linux-kernel - Re: [PATCH -next] media/usb: fix kconfig dependencies (aka bool depending on tristate considered harmful)

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Date:	Wed, 8 May 2013 23:18:19 +0200
From:	"Yann E. MORIN" <yann.morin.1998@...e.fr>
To:	Randy Dunlap <rdunlap@...radead.org>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-media <linux-media@...r.kernel.org>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH -next] media/usb: fix kconfig dependencies (aka bool
 depending on tristate considered harmful)

Randy, All,

On Wed, May 08, 2013 at 11:26:33AM -0700, Randy Dunlap wrote:
> (a.k.a. Kconfig bool depending on a tristate considered harmful)

Maybe that would warrant a bit of explanations in:
    Documentation/kbuild/kconfig-language.txt

> Fix various build errors when CONFIG_USB=m and media USB drivers
> are builtin.  In this case, CONFIG_USB_ZR364XX=y,
> CONFIG_VIDEO_PVRUSB2=y, and CONFIG_VIDEO_STK1160=y.
> 
> This is caused by (from drivers/media/usb/Kconfig):
> 
> menuconfig MEDIA_USB_SUPPORT
> 	bool "Media USB Adapters"
> 	depends on USB && MEDIA_SUPPORT
> 	           =m     =y
> so MEDIA_USB_SUPPORT=y and all following Kconfig 'source' lines
> are included.  By adding an "if USB" guard around the 'source' lines,
> the needed dependencies are enforced.
[--SNIP--]
> 
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> ---
>  drivers/media/usb/Kconfig |    2 ++
>  1 file changed, 2 insertions(+)
> 
> --- linux-next-20130508.orig/drivers/media/usb/Kconfig
> +++ linux-next-20130508/drivers/media/usb/Kconfig
> @@ -5,6 +5,7 @@ menuconfig MEDIA_USB_SUPPORT
>  	  Enable media drivers for USB bus.
>  	  If you have such devices, say Y.
>  
> +if USB
>  if MEDIA_USB_SUPPORT

Why not starting the 'if USB' block just above MEDIA_USB_SUPPORT, and
removing the 'depends on USB' from MEDIA_USB_SUPPORT :

---8<--- 
if USB
menuconfig MEDIA_USB_SUPPORT
    bool "Media USB Adapters"
    depends on MEDIA_SUPPORT

if MEDIA_USB_SUPPORT
---8<--- 

And keeping this hunk as-is:
> @@ -52,3 +53,4 @@ source "drivers/media/usb/em28xx/Kconfig
>  endif
>  
>  endif #MEDIA_USB_SUPPORT
> +endif #USB

Regards,
Yann E. MORIN.

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