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Date:   Thu, 29 Mar 2018 15:39:36 +0800
From:   kbuild test robot <lkp@intel.com>
To:     Oleksandr Andrushchenko <andr2000@gmail.com>
Cc:     kbuild-all@01.org, xen-devel@lists.xenproject.org,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        airlied@linux.ie, daniel.vetter@intel.com, seanpaul@chromium.org,
        gustavo@padovan.org, jgross@suse.com, boris.ostrovsky@oracle.com,
        konrad.wilk@oracle.com, andr2000@gmail.com,
        Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Subject: Re: [PATCH v4 2/2] drm/xen-front: Add support for Xen PV display
 frontend
Message-ID: <201803291558.HKHwOnSd%fengguang.wu@intel.com>
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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.

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