Re: [PATCH RFC 3/3] drm/i915/display: Implement fb_mmap callback function

[kernel test robot <lkp@intel.com>]

Hi Nirmoy,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on drm-tip/drm-tip]

url:    https://github.com/intel-lab-lkp/linux/commits/Nirmoy-Das/drm-i915-Add-a-helper-func-for-gem-obj-mmap/20230306-183112
base:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
patch link:    https://lore.kernel.org/r/20230306102850.18299-3-nirmoy.das%40intel.com
patch subject: [PATCH RFC 3/3] drm/i915/display: Implement fb_mmap callback function
config: i386-randconfig-a012-20230306 (https://download.01.org/0day-ci/archive/20230307/202303070027.DvK3SmXg-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/2c504ed19ce4930ccadb2e9060cc79056969c599
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Nirmoy-Das/drm-i915-Add-a-helper-func-for-gem-obj-mmap/20230306-183112
        git checkout 2c504ed19ce4930ccadb2e9060cc79056969c599
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/gpu/drm/i915/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303070027.DvK3SmXg-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/i915/display/intel_fbdev.c:131:21: warning: unused variable 'dev' [-Wunused-variable]
           struct drm_device *dev = fbdev->helper.dev;
                              ^
   1 warning generated.


vim +/dev +131 drivers/gpu/drm/i915/display/intel_fbdev.c

   124	
   125	#define to_intel_fbdev(x) container_of(x, struct intel_fbdev, helper)
   126	static int intel_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
   127	{
   128		struct intel_fbdev *fbdev = to_intel_fbdev(info->par);
   129		struct drm_gem_object *bo = drm_gem_fb_get_obj(&fbdev->fb->base, 0);
   130		struct drm_i915_gem_object *obj = to_intel_bo(bo);
 > 131		struct drm_device *dev = fbdev->helper.dev;
   132	
   133		vma->vm_page_prot =
   134				pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
   135	
   136		if (obj->stolen)
   137			return vm_iomap_memory(vma, info->fix.smem_start,
   138					       info->fix.smem_len);
   139	
   140		return i915_gem_object_mmap(obj, vma);
   141	}
   142	static const struct fb_ops intelfb_ops = {
   143		.owner = THIS_MODULE,
   144		DRM_FB_HELPER_DEFAULT_OPS,
   145		.fb_set_par = intel_fbdev_set_par,
   146		.fb_read = drm_fb_helper_cfb_read,
   147		.fb_write = drm_fb_helper_cfb_write,
   148		.fb_fillrect = drm_fb_helper_cfb_fillrect,
   149		.fb_copyarea = drm_fb_helper_cfb_copyarea,
   150		.fb_imageblit = drm_fb_helper_cfb_imageblit,
   151		.fb_pan_display = intel_fbdev_pan_display,
   152		.fb_blank = intel_fbdev_blank,
   153		.fb_mmap = intel_fbdev_mmap,
   154	};
   155	

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