linux-kernel - Re: [PATCH linux-next] drm/i915/display: Remove unused variable in the for loop.

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Date:   Mon, 18 Oct 2021 20:14:31 +0800
From:   kernel test robot <lkp@...el.com>
To:     luo penghao <cgel.zte@...il.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, luo penghao <luo.penghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH linux-next] drm/i915/display: Remove unused variable in
 the for loop.

Hi luo,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on next-20211015]

url:    https://github.com/0day-ci/linux/commits/luo-penghao/drm-i915-display-Remove-unused-variable-in-the-for-loop/20211018-164557
base:    7c832d2f9b959e3181370c8b0dacaf9efe13fc05
config: x86_64-randconfig-r014-20211018 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d245f2e8597bfb52c34810a328d42b990e4af1a4)
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/0day-ci/linux/commit/1a3c67fc7e245a1130e2b59fe5a04ce82de697c0
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review luo-penghao/drm-i915-display-Remove-unused-variable-in-the-for-loop/20211018-164557
        git checkout 1a3c67fc7e245a1130e2b59fe5a04ce82de697c0
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 

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

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/i915/display/intel_fb.c:1018:25: error: expression result unused [-Werror,-Wunused-value]
                   fb->base.format->cpp[i];
                   ~~~~~~~~~~~~~~~~~~~~ ~^
   1 error generated.


vim +1018 drivers/gpu/drm/i915/display/intel_fb.c

   977	
   978	int intel_fill_fb_info(struct drm_i915_private *i915, struct intel_framebuffer *fb)
   979	{
   980		struct drm_i915_gem_object *obj = intel_fb_obj(&fb->base);
   981		u32 gtt_offset_rotated = 0;
   982		u32 gtt_offset_remapped = 0;
   983		unsigned int max_size = 0;
   984		int i, num_planes = fb->base.format->num_planes;
   985		unsigned int tile_size = intel_tile_size(i915);
   986	
   987		intel_fb_view_init(i915, &fb->normal_view, I915_GGTT_VIEW_NORMAL);
   988	
   989		drm_WARN_ON(&i915->drm,
   990			    intel_fb_supports_90_270_rotation(fb) &&
   991			    intel_fb_needs_pot_stride_remap(fb));
   992	
   993		if (intel_fb_supports_90_270_rotation(fb))
   994			intel_fb_view_init(i915, &fb->rotated_view, I915_GGTT_VIEW_ROTATED);
   995		if (intel_fb_needs_pot_stride_remap(fb))
   996			intel_fb_view_init(i915, &fb->remapped_view, I915_GGTT_VIEW_REMAPPED);
   997	
   998		for (i = 0; i < num_planes; i++) {
   999			struct fb_plane_view_dims view_dims;
  1000			unsigned int width, height;
  1001			unsigned int size;
  1002			u32 offset;
  1003			int x, y;
  1004			int ret;
  1005	
  1006			/*
  1007			 * Plane 2 of Render Compression with Clear Color fb modifier
  1008			 * is consumed by the driver and not passed to DE. Skip the
  1009			 * arithmetic related to alignment and offset calculation.
  1010			 */
  1011			if (is_gen12_ccs_cc_plane(&fb->base, i)) {
  1012				if (IS_ALIGNED(fb->base.offsets[i], PAGE_SIZE))
  1013					continue;
  1014				else
  1015					return -EINVAL;
  1016			}
  1017	
> 1018			fb->base.format->cpp[i];
  1019			intel_fb_plane_dims(fb, i, &width, &height);
  1020	
  1021			ret = convert_plane_offset_to_xy(fb, i, width, &x, &y);
  1022			if (ret)
  1023				return ret;
  1024	
  1025			init_plane_view_dims(fb, i, width, height, &view_dims);
  1026	
  1027			/*
  1028			 * First pixel of the framebuffer from
  1029			 * the start of the normal gtt mapping.
  1030			 */
  1031			fb->normal_view.color_plane[i].x = x;
  1032			fb->normal_view.color_plane[i].y = y;
  1033			fb->normal_view.color_plane[i].stride = fb->base.pitches[i];
  1034	
  1035			offset = calc_plane_aligned_offset(fb, i, &x, &y);
  1036	
  1037			if (intel_fb_supports_90_270_rotation(fb))
  1038				gtt_offset_rotated += calc_plane_remap_info(fb, i, &view_dims,
  1039									    offset, gtt_offset_rotated, x, y,
  1040									    &fb->rotated_view);
  1041	
  1042			if (intel_fb_needs_pot_stride_remap(fb))
  1043				gtt_offset_remapped += calc_plane_remap_info(fb, i, &view_dims,
  1044									     offset, gtt_offset_remapped, x, y,
  1045									     &fb->remapped_view);
  1046	
  1047			size = calc_plane_normal_size(fb, i, &view_dims, x, y);
  1048			/* how many tiles in total needed in the bo */
  1049			max_size = max(max_size, offset + size);
  1050		}
  1051	
  1052		if (mul_u32_u32(max_size, tile_size) > obj->base.size) {
  1053			drm_dbg_kms(&i915->drm,
  1054				    "fb too big for bo (need %llu bytes, have %zu bytes)\n",
  1055				    mul_u32_u32(max_size, tile_size), obj->base.size);
  1056			return -EINVAL;
  1057		}
  1058	
  1059		return 0;
  1060	}
  1061	

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

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