[PATCH v4 2/2] drm/xen-front: Add support for Xen PV display frontend

[kbuild test robot]

Hi Oleksandr,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on drm/drm-next]
[also build test WARNING on next-20180328]
[cannot apply to v4.16-rc7]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Oleksandr-Andrushchenko/drm-xen-front-Add-support-for-Xen-PV-display-frontend/20180329-090744
base:   git://people.freedesktop.org/~airlied/linux.git drm-next
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> drivers/gpu/drm/xen/xen_drm_front_kms.c:276:22: sparse: symbol 'display_mode_valid' was not declared. Should it be static?

Please review and possibly fold the followup patch.

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation