Hi "Christian, I love your patch! Yet something to improve: [auto build test ERROR on hnaz-linux-mm/master] [also build test ERROR on drm-intel/for-linux-next drm-tip/drm-tip linus/master v5.9-rc5 next-20200914] [cannot apply to tegra-drm/drm/tegra/for-next drm-exynos/exynos-drm-next drm/drm-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] url: https://github.com/0day-ci/linux/commits/Christian-K-nig/drm-shmem-helper... base: https://github.com/hnaz/linux-mm master config: h8300-randconfig-r023-20200914 (attached as .config) compiler: h8300-linux-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=h8300 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): h8300-linux-ld: drivers/dma-buf/dma-buf.o: in function `dma_buf_mmap': h8300-linux-ld: drivers/leds/leds-lp55xx-common.o: in function `devm_led_classdev_register': include/linux/leds.h:200: undefined reference to `devm_led_classdev_register_ext' # https://github.com/0day-ci/linux/commit/c558278651bbea7cb67487890a9836087... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Christian-K-nig/drm-shmem-helpers-revert-Redirect-mmap-for-imported-dma-buf/20200914-222921 git checkout c558278651bbea7cb67487890a983608764cc7f4 vim +1166 drivers/dma-buf/dma-buf.c 1127 1128 1129 /** 1130 * dma_buf_mmap - Setup up a userspace mmap with the given vma 1131 * @dmabuf: [in] buffer that should back the vma 1132 * @vma: [in] vma for the mmap 1133 * @pgoff: [in] offset in pages where this mmap should start within the 1134 * dma-buf buffer. 1135 * 1136 * This function adjusts the passed in vma so that it points at the file of the 1137 * dma_buf operation. It also adjusts the starting pgoff and does bounds 1138 * checking on the size of the vma. Then it calls the exporters mmap function to 1139 * set up the mapping. 1140 * 1141 * Can return negative error values, returns 0 on success. 1142 */ 1143 int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma, 1144 unsigned long pgoff) 1145 { 1146 struct file *oldfile; 1147 int ret; 1148 1149 if (WARN_ON(!dmabuf || !vma)) 1150 return -EINVAL; 1151 1152 /* check if buffer supports mmap */ 1153 if (!dmabuf->ops->mmap) 1154 return -EINVAL; 1155 1156 /* check for offset overflow */ 1157 if (pgoff + vma_pages(vma) < pgoff) 1158 return -EOVERFLOW; 1159 1160 /* check for overflowing the buffer's size */ 1161 if (pgoff + vma_pages(vma) > 1162 dmabuf->size >> PAGE_SHIFT) 1163 return -EINVAL; 1164 1165 /* readjust the vma */ 1167 vma->vm_pgoff = pgoff; 1168 1169 ret = dmabuf->ops->mmap(dmabuf, vma); 1170 /* restore old parameters on failure */ 1171 if (ret) 1173 1174 return ret; 1175 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org