linux-kernel - Re: [PATCH] firmware: qemu config needs I/O ports

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Message-ID: <20160211143404.GM16357@HEDWIG.INI.CMU.EDU>
Date:	Thu, 11 Feb 2016 09:34:04 -0500
From:	"Gabriel L. Somlo" <somlo@....edu>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] firmware: qemu config needs I/O ports

On Thu, Feb 11, 2016 at 03:23:51PM +0100, Arnd Bergmann wrote:
> Not all machines have PCI style I/O port memory, or they do not allow
> mapping it using the ioport_map() function, whcih results in a
> build error with the newly added qemu firmware code:
> 
> drivers/firmware/built-in.o: In function `fw_cfg_io_cleanup':
> qemu_fw_cfg.c:(.text+0x144): undefined reference to `ioport_unmap'
> drivers/firmware/built-in.o: In function `fw_cfg_sysfs_probe':
> qemu_fw_cfg.c:(.text+0xb18): undefined reference to `ioport_map'
> 
> This adds a Kconfig dependency to ensure the driver can only
> be built on platforms that support it.

Thanks for catching this; as it turns out, an IOPORT_MAP-less machine
wasn't among the things I tried when testing the build process on
various architectures...

Acked-by: Gabriel Somlo <somlo@....edu>

> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: 75f3e8e47f38 ("firmware: introduce sysfs driver for QEMU's fw_cfg device")
> ---
>  drivers/firmware/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
> index 5130f74ae3bd..6664f1108c7c 100644
> --- a/drivers/firmware/Kconfig
> +++ b/drivers/firmware/Kconfig
> @@ -164,6 +164,7 @@ config RASPBERRYPI_FIRMWARE
>  config FW_CFG_SYSFS
>  	tristate "QEMU fw_cfg device support in sysfs"
>  	depends on SYSFS && (ARM || ARM64 || PPC_PMAC || SPARC || X86)
> +	depends on HAS_IOPORT_MAP
>  	default n
>  	help
>  	  Say Y or M here to enable the exporting of the QEMU firmware
> -- 
> 2.7.0
>