DRM: urgent v4.9-rc6 build regression: master build: 2 failures 1 warnings (v4.9-rc5-213-g961b708)

[Arnd Bergmann]

On Thursday, November 17, 2016 4:14:44 AM CET Build bot for Mark Brown wrote:
>         arm64-allmodconfig
> ../drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c:126:36: error: 'OD_CFG' undeclared (first use in this function)
> ../drivers/gpu/drm/mediatek/mtk_drm_drv.c:220:5: error: 'struct drm_device' has no member named 'vblank_disable_allowed'
> 
>         arm-allmodconfig
> ../drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c:126:36: error: 'OD_CFG' undeclared (first use in this function)
> ../drivers/gpu/drm/mediatek/mtk_drm_drv.c:220:5: error: 'struct drm_device' has no member named 'vblank_disable_allowed'

These two patches need to be reverted or fixed:

f752fff ("drm/mediatek: set vblank_disable_allowed to true")
83ba62b ("drm/mediatek: fix a typo of OD_CFG to OD_RELAYMODE")

Both of them seem to work fine on linux-next, but were accidentally sent
to Linus yesterday through:

    Merge tag 'drm-fixes-for-v4.9-rc6' of git://people.freedesktop.org/~airlied/linux
    Merge branch 'mediatek-drm-fixes-2016-11-11' of https://github.com/ckhu-mediatek/linux.git-tags into drm-fixes

Clearly that branch has never been build-tested by itself. Unfortunately
the dependency on "HAVE_ARM_SMCCC" caused the driver to not be no longer
included in x86 allmodconfig builds despite the COMPILE_TEST check,
so neither David Airlie nor Linus Torvalds caught it before it got merged.

	Arnd