Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Fri, 24 Sep 2021 16:10:43 +0200
From:   Johan Hovold <johan@kernel.org>
To:     Geert Uytterhoeven <geert+renesas@glider.be>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jiri Slaby <jirislaby@kernel.org>,
        Shawn Guo <shawnguo@kernel.org>, Li Yang <leoyang.li@nxp.com>,
        Scott Wood <oss@buserror.net>, linux-serial@vger.kernel.org,
        linuxppc-dev@lists.ozlabs.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 1/2] serial: 8250: SERIAL_8250_FSL should not default
 to y when compile-testing
Message-ID: <YU3cY0dlNz4iMB70@hovoldconsulting.com>
References: <6421f256407262afd658ffa74ec9430581528a7d.1632467477.git.geert+renesas@glider.be>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <6421f256407262afd658ffa74ec9430581528a7d.1632467477.git.geert+renesas@glider.be>
Precedence: bulk

On Fri, Sep 24, 2021 at 09:12:30AM +0200, Geert Uytterhoeven wrote:
> Commit b1442c55ce8977aa ("serial: 8250: extend compile-test coverage")
> added compile-test support to the Freescale 16550 driver.  However, as
> SERIAL_8250_FSL is an invisible symbol, merely enabling compile-testing
> now enables this driver.
> 
> Fix this by dropping the COMPILE_TEST default again, but making the
> SERIAL_8250_FSL symbol visible instead.
> 
> Fixes: b1442c55ce8977aa ("serial: 8250: extend compile-test coverage")
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> ---
> v2:
>   - Split in two parts.

I realised that we can do better than this. I've prepared a patch that
preserves the old behaviour of always enabling the option on platforms
that may need it while also not enabling it by default when compile
testing.

Note that SERIAL_8250_FSL only enables a workaround for an erratum in
the Freescale UARTs in the 8250 driver (leaving the later added ACPI
support aside) and we shouldn't make it easier to disable it by mistake.

> ---
>  drivers/tty/serial/8250/Kconfig | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
> index 808268edd2e82a45..0af96f3adab517f6 100644
> --- a/drivers/tty/serial/8250/Kconfig
> +++ b/drivers/tty/serial/8250/Kconfig
> @@ -361,9 +361,12 @@ config SERIAL_8250_BCM2835AUX
>  	  If unsure, say N.
>  
>  config SERIAL_8250_FSL
> -	bool
> +	bool "Freescale 16550-style UART support (8250 based driver)"
>  	depends on SERIAL_8250_CONSOLE
> -	default PPC || ARM || ARM64 || COMPILE_TEST
> +	default PPC || ARM || ARM64
> +	help
> +	  Selecting this option will add support for the 16550-style serial
> +	  port hardware found on Freescale SoCs.
>  
>  config SERIAL_8250_DW
>  	tristate "Support for Synopsys DesignWare 8250 quirks"

Johan