[kbuild-all] Re: [PATCH] drm-buf: Add debug option

Hi Daniel, I love your patch! Perhaps something to improve: [auto build test WARNING on next-20210115] [also build test WARNING on v5.11-rc3] [cannot apply to tegra-drm/drm/tegra/for-next linus/master v5.11-rc3 v5.11-rc2 v5.11-rc1] [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/Daniel-Vetter/drm-buf-Add-debug-... base: b3a3cbdec55b090d22a09f75efb7c7d34cb97f25 config: i386-randconfig-a012-20210115 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/a0f2603f574f0a1aedd7719cbb47b8077... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Daniel-Vetter/drm-buf-Add-debug-option/20210115-210650 git checkout a0f2603f574f0a1aedd7719cbb47b807796d2367 # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/dma-buf/dma-buf.c: In function '__map_dma_buf': 676 | #if CONFIG_DMABUF_DEBUG | ^~~~~~~~~~~~~~~~~~~ drivers/dma-buf/dma-buf.c: In function '__unmap_dma_buf': drivers/dma-buf/dma-buf.c:816:5: warning: "CONFIG_DMABUF_DEBUG" is not defined, evaluates to 0 [-Wundef] 816 | #if CONFIG_DMABUF_DEBUG | ^~~~~~~~~~~~~~~~~~~ vim +/CONFIG_DMABUF_DEBUG +676 drivers/dma-buf/dma-buf.c 668 669 static struct sg_table * __map_dma_buf(struct dma_buf_attachment *attach, 670 enum dma_data_direction direction) 671 { 672 struct sg_table *sg_table; 673 674 sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction); 675 677 if (sg_table) { 678 int i; 679 struct scatterlist *sg; 680 681 /* To catch abuse of the underlying struct page by importers mix 682 * up the bits, but take care to preserve the low SG_ bits to 683 * not corrupt the sgt. The mixing is undone in __unmap_dma_buf 684 * before passing the sgt back to the exporter. */ 685 for_each_sgtable_sg(sg_table, sg, i) 686 sg->page_link ^= ~0xffUL; 687 } 688 #endif 689 690 return sg_table; 691 } 692 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org