[Intel-gfx] [PATCH v4] drm/i915: Pin the ifbdev for the info->system_base GGTT mmapping

[kbuild test robot]

Hi Chris,

[auto build test WARNING on drm-intel/for-linux-next]
[cannot apply to v4.4-rc1 next-20151120]

url:    https://github.com/0day-ci/linux/commits/Chris-Wilson/drm-i915-Pin-the-ifbdev-for-the-info-system_base-GGTT-mmapping/20151121-003300
base:   git://anongit.freedesktop.org/drm-intel for-linux-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/i915/intel_fbdev.c:225:58: sparse: incorrect type in argument 2 (different base types)
   drivers/gpu/drm/i915/intel_fbdev.c:225:58:    expected struct drm_framebuffer *fb
   drivers/gpu/drm/i915/intel_fbdev.c:225:58:    got struct drm_framebuffer base
   drivers/gpu/drm/i915/intel_fbdev.c: In function 'intelfb_create':
   drivers/gpu/drm/i915/intel_fbdev.c:225:41: error: incompatible type for argument 2 of 'intel_pin_and_fence_fb_obj'
     ret = intel_pin_and_fence_fb_obj(NULL, ifbdev->fb->base, NULL);
                                            ^
   In file included from drivers/gpu/drm/i915/intel_fbdev.c:44:0:
   drivers/gpu/drm/i915/intel_drv.h:1098:5: note: expected 'struct drm_framebuffer *' but argument is of type 'struct drm_framebuffer'
    int intel_pin_and_fence_fb_obj(struct drm_plane *plane,
        ^

vim +225 drivers/gpu/drm/i915/intel_fbdev.c

   209		} else {
   210			DRM_DEBUG_KMS("re-using BIOS fb\n");
   211			prealloc = true;
   212			sizes->fb_width = intel_fb->base.width;
   213			sizes->fb_height = intel_fb->base.height;
   214		}
   215	
   216		obj = intel_fb->obj;
   217		size = obj->base.size;
   218	
   219		mutex_lock(&dev->struct_mutex);
   220	
   221		/* Pin the GGTT vma for our access via info->screen_base.
   222		 * This also validates that any existing fb inherited from the
   223		 * BIOS is suitable for own access.
   224		 */
 > 225		ret = intel_pin_and_fence_fb_obj(NULL, ifbdev->fb->base, NULL);
   226		if (ret)
   227			goto out_unlock;
   228	
   229		info = drm_fb_helper_alloc_fbi(helper);
   230		if (IS_ERR(info)) {
   231			DRM_ERROR("Failed to allocate fb_info\n");
   232			ret = PTR_ERR(info);
   233			goto out_unpin;

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