Re: [PATCH] xen kconfig: clarify INPUT_XEN_KBDDEV_FRONTEND select

From: Andrew Jones
Date: Fri Feb 12 2016 - 08:56:54 EST


On Fri, Feb 12, 2016 at 01:04:40PM +0100, Arnd Bergmann wrote:
> The Xen framebuffer driver selects the xen keyboard driver, so the latter
> will be built-in if XEN_FBDEV_FRONTEND=y. However, when CONFIG_INPUT
> is a loadable module, this configuration cannot work. On mainline kernels,
> the symbol will be enabled but not used, while in combination with
> a patch I have to detect such useless configurations, we get the
> expected link failure:
>
> drivers/input/built-in.o: In function `xenkbd_remove':
> xen-kbdfront.c:(.text+0x2f0): undefined reference to `input_unregister_device'
> xen-kbdfront.c:(.text+0x30e): undefined reference to `input_unregister_device'
>
> This changes the dependencies of XEN_FBDEV_FRONTEND so it cannot be
> built-in if CONFIG_INPUT=m && CONFIG_INPUT_MISC=y, as that would result
> in the broken select.
>
> As usual, we would be much better off without the 'select', but removing
> it now would likely break existing user configurations that depend on
> it, so this adds another hack on top to get it working.
>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> Fixes: 36c1132e34bd ("xen kconfig: fix select INPUT_XEN_KBDDEV_FRONTEND")
> ---
> drivers/video/fbdev/Kconfig | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
> index 8ea45a5cd806..fd3d6fd290a9 100644
> --- a/drivers/video/fbdev/Kconfig
> +++ b/drivers/video/fbdev/Kconfig
> @@ -2241,6 +2241,7 @@ config FB_VIRTUAL
> config XEN_FBDEV_FRONTEND
> tristate "Xen virtual frame buffer support"
> depends on FB && XEN
> + depends on INPUT || !INPUT_MISC
> select FB_SYS_FILLRECT
> select FB_SYS_COPYAREA
> select FB_SYS_IMAGEBLIT
> --
> 2.7.0
>

Reviewed-by: Andrew Jones <drjones@xxxxxxxxxx>

Thanks,
drew