tree:   https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git pending
head:   49a0a694dd717be79d05cdffbae02657d9ee56c7
commit: 2080f92eb80322d4260eb35c17722e68d50a2110 [4/6] cxl/core: Move register mapping infrastructure
config: powerpc64-randconfig-p002-20210803 (attached as .config)
compiler: powerpc-linux-gcc (GCC) 10.3.0
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git/commit/?id=2080f92eb80322d4260eb35c17722e68d50a2110
        git remote add cxl-cxl https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git
        git fetch --no-tags cxl-cxl pending
        git checkout 2080f92eb80322d4260eb35c17722e68d50a2110
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=powerpc64 

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 >>):

   drivers/cxl/core/regs.c: In function 'cxl_probe_component_regs':
>> drivers/cxl/core/regs.c:34:14: error: implicit declaration of function 'readq'; did you mean 'readl'? [-Werror=implicit-function-declaration]
      34 |  cap_array = readq(base + CXL_CM_CAP_HDR_OFFSET);
         |              ^~~~~
         |              readl
   cc1: some warnings being treated as errors


vim +34 drivers/cxl/core/regs.c

     8	
     9	/**
    10	 * cxl_probe_component_regs() - Detect CXL Component register blocks
    11	 * @dev: Host device of the @base mapping
    12	 * @base: Mapping containing the HDM Decoder Capability Header
    13	 * @map: Map object describing the register block information found
    14	 *
    15	 * See CXL 2.0 8.2.4 Component Register Layout and Definition
    16	 * See CXL 2.0 8.2.5.5 CXL Device Register Interface
    17	 *
    18	 * Probe for component register information and return it in map object.
    19	 */
    20	void cxl_probe_component_regs(struct device *dev, void __iomem *base,
    21				      struct cxl_component_reg_map *map)
    22	{
    23		int cap, cap_count;
    24		u64 cap_array;
    25	
    26		*map = (struct cxl_component_reg_map) { 0 };
    27	
    28		/*
    29		 * CXL.cache and CXL.mem registers are at offset 0x1000 as defined in
    30		 * CXL 2.0 8.2.4 Table 141.
    31		 */
    32		base += CXL_CM_OFFSET;
    33	
  > 34		cap_array = readq(base + CXL_CM_CAP_HDR_OFFSET);
    35	
    36		if (FIELD_GET(CXL_CM_CAP_HDR_ID_MASK, cap_array) != CM_CAP_HDR_CAP_ID) {
    37			dev_err(dev,
    38				"Couldn't locate the CXL.cache and CXL.mem capability array header./n");
    39			return;
    40		}
    41	
    42		/* It's assumed that future versions will be backward compatible */
    43		cap_count = FIELD_GET(CXL_CM_CAP_HDR_ARRAY_SIZE_MASK, cap_array);
    44	
    45		for (cap = 1; cap <= cap_count; cap++) {
    46			void __iomem *register_block;
    47			u32 hdr;
    48			int decoder_cnt;
    49			u16 cap_id, offset;
    50			u32 length;
    51	
    52			hdr = readl(base + cap * 0x4);
    53	
    54			cap_id = FIELD_GET(CXL_CM_CAP_HDR_ID_MASK, hdr);
    55			offset = FIELD_GET(CXL_CM_CAP_PTR_MASK, hdr);
    56			register_block = base + offset;
    57	
    58			switch (cap_id) {
    59			case CXL_CM_CAP_CAP_ID_HDM:
    60				dev_dbg(dev, "found HDM decoder capability (0x%x)\n",
    61					offset);
    62	
    63				hdr = readl(register_block);
    64	
    65				decoder_cnt = cxl_hdm_decoder_count(hdr);
    66				length = 0x20 * decoder_cnt + 0x10;
    67	
    68				map->hdm_decoder.valid = true;
    69				map->hdm_decoder.offset = CXL_CM_OFFSET + offset;
    70				map->hdm_decoder.size = length;
    71				break;
    72			default:
    73				dev_dbg(dev, "Unknown CM cap ID: %d (0x%x)\n", cap_id,
    74					offset);
    75				break;
    76			}
    77		}
    78	}
    79	EXPORT_SYMBOL_GPL(cxl_probe_component_regs);
    80	

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