Hi Ashish, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on tip/x86/core] [also build test WARNING on tip/x86/mm hch-configfs/for-next v5.10-rc4 next-20201117] [cannot apply to swiotlb/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] url: https://github.com/0day-ci/linux/commits/Ashish-Kalra/swiotlb-Adjust-SWIO... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 238c91115cd05c71447ea071624a4c9fe661f970 config: ia64-randconfig-r004-20201117 (attached as .config) compiler: ia64-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 # https://github.com/0day-ci/linux/commit/ec17437123f45040f2139e36122a4021f... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Ashish-Kalra/swiotlb-Adjust-SWIOTBL-bounce-buffer-size-for-SEV-guests/20201118-020049 git checkout ec17437123f45040f2139e36122a4021f1fd3b07 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=ia64 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 >>): 166 | unsigned long __init __weak arch_swiotlb_adjust(unsigned long size) | ^~~~~~~~~~~~~~~~~~~ kernel/dma/swiotlb.c:305:1: warning: no previous prototype for 'swiotlb_late_init_with_default_size' [-Wmissing-prototypes] 305 | swiotlb_late_init_with_default_size(size_t default_size) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/arch_swiotlb_adjust +166 kernel/dma/swiotlb.c 165 167 { 168 return 0; 169 } 170 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org