Hi Gavin,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on arm64/for-next/core]
[also build test ERROR on soc/for-next arm/for-next kvmarm/next v5.9-rc5 next-20200917]
[cannot apply to xlnx/master]
[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/Gavin-Shan/arm64-mm-Enable-color-zero-pages/20200916-112710
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
config: arm64-randconfig-r002-20200917 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 0ff28fa6a75617d61b1aeea77463d6a1684c3c89)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

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

All errors (new ones prefixed by >>):

>> arch/arm64/kernel/cacheinfo.c:62:8: error: implicit declaration of function 'FIELD_PREP' [-Werror,-Wimplicit-function-declaration]
           val = FIELD_PREP(CSSELR_LEVEL_MASK, 0) |
                 ^
>> arch/arm64/kernel/cacheinfo.c:68:16: error: implicit declaration of function 'FIELD_GET' [-Werror,-Wimplicit-function-declaration]
                   size = (1 << FIELD_GET(CCSIDR_64_LS_MASK, val)) *
                                ^
   arch/arm64/kernel/cacheinfo.c:68:16: note: did you mean 'FIELD_PREP'?
   arch/arm64/kernel/cacheinfo.c:62:8: note: 'FIELD_PREP' declared here
           val = FIELD_PREP(CSSELR_LEVEL_MASK, 0) |
                 ^
   arch/arm64/kernel/cacheinfo.c:72:16: error: implicit declaration of function 'FIELD_GET' [-Werror,-Wimplicit-function-declaration]
                   size = (1 << FIELD_GET(CCSIDR_32_LS_MASK, val)) *
                                ^
   3 errors generated.

# https://github.com/0day-ci/linux/commit/ab02baff46e4889747f134626f5cd3566fd90582
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Gavin-Shan/arm64-mm-Enable-color-zero-pages/20200916-112710
git checkout ab02baff46e4889747f134626f5cd3566fd90582
vim +/FIELD_PREP +62 arch/arm64/kernel/cacheinfo.c

    45	
    46	int cache_total_size(void)
    47	{
    48		unsigned int ctype, size;
    49		unsigned long val;
    50		bool ccidx = false;
    51	
    52		/* Check first level cache is supported */
    53		ctype = get_cache_type(1);
    54		if (ctype == CACHE_TYPE_NOCACHE)
    55			return 0;
    56	
    57		/* ARMv8.3-CCIDX is supported or not */
    58		val = read_sanitised_ftr_reg(SYS_ID_MMFR4_EL1);
    59		ccidx = !!(val & (UL(0xF) << ID_AA64MMFR2_CCIDX_SHIFT));
    60	
    61		/* Retrieve the information and calculate the total size */
  > 62		val = FIELD_PREP(CSSELR_LEVEL_MASK, 0) |
    63		      FIELD_PREP(CSSERL_IND_MASK, 0);
    64		write_sysreg(val, csselr_el1);
    65	
    66		val = read_sysreg(ccsidr_el1);
    67		if (ccidx) {
  > 68			size = (1 << FIELD_GET(CCSIDR_64_LS_MASK, val)) *
    69			       (FIELD_GET(CCSIDR_64_ASSOC_MASK, val) + 1) *
    70			       (FIELD_GET(CCSIDR_64_SET_MASK, val) + 1);
    71		} else {
    72			size = (1 << FIELD_GET(CCSIDR_32_LS_MASK, val)) *
    73			       (FIELD_GET(CCSIDR_32_ASSOC_MASK, val) + 1) *
    74			       (FIELD_GET(CCSIDR_32_SET_MASK, val) + 1);
    75		}
    76	
    77		return size;
    78	}
    79	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org