tree: https://github.com/0day-ci/linux/commits/UPDATE-20210115-235216/Daniel-Ve... head: 5457ba7e82f3b6571b48979c717f5640f3c81942 commit: 5457ba7e82f3b6571b48979c717f5640f3c81942 dma-buf: Add debug option date: 3 hours ago config: x86_64-randconfig-a015-20210115 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 5b42fd8dd4e7e29125a09a41a33af7c9cb57d144) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/0day-ci/linux/commit/5457ba7e82f3b6571b48979c717f5640f... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review UPDATE-20210115-235216/Daniel-Vetter/drm-buf-Add-debug-option/20210115-210650 git checkout 5457ba7e82f3b6571b48979c717f5640f3c81942 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 >>): #if CONFIG_DMABUF_DEBUG ^ 1 warning generated. vim +/CONFIG_DMABUF_DEBUG +671 drivers/dma-buf/dma-buf.c 668 669 static void mangle_sg_table(struct sg_table *sg_table) 670 { 672 int i; 673 struct scatterlist *sg; 674 675 if (!sg_table) 676 return; 677 678 /* To catch abuse of the underlying struct page by importers mix 679 * up the bits, but take care to preserve the low SG_ bits to 680 * not corrupt the sgt. The mixing is undone in __unmap_dma_buf 681 * before passing the sgt back to the exporter. */ 682 for_each_sgtable_sg(sg_table, sg, i) 683 sg->page_link ^= ~0xffUL; 684 #endif 685 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org