linux-kernel - Re: [PATCH] USB: Build usb_speed

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Date:	Mon, 20 Aug 2012 15:47:48 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Andi Kleen <andi@...stfloor.org>
cc:	linux-usb@...r.kernel.org, <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>, <greg@...ah.com>
Subject: Re: [PATCH] USB: Build usb_speed_string unconditionally

On Mon, 20 Aug 2012, Andi Kleen wrote:

> From: Andi Kleen <ak@...ux.intel.com>
> 
> The usb core uses usb_speed_string(). But it's only selected
> for USB_GADGET. Enable it unconditionally.

What are you talking about?  USB_COMMON isn't selected at all, but it
does get built whenever USB or USB_GAGDET is enabled.  From
drivers/usb/Kconfig:

config USB_COMMON
	tristate
	default y
	depends on USB || USB_GADGET

One could argue that USB_COMMON should never be set to M, that it
should be Y if either USB or USB_GADGET is enabled at all.  But that's 
a separate matter.

> Fixes a lot of randconfig builds.

How?

Alan Stern

> Cc: greg@...ah.com
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  drivers/usb/Makefile |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
> index f5ed3d7..d74535b 100644
> --- a/drivers/usb/Makefile
> +++ b/drivers/usb/Makefile
> @@ -57,4 +57,4 @@ obj-$(CONFIG_USB_CHIPIDEA)	+= chipidea/
>  obj-$(CONFIG_USB_RENESAS_USBHS)	+= renesas_usbhs/
>  obj-$(CONFIG_USB_GADGET)	+= gadget/
>  
> -obj-$(CONFIG_USB_COMMON)	+= usb-common.o
> +obj-y				+= usb-common.o

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