Hi Peter,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v4.19-rc3 next-20180910]
[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/Peter-Wu/qxl-refactor-to-use-drm_fb_helper_fbdev_setup/20180911-071413
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/qxl/qxl_drv.c:144:9: sparse: undefined identifier 
'qxl_fbdev_set_suspend'
   drivers/gpu/drm/qxl/qxl_drv.c:181:9: sparse: undefined identifier 
'qxl_fbdev_set_suspend'
>> drivers/gpu/drm/qxl/qxl_drv.c:144:30: sparse: call with no type!
   drivers/gpu/drm/qxl/qxl_drv.c:181:30: sparse: call with no type!
   drivers/gpu/drm/qxl/qxl_drv.c: In function 'qxl_drm_freeze':
   drivers/gpu/drm/qxl/qxl_drv.c:144:2: error: implicit declaration of function 
'qxl_fbdev_set_suspend'; did you mean 'fb_set_suspend'? 
[-Werror=implicit-function-declaration]
     qxl_fbdev_set_suspend(qdev, 1);
     ^~~~~~~~~~~~~~~~~~~~~
     fb_set_suspend
   cc1: some warnings being treated as errors
--
>> drivers/gpu/drm/qxl/qxl_fb.c:166:21: sparse: incorrect type in assignment 
>> (different address spaces) @@    expected char const *data @@    got char 
>> [noderchar const *data @@
   drivers/gpu/drm/qxl/qxl_fb.c:166:21:    expected char const *data
   drivers/gpu/drm/qxl/qxl_fb.c:166:21:    got char [noderef] <asn:2>*
   include/linux/overflow.h:251:13: sparse: undefined identifier 
'__builtin_mul_overflow'
   include/linux/overflow.h:251:13: sparse: incorrect type in conditional
   include/linux/overflow.h:251:13:    got void
   include/linux/overflow.h:251:13: sparse: call with no type!

vim +166 drivers/gpu/drm/qxl/qxl_fb.c

   130  
   131  /*
   132   * FIXME
   133   * It should not be necessary to have a special dirty() callback for 
fbdev.
   134   */
   135  static int qxlfb_framebuffer_dirty(struct drm_framebuffer *fb,
   136                                     struct drm_file *file_priv,
   137                                     unsigned flags, unsigned color,
   138                                     struct drm_clip_rect *clips,
   139                                     unsigned num_clips)
   140  {
   141          struct qxl_device *qdev = fb->dev->dev_private;
   142          struct fb_info *info = qdev->fb_helper.fbdev;
   143          struct qxl_fb_image qxl_fb_image;
   144          struct fb_image *image = &qxl_fb_image.fb_image;
   145  
   146          /* TODO: hard coding 32 bpp */
   147          int stride = fb->pitches[0];
   148  
   149          /*
   150           * we are using a shadow draw buffer, at qdev->surface0_shadow
   151           */
   152          image->dx = clips->x1;
   153          image->dy = clips->y1;
   154          image->width = clips->x2 - clips->x1;
   155          image->height = clips->y2 - clips->y1;
   156          image->fg_color = 0xffffffff; /* unused, just to avoid 
uninitialized
   157                                           warnings */
   158          image->bg_color = 0;
   159          image->depth = 32;           /* TODO: take from somewhere? */
   160          image->cmap.start = 0;
   161          image->cmap.len = 0;
   162          image->cmap.red = NULL;
   163          image->cmap.green = NULL;
   164          image->cmap.blue = NULL;
   165          image->cmap.transp = NULL;
 > 166          image->data = info->screen_base + (clips->x1 * 4) + (stride * 
 > clips->y1);
   167  
   168          qxl_fb_image_init(&qxl_fb_image, qdev, info, NULL);
   169          qxl_draw_opaque_fb(&qxl_fb_image, stride);
   170  
   171          return 0;
   172  }
   173  

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