Hi Ben,

I love your patch! Yet something to improve:

[auto build test ERROR on 53989fad1286e652ea3655ae3367ba698da8d2ff]

url:    https://github.com/0day-ci/linux/commits/Ben-Widawsky/Add-drivers-for-CXL-ports-and-mem-devices/20211120-080513
base:   53989fad1286e652ea3655ae3367ba698da8d2ff
config: alpha-randconfig-r026-20211118 (attached as .config)
compiler: alpha-linux-gcc (GCC) 11.2.0
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://github.com/0day-ci/linux/commit/8ff43502e84dd4fa1296a131cb0cc82146389db4
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Ben-Widawsky/Add-drivers-for-CXL-ports-and-mem-devices/20211120-080513
        git checkout 8ff43502e84dd4fa1296a131cb0cc82146389db4
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=alpha 

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/port.c: In function 'get_decoder_size':
>> drivers/cxl/port.c:105:16: error: implicit declaration of function 'ioread64_hi_lo' [-Werror=implicit-function-declaration]
     105 |         return ioread64_hi_lo(hdm_decoder +
         |                ^~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/ioread64_hi_lo +105 drivers/cxl/port.c

    97	
    98	static u64 get_decoder_size(void __iomem *hdm_decoder, int n)
    99	{
   100		u32 ctrl = readl(hdm_decoder + CXL_HDM_DECODER0_CTRL_OFFSET(n));
   101	
   102		if (ctrl & CXL_HDM_DECODER0_CTRL_COMMITTED)
   103			return 0;
   104	
 > 105		return ioread64_hi_lo(hdm_decoder +
   106				      CXL_HDM_DECODER0_SIZE_LOW_OFFSET(n));
   107	}
   108	

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