Hi Daniel,

I love your patch! Yet something to improve:

[auto build test ERROR on drm-intel/for-linux-next]
[also build test ERROR on drm-tip/drm-tip drm-exynos/exynos-drm-next tegra-drm/drm/tegra/for-next linus/master v5.7 next-20200612]
[cannot apply to drm/drm-next]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Daniel-Vetter/drm-atomic-helper-reset-vblank-on-crtc-reset/20200613-000414
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
config: x86_64-rhel-7.6 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
reproduce (this is a W=1 build):
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>, old ones prefixed by <<):

drivers/gpu/drm/vmwgfx/vmwgfx_kms.c: In function 'vmw_du_primary_plane_atomic_check':
drivers/gpu/drm/vmwgfx/vmwgfx_kms.c:460:31: warning: variable 'vcs' set but not used [-Wunused-but-set-variable]
460 |   struct vmw_connector_state *vcs;
|                               ^~~
drivers/gpu/drm/vmwgfx/vmwgfx_kms.c: In function 'vmw_du_crtc_reset':
<< In file included from drivers/gpu/drm/vmwgfx/vmwgfx_kms.c:37:
>> drivers/gpu/drm/vmwgfx/vmwgfx_kms.c:632:40: error: 'state' undeclared (first use in this function); did you mean 'statx'?
632 |  __drm_atomic_helper_crtc_reset(crtc, &state->base);
|                                        ^~~~~
|                                        statx
drivers/gpu/drm/vmwgfx/vmwgfx_kms.c:632:40: note: each undeclared identifier is reported only once for each function it appears in
In file included from drivers/gpu/drm/vmwgfx/vmwgfx_kms.c:37:
At top level:
drivers/gpu/drm/vmwgfx/vmwgfx_kms.h:256:23: warning: 'vmw_cursor_plane_formats' defined but not used [-Wunused-const-variable=]
256 | static const uint32_t vmw_cursor_plane_formats[] = {
|                       ^~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/vmwgfx/vmwgfx_kms.h:248:23: warning: 'vmw_primary_plane_formats' defined but not used [-Wunused-const-variable=]
248 | static const uint32_t vmw_primary_plane_formats[] = {
|                       ^~~~~~~~~~~~~~~~~~~~~~~~~

vim +632 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c

   604	
   605	
   606	/**
   607	 * vmw_du_crtc_reset - creates a blank vmw crtc state
   608	 * @crtc: DRM crtc
   609	 *
   610	 * Resets the atomic state for @crtc by freeing the state pointer (which
   611	 * might be NULL, e.g. at driver load time) and allocating a new empty state
   612	 * object.
   613	 */
   614	void vmw_du_crtc_reset(struct drm_crtc *crtc)
   615	{
   616		struct vmw_crtc_state *vcs;
   617	
   618	
   619		if (crtc->state) {
   620			__drm_atomic_helper_crtc_destroy_state(crtc->state);
   621	
   622			kfree(vmw_crtc_state_to_vcs(crtc->state));
   623		}
   624	
   625		vcs = kzalloc(sizeof(*vcs), GFP_KERNEL);
   626	
   627		if (!vcs) {
   628			DRM_ERROR("Cannot allocate vmw_crtc_state\n");
   629			return;
   630		}
   631	
 > 632		__drm_atomic_helper_crtc_reset(crtc, &state->base);
   633	}
   634	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org