[intel-tdx:tdx/guest-rebased 105/133] kernel/dma/swiotlb.c:320:14: warning: incompatible integer to pointer conversion assigning to 'unsigned long *' from 'int'

[kernel test robot <lkp@intel.com>]

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-lkp@intel.com/config)
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@intel.com>

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);
                ^
>> kernel/dma/swiotlb.c:320:14: warning: incompatible integer to pointer conversion assigning to 'unsigned long *' from 'int' [-Wint-conversion]
           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	
 > 320		mem->bitmap = kzalloc(DIV_ROUND_UP(nslabs, BITS_PER_BYTE), GFP_KERNEL);
   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