linux-kernel - Re: [PATCH] firmware: fw_cfg register offsets on supported architectures only

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Date:	Tue, 23 Feb 2016 07:08:07 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Gabriel Somlo <somlo@....edu>
Cc:	gregkh@...uxfoundation.org, robh+dt@...nel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, arnd@...db.de, lersek@...hat.com,
	ralf@...ux-mips.org, rmk+kernel@....linux.org.uk, eric@...olt.net,
	hanjun.guo@...aro.org, zajec5@...il.com, sudeep.holla@....com,
	agross@...eaurora.org, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	qemu-devel@...gnu.org, imammedo@...hat.com,
	peter.maydell@...aro.org, leif.lindholm@...aro.org,
	ard.biesheuvel@...aro.org, pbonzini@...hat.com, kraxel@...hat.com,
	ehabkost@...hat.com, luto@...capital.net, stefanha@...il.com,
	revol@...e.fr, matt@...eblueprint.co.uk, rth@...ddle.net
Subject: Re: [PATCH] firmware: fw_cfg register offsets on supported
 architectures only

On Mon, Feb 22, 2016 at 04:18:18PM -0500, Gabriel Somlo wrote:
> Refrain from defining default fw_cfg register offsets on
> unsupported architectures -- throw an error instead. If
> QEMU were to add fw_cfg support on additional architectures,
> we should add them to the FW_CFG_SYSFS depends statement in
> drivers/firmware/Kconfig, and provide default values for
> register offsets in drivers/firmware/qemu_fw_cfg.c at that
> time.
> 
> Suggested-by: Michael S. Tsirkin <mst@...hat.com>
> Signed-off-by: Gabriel Somlo <somlo@....edu>

Acked-by: Michael S. Tsirkin <mst@...hat.com>


> ---
>  drivers/firmware/qemu_fw_cfg.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/firmware/qemu_fw_cfg.c b/drivers/firmware/qemu_fw_cfg.c
> index fedbff5..79f6b7b 100644
> --- a/drivers/firmware/qemu_fw_cfg.c
> +++ b/drivers/firmware/qemu_fw_cfg.c
> @@ -109,9 +109,7 @@ static void fw_cfg_io_cleanup(void)
>  #  define FW_CFG_CTRL_OFF 0x00
>  #  define FW_CFG_DATA_OFF 0x01
>  # else
> -#  warning "QEMU FW_CFG may not be available on this architecture!"
> -#  define FW_CFG_CTRL_OFF 0x00
> -#  define FW_CFG_DATA_OFF 0x01
> +#  error "QEMU FW_CFG not available on this architecture!"
>  # endif
>  #endif
>  
> -- 
> 2.4.3