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

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Message-ID: <20170103135219.GA25120@kroah.com>
Date:   Tue, 3 Jan 2017 14:52:20 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Max Bires <jbires@...gle.com>
Cc:     arnd@...db.de, josh@...htriplett.org, linux-kernel@...r.kernel.org,
        geert@...ux-m68k.org
Subject: Re: [PATCH] char: lack of bool string made CONFIG_DEVPORT always on

On Tue, Jan 03, 2017 at 04:53:13AM -0800, Max Bires 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>
> Acked-by: Arnd Bergmann <arnd@...db.de>
> ---
>  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"
>  	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.
>  
>  config DCC_TTY
>  	tristate "DCC tty driver"

This does not apply at all to 4.10-rc2, what did you make it against?
Please redo it so that I can actually apply it...

thanks,

greg k-h