[PATCH v3 2/2] drm/vmwgfx: Fix prime with external buffers

[kernel test robot]

Hi Zack,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm/drm-next]
[also build test ERROR on drm-intel/for-linux-next-fixes drm-misc/drm-misc-next drm-tip/drm-tip linus/master v6.11-rc3 next-20240816]
[cannot apply to drm-exynos/exynos-drm-next drm-intel/for-linux-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Zack-Rusin/drm-vmwgfx-Fix-prime-with-external-buffers/20240815-234842
base:   git://anongit.freedesktop.org/drm/drm drm-next
patch link:    https://lore.kernel.org/r/20240815153404.630214-2-zack.rusin%40broadcom.com
patch subject: [PATCH v3 2/2] drm/vmwgfx: Fix prime with external buffers
config: i386-allmodconfig (https://download.01.org/0day-ci/archive/20240816/202408162343.umOPAMF9-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240816/202408162343.umOPAMF9-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202408162343.umOPAMF9-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/gpu/drm/vmwgfx/vmwgfx_blit.c: In function 'vmw_external_bo_copy':
>> drivers/gpu/drm/vmwgfx/vmwgfx_blit.c:503:25: error: implicit declaration of function 'floor' [-Werror=implicit-function-declaration]
     503 |         diff->rect.y1 = floor(dst_offset / dst_stride);
         |                         ^~~~~
   cc1: some warnings being treated as errors


vim +/floor +503 drivers/gpu/drm/vmwgfx/vmwgfx_blit.c

   455	
   456	static int vmw_external_bo_copy(struct vmw_bo *dst, u32 dst_offset,
   457					u32 dst_stride, struct vmw_bo *src,
   458					u32 src_offset, u32 src_stride,
   459					u32 width_in_bytes, u32 height,
   460					struct vmw_diff_cpy *diff)
   461	{
   462		struct vmw_private *vmw =
   463			container_of(dst->tbo.bdev, struct vmw_private, bdev);
   464		size_t dst_size = dst->tbo.resource->size;
   465		size_t src_size = src->tbo.resource->size;
   466		struct iosys_map dst_map = {0};
   467		struct iosys_map src_map = {0};
   468		int ret, i;
   469		u8 *vsrc;
   470		u8 *vdst;
   471	
   472		vsrc = map_external(src, &src_map);
   473		if (!vsrc) {
   474			drm_dbg_driver(&vmw->drm, "Wasn't able to map src\n");
   475			ret = -ENOMEM;
   476			goto out;
   477		}
   478	
   479		vdst = map_external(dst, &dst_map);
   480		if (!vdst) {
   481			drm_dbg_driver(&vmw->drm, "Wasn't able to map dst\n");
   482			ret = -ENOMEM;
   483			goto out;
   484		}
   485	
   486		vsrc += src_offset;
   487		vdst += dst_offset;
   488		if (src_stride == dst_stride) {
   489			dst_size -= dst_offset;
   490			src_size -= src_offset;
   491			memcpy(vdst, vsrc,
   492			       min(dst_stride * height, min(dst_size, src_size)));
   493		} else {
   494			WARN_ON(dst_stride < width_in_bytes);
   495			for (i = 0; i < height; ++i) {
   496				memcpy(vdst, vsrc, width_in_bytes);
   497				vsrc += src_stride;
   498				vdst += dst_stride;
   499			}
   500		}
   501	
   502		diff->rect.x1 = (dst_offset % dst_stride) / diff->cpp;
 > 503		diff->rect.y1 = floor(dst_offset / dst_stride);
   504		diff->rect.x2 = diff->rect.x1 + width_in_bytes / diff->cpp;
   505		diff->rect.y2 = diff->rect.y1 + height;
   506	
   507		ret = 0;
   508	out:
   509		unmap_external(src, &src_map);
   510		unmap_external(dst, &dst_map);
   511	
   512		return ret;
   513	}
   514	

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