[arnd-asm-generic:dma-sync-rework 12/20] arch/mips/mm/dma-noncoherent.c:63:11: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int

[kernel test robot <lkp@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git dma-sync-rework
head:   9a711fbea373208c1eeb2fafb0c744bc23a79a43
commit: 4a04caf3aca03b0132be4519f2064ce6fc6a0f24 [12/20] mips: dma-mapping: split out cache operation logic
config: mips-randconfig-r005-20230323 (https://download.01.org/0day-ci/archive/20230325/202303250032.EFuGiCmv-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 67409911353323ca5edf2049ef0df54132fa1ca7)
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 mips cross compiling tool for clang build
        # apt-get install binutils-mipsel-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git/commit/?id=4a04caf3aca03b0132be4519f2064ce6fc6a0f24
        git remote add arnd-asm-generic https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git
        git fetch --no-tags arnd-asm-generic dma-sync-rework
        git checkout 4a04caf3aca03b0132be4519f2064ce6fc6a0f24
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash arch/mips/mm/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202303250032.EFuGiCmv-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

>> arch/mips/mm/dma-noncoherent.c:63:11: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
                   (void)(*cache_op)(unsigned long start, unsigned long size));
                           ^
                          int
   arch/mips/mm/dma-noncoherent.c:63:4: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
                   (void)(*cache_op)(unsigned long start, unsigned long size));
                    ^
                   int
>> arch/mips/mm/dma-noncoherent.c:63:9: error: function cannot return function type 'int (unsigned long, unsigned long)'
                   (void)(*cache_op)(unsigned long start, unsigned long size));
                         ^
>> arch/mips/mm/dma-noncoherent.c:64:1: error: expected identifier or '('
   {
   ^
   4 errors generated.


vim +/int +63 arch/mips/mm/dma-noncoherent.c

    56	
    57	/*
    58	 * A single sg entry may refer to multiple physically contiguous pages.  But
    59	 * we still need to process highmem pages individually.  If highmem is not
    60	 * configured then the bulk of this loop gets optimized out.
    61	 */
    62	static inline void dma_sync_phys(phys_addr_t paddr, size_t size,
  > 63			(void)(*cache_op)(unsigned long start, unsigned long size));
  > 64	{
    65		struct page *page = pfn_to_page(paddr >> PAGE_SHIFT);
    66		unsigned long offset = paddr & ~PAGE_MASK;
    67		size_t left = size;
    68	
    69		do {
    70			size_t len = left;
    71			void *addr;
    72	
    73			if (PageHighMem(page)) {
    74				if (offset + len > PAGE_SIZE)
    75					len = PAGE_SIZE - offset;
    76			}
    77	
    78			addr = kmap_atomic(page);
    79			cache_op(addr + offset, len);
    80			kunmap_atomic(addr);
    81	
    82			offset = 0;
    83			page++;
    84			left -= len;
    85		} while (left);
    86	}
    87	

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