[palmer:riscv-zicbom_fix 7/7] arch/riscv/mm/dma-noncoherent.c:15:14: error: redefinition of 'riscv_cbom_block_size' with a different type: 'unsigned int' vs 'int'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/palmer/linux.git riscv-zicbom_fix
head:   933c80bff1907722a069a0d8bdce283183e4b203
commit: 933c80bff1907722a069a0d8bdce283183e4b203 [7/7] RISC-V: Clean up the Zicbom block size probing
config: riscv-buildonly-randconfig-r005-20220912 (https://download.01.org/0day-ci/archive/20220913/202209131858.0qmW0TEk-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 1546df49f5a6d09df78f569e4137ddb365a3e827)
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 riscv cross compiling tool for clang build
        # apt-get install binutils-riscv-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/palmer/linux.git/commit/?id=933c80bff1907722a069a0d8bdce283183e4b203
        git remote add palmer https://git.kernel.org/pub/scm/linux/kernel/git/palmer/linux.git
        git fetch --no-tags palmer riscv-zicbom_fix
        git checkout 933c80bff1907722a069a0d8bdce283183e4b203
        # 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=riscv SHELL=/bin/bash arch/riscv/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> arch/riscv/mm/dma-noncoherent.c:15:14: error: redefinition of 'riscv_cbom_block_size' with a different type: 'unsigned int' vs 'int'
   unsigned int riscv_cbom_block_size;
                ^
   arch/riscv/include/asm/cacheflush.h:46:12: note: previous declaration is here
   extern int riscv_cbom_block_size;
              ^
   1 error generated.


vim +15 arch/riscv/mm/dma-noncoherent.c

    14	
  > 15	unsigned int riscv_cbom_block_size;
    16	static bool noncoherent_supported;
    17	

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