tree: https://github.com/intel/tdx.git tdx/guest-rebased head: e3995864d37c56f431c93fc3dc454d9c65f5e9ea commit: 64f46677f0bd4db290a0c6be857c6fd8db39324b [105/133] swiotlb: use bitmap to track free slots config: s390-randconfig-r033-20220113 (https://download.01.org/0day-ci/archive/20220114/202201140332.Rabd9rIb-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d1021978b8e7e35dcc30201ca1731d64b5a602a8) 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 s390 cross compiling tool for clang build # apt-get install binutils-s390x-linux-gnu # https://github.com/intel/tdx/commit/64f46677f0bd4db290a0c6be857c6fd8db39324b git remote add intel-tdx https://github.com/intel/tdx.git git fetch --no-tags intel-tdx tdx/guest-rebased git checkout 64f46677f0bd4db290a0c6be857c6fd8db39324b # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash kernel/dma/ 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 >>): In file included from kernel/dma/swiotlb.c:24: In file included from include/linux/dma-direct.h:9: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:75: include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __raw_readb(PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:36:59: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x)) ^ include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16' #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x)) ^ In file included from kernel/dma/swiotlb.c:24: In file included from include/linux/dma-direct.h:9: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:75: include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32' #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x)) ^ In file included from kernel/dma/swiotlb.c:24: In file included from include/linux/dma-direct.h:9: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:75: include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writeb(value, PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ kernel/dma/swiotlb.c:320:16: error: implicit declaration of function 'kzalloc' [-Werror,-Wimplicit-function-declaration] mem->bitmap = kzalloc(DIV_ROUND_UP(nslabs, BITS_PER_BYTE), GFP_KERNEL); ^ kernel/dma/swiotlb.c:320:16: note: did you mean 'vzalloc'? include/linux/vmalloc.h:140:14: note: 'vzalloc' declared here extern void *vzalloc(unsigned long size) __alloc_size(1); ^ mem->bitmap = kzalloc(DIV_ROUND_UP(nslabs, BITS_PER_BYTE), GFP_KERNEL); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/dma/swiotlb.c:324:3: error: implicit declaration of function 'kfree' [-Werror,-Wimplicit-function-declaration] kfree(mem->bitmap); ^ kernel/dma/swiotlb.c:324:3: note: did you mean 'vfree'? include/linux/vmalloc.h:155:13: note: 'vfree' declared here extern void vfree(const void *addr); ^ 13 warnings and 2 errors generated. vim +320 kernel/dma/swiotlb.c 306 307 int 308 swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs) 309 { 310 struct io_tlb_mem *mem = &io_tlb_default_mem; 311 unsigned long bytes = nslabs << IO_TLB_SHIFT; 312 313 if (swiotlb_force == SWIOTLB_NO_FORCE) 314 return 0; 315 316 /* protect against double initialization */ 317 if (WARN_ON_ONCE(mem->nslabs)) 318 return -ENOMEM; 319 321 mem->slots = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 322 get_order(array_size(sizeof(*mem->slots), nslabs))); 323 if (!mem->slots || !mem->bitmap) { 324 kfree(mem->bitmap); 325 kfree(mem->slots); 326 return -ENOMEM; 327 } 328 329 set_memory_decrypted((unsigned long)tlb, bytes >> PAGE_SHIFT); 330 swiotlb_init_io_tlb_mem(mem, virt_to_phys(tlb), nslabs, true); 331 332 swiotlb_print_info(); 333 swiotlb_set_max_segment(mem->nslabs << IO_TLB_SHIFT); 334 return 0; 335 } 336 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org