Hi Thomas,

I love your patch! Yet something to improve:

[auto build test ERROR on next-20200305]
[cannot apply to rockchip/for-next shawnguo/for-next sunxi/sunxi/for-next 
tegra/for-next linus/master v5.6-rc4 v5.6-rc3 v5.6-rc2 v5.6-rc4]
[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/Thomas-Zimmermann/drm-Convert-drivers-to-drm_simple_encoder_init/20200306-045931
base:    47466dcf84ee66a973ea7d2fca7e582fe9328932
config: i386-randconfig-h002-20200307 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-5) 7.5.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <l...@intel.com>

All errors (new ones prefixed by >>):

   drivers/gpu/drm/virtio/virtgpu_display.c: In function 'vgdev_output_init':
>> drivers/gpu/drm/virtio/virtgpu_display.c:276:2: error: implicit declaration 
>> of function 'drm_simple_encoder_init'; did you mean 'drm_encoder_init'? 
>> [-Werror=implicit-function-declaration]
     drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_VIRTUAL);
     ^~~~~~~~~~~~~~~~~~~~~~~
     drm_encoder_init
   Cyclomatic Complexity 1 arch/x86/include/asm/bitops.h:fls
   Cyclomatic Complexity 1 include/linux/log2.h:__ilog2_u32
   Cyclomatic Complexity 1 include/linux/err.h:ERR_PTR
   Cyclomatic Complexity 1 include/linux/err.h:PTR_ERR
   Cyclomatic Complexity 3 include/linux/slab.h:kmalloc_type
   Cyclomatic Complexity 28 include/linux/slab.h:kmalloc_index
   Cyclomatic Complexity 1 include/linux/slab.h:kmalloc_large
   Cyclomatic Complexity 4 include/linux/slab.h:kmalloc
   Cyclomatic Complexity 1 include/linux/slab.h:kzalloc
   Cyclomatic Complexity 1 
include/drm/drm_modeset_helper_vtables.h:drm_crtc_helper_add
   Cyclomatic Complexity 1 
include/drm/drm_modeset_helper_vtables.h:drm_encoder_helper_add
   Cyclomatic Complexity 1 
include/drm/drm_modeset_helper_vtables.h:drm_connector_helper_add
   Cyclomatic Complexity 1 
drivers/gpu/drm/virtio/virtgpu_display.c:virtio_gpu_crtc_atomic_enable
   Cyclomatic Complexity 1 
drivers/gpu/drm/virtio/virtgpu_display.c:virtio_gpu_crtc_atomic_check
   Cyclomatic Complexity 1 
drivers/gpu/drm/virtio/virtgpu_display.c:virtio_gpu_crtc_atomic_flush
   Cyclomatic Complexity 1 
drivers/gpu/drm/virtio/virtgpu_display.c:virtio_gpu_enc_mode_set
   Cyclomatic Complexity 1 
drivers/gpu/drm/virtio/virtgpu_display.c:virtio_gpu_enc_enable
   Cyclomatic Complexity 1 
drivers/gpu/drm/virtio/virtgpu_display.c:virtio_gpu_enc_disable
   Cyclomatic Complexity 2 
drivers/gpu/drm/virtio/virtgpu_display.c:virtio_gpu_conn_detect
   Cyclomatic Complexity 1 
drivers/gpu/drm/virtio/virtgpu_display.c:vgdev_atomic_commit_tail
   Cyclomatic Complexity 67 include/asm-generic/getorder.h:get_order
   Cyclomatic Complexity 1 include/linux/err.h:IS_ERR
   Cyclomatic Complexity 2 
drivers/gpu/drm/virtio/virtgpu_display.c:virtio_gpu_framebuffer_init
   Cyclomatic Complexity 5 
drivers/gpu/drm/virtio/virtgpu_display.c:virtio_gpu_user_framebuffer_create
   Cyclomatic Complexity 5 
drivers/gpu/drm/virtio/virtgpu_display.c:vgdev_output_init
   Cyclomatic Complexity 8 
drivers/gpu/drm/virtio/virtgpu_display.c:virtio_gpu_conn_mode_valid
   Cyclomatic Complexity 4 
drivers/gpu/drm/virtio/virtgpu_display.c:virtio_gpu_conn_get_modes
   Cyclomatic Complexity 1 
drivers/gpu/drm/virtio/virtgpu_display.c:virtio_gpu_conn_destroy
   Cyclomatic Complexity 1 
drivers/gpu/drm/virtio/virtgpu_display.c:virtio_gpu_crtc_atomic_disable
   Cyclomatic Complexity 1 
drivers/gpu/drm/virtio/virtgpu_display.c:virtio_gpu_crtc_mode_set_nofb
   Cyclomatic Complexity 2 
drivers/gpu/drm/virtio/virtgpu_display.c:virtio_gpu_modeset_init
   Cyclomatic Complexity 2 
drivers/gpu/drm/virtio/virtgpu_display.c:virtio_gpu_modeset_fini
   Cyclomatic Complexity 1 
drivers/gpu/drm/virtio/virtgpu_display.c:_GLOBAL__sub_I_00100_0_virtio_gpu_modeset_init
   Cyclomatic Complexity 1 
drivers/gpu/drm/virtio/virtgpu_display.c:_GLOBAL__sub_D_00100_1_virtio_gpu_modeset_init
   cc1: some warnings being treated as errors

vim +276 drivers/gpu/drm/virtio/virtgpu_display.c

   243  
   244  static int vgdev_output_init(struct virtio_gpu_device *vgdev, int index)
   245  {
   246          struct drm_device *dev = vgdev->ddev;
   247          struct virtio_gpu_output *output = vgdev->outputs + index;
   248          struct drm_connector *connector = &output->conn;
   249          struct drm_encoder *encoder = &output->enc;
   250          struct drm_crtc *crtc = &output->crtc;
   251          struct drm_plane *primary, *cursor;
   252  
   253          output->index = index;
   254          if (index == 0) {
   255                  output->info.enabled = cpu_to_le32(true);
   256                  output->info.r.width = cpu_to_le32(XRES_DEF);
   257                  output->info.r.height = cpu_to_le32(YRES_DEF);
   258          }
   259  
   260          primary = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_PRIMARY, 
index);
   261          if (IS_ERR(primary))
   262                  return PTR_ERR(primary);
   263          cursor = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_CURSOR, 
index);
   264          if (IS_ERR(cursor))
   265                  return PTR_ERR(cursor);
   266          drm_crtc_init_with_planes(dev, crtc, primary, cursor,
   267                                    &virtio_gpu_crtc_funcs, NULL);
   268          drm_crtc_helper_add(crtc, &virtio_gpu_crtc_helper_funcs);
   269  
   270          drm_connector_init(dev, connector, &virtio_gpu_connector_funcs,
   271                             DRM_MODE_CONNECTOR_VIRTUAL);
   272          drm_connector_helper_add(connector, 
&virtio_gpu_conn_helper_funcs);
   273          if (vgdev->has_edid)
   274                  drm_connector_attach_edid_property(connector);
   275  
 > 276          drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_VIRTUAL);
   277          drm_encoder_helper_add(encoder, &virtio_gpu_enc_helper_funcs);
   278          encoder->possible_crtcs = 1 << index;
   279  
   280          drm_connector_attach_encoder(connector, encoder);
   281          drm_connector_register(connector);
   282          return 0;
   283  }
   284  

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

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