Hi Claire, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v5.11-rc6 next-20210125] [cannot apply to swiotlb/linux-next robh/for-next xen-tip/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/Claire-Chang/Restricted-DMA/2021... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 61556703b610a104de324e4f061dc6cf7b218b46 config: powerpc64-randconfig-r013-20210209 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476) 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 powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # https://github.com/0day-ci/linux/commit/6efc25e988b76cfd9934a78fbd2f096b8... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Claire-Chang/Restricted-DMA/20210209-142608 git checkout 6efc25e988b76cfd9934a78fbd2f096b89182fac # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 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 >>): memblock_free_early(vstart, ^~~~~~ include/linux/memblock.h:443:52: note: passing argument to parameter 'base' here static inline void memblock_free_early(phys_addr_t base, ^ 1 error generated. vim +59 arch/powerpc/platforms/pseries/svm.c 38 39 /* 40 * Initialize SWIOTLB. Essentially the same as swiotlb_init(), except that it 41 * can allocate the buffer anywhere in memory. Since the hypervisor doesn't have 42 * any addressing limitation, we don't need to allocate it in low addresses. 43 */ 44 void __init svm_swiotlb_init(void) 45 { 46 unsigned char *vstart; 47 unsigned long bytes, io_tlb_nslabs; 48 49 io_tlb_nslabs = (swiotlb_size_or_default() >> IO_TLB_SHIFT); 50 io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); 51 52 bytes = io_tlb_nslabs << IO_TLB_SHIFT; 53 54 vstart = memblock_alloc(PAGE_ALIGN(bytes), PAGE_SIZE); 55 if (vstart && !swiotlb_init_with_tbl(vstart, io_tlb_nslabs, false)) 56 return; 57 58 if (vstart) 60 PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT)); 61 panic("SVM: Cannot allocate SWIOTLB buffer"); 62 } 63 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org