linux-kernel - [char-misc:char-misc-testing] warning

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Message-ID: <20161101150702.00a6379f@erd979>
Date:   Tue, 1 Nov 2016 15:07:02 +0100
From:   Robin van der Gracht <robin@...tonic.nl>
To:     Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>
Cc:     Sean Paul <seanpaul@...omium.org>,
        Greg Kroah-Hartman <gregkh@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: [char-misc:char-misc-testing] warning

Hi Tobias,

Lately I've submitted patches to Gregs (char-misc) git repo and they got
bounced because the kbuild bot threw a warning:

warning: (PMAC_BACKLIGHT && DRM_NOUVEAU && HT16K33 && FB_TFT) selects
FB_BACKLIGHT which has unmet direct dependencies (HAS_IOMEM && FB)

My patched added a new driver named HT16K33, but..

I believe the warning is the result of a dependency issue made possible by this commit:
https://kernel.googlesource.com/pub/scm/linux/kernel/git/gregkh/char-misc/+/fc497ed8361f34e465f31e9babcb88efe38fe433

The kbuild bots configuration file stated:
CONFIG_HAS_IOMEM=y
CONFIG_DRM_NOUVEAU=y
CONFIG_DRM_NOUVEAU_BACKLIGHT=y
CONFIG_FB_BACKLIGHT=y
# CONFIG_FB is not set

PMAC_BACKLIGHT, HT16K33 and FB_TFT ware not mentioned in the config file.
I've attached the config file to this email.

FB_BACKLIGHT depends on FB like so:

(drivers/video/fbdev/Kconfig)
config FB_BACKLIGHT
	bool
	depends on FB
	...

In your commit the 'select FB' is removed from the config DRM_NOUVEAU in
the drivers/gpu/drm/nouveau/Kconfig file but DRM_NOUVEAU still selects
FB_BACKLIGHT when using DRM_NOUVEAU_BACKLIGHT.

Is no one else selects FB, the warning mentioned above is raised.

Would you like to verify this?

Regards,

-- 
Robin van der Gracht
Protonic Holland

Download attachment "config.gz" of type "application/gzip" (26724 bytes)