[drm-intel:topic/drm-misc 35/35] drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c:618:2: error: implicit declaration of function 'drm_connector_unplug_all'

[drm-intel:topic/drm-misc 35/35] drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c:618:2: error: implicit declaration of function 'drm_connector_unplug_all'

[kbuild test robot]

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tree:   git://anongit.freedesktop.org/drm-intel topic/drm-misc
head:   6c87e5c3ec6db052f3744804a517b6fb003906e1
commit: 6c87e5c3ec6db052f3744804a517b6fb003906e1 [35/35] drm: Rename drm_connector_unplug_all() to drm_connector_unregister_all()
config: arm-at91_dt_defconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 6c87e5c3ec6db052f3744804a517b6fb003906e1
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

All errors (new ones prefixed by >>):

   drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c: In function 'atmel_hlcdc_dc_connector_unplug_all':
>> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c:618:2: error: implicit declaration of function 'drm_connector_unplug_all' [-Werror=implicit-function-declaration]
     drm_connector_unplug_all(dev);
     ^
   cc1: some warnings being treated as errors

vim +/drm_connector_unplug_all +618 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c

1a396789 Boris Brezillon 2015-01-06  612  	return ret;
1a396789 Boris Brezillon 2015-01-06  613  }
1a396789 Boris Brezillon 2015-01-06  614  
1a396789 Boris Brezillon 2015-01-06  615  static void atmel_hlcdc_dc_connector_unplug_all(struct drm_device *dev)
1a396789 Boris Brezillon 2015-01-06  616  {
1a396789 Boris Brezillon 2015-01-06  617  	mutex_lock(&dev->mode_config.mutex);
1a396789 Boris Brezillon 2015-01-06 @618  	drm_connector_unplug_all(dev);
1a396789 Boris Brezillon 2015-01-06  619  	mutex_unlock(&dev->mode_config.mutex);
1a396789 Boris Brezillon 2015-01-06  620  }
1a396789 Boris Brezillon 2015-01-06  621  

:::::: The code at line 618 was first introduced by commit
:::::: 1a396789f65a22711eecddc5c13c0dec6bd753c7 drm: add Atmel HLCDC Display Controller support

:::::: TO: Boris Brezillon <boris.brezillon@free-electrons.com>
:::::: CC: Boris Brezillon <boris.brezillon@free-electrons.com>

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

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