surface reduction) if it's not being used. Adding
> a message here in order to make this user visible.
>
> Signed-off-by: Max Bires <jbires@...gle.com>
> ---
>  drivers/char/Kconfig | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
> index 7ad3127..e8fc493 100644
>
> --- a/drivers/char/Kconfig
> +++ b/drivers/char/Kconfig
> @@ -589,10 +589,13 @@ config TELCLOCK
>           controlling the behavior of this hardware.
>
>  config DEVPORT
> -       bool
> +       bool "/dev/port character device"

bool "/dev/port character device" if EXPERT?

>         depends on !M68K
>         depends on ISA || PCI
>         default y
> +       help
> +         Say Y here if you want to support the /dev/port device. The
> +         /dev/port device is similar to /dev/mem, but for I/O ports.

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