Hi Dan,

I love your patch! Perhaps something to improve:

[auto build test WARNING on a38fd8748464831584a19438cbb3082b5a2dab15]

url:    https://github.com/0day-ci/linux/commits/Dan-Williams/CXL-Port-Enumeration-and-Plans-for-v5-14/20210508-065317
base:   a38fd8748464831584a19438cbb3082b5a2dab15
config: i386-randconfig-a003-20210507 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/10f83390eae24effd86455f46429d03ae7c35f53
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Dan-Williams/CXL-Port-Enumeration-and-Plans-for-v5-14/20210508-065317
        git checkout 10f83390eae24effd86455f46429d03ae7c35f53
        # save the attached .config to linux build tree
        make W=1 W=1 ARCH=i386 

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

All warnings (new ones prefixed by >>):

   drivers/cxl/acpi.c: In function 'cxl_acpi_register_ports':
>> drivers/cxl/acpi.c:76:55: warning: conversion from 'long long unsigned int' to 'resource_size_t' {aka 'unsigned int'} changes value from '18446744073709551615' to '4294967295' [-Woverflow]
      76 |  port = devm_cxl_add_port(dev, port, &root->dev, idx, ~0ULL);
         |                                                       ^~~~~


vim +76 drivers/cxl/acpi.c

    61	
    62	/*
    63	 * A host bridge may contain one or more root ports.  Register each port
    64	 * as a child of the cxl_root.
    65	 */
    66	static int cxl_acpi_register_ports(struct device *dev, struct acpi_device *root,
    67					   struct cxl_port *port, int idx)
    68	{
    69		struct acpi_pci_root *pci_root = acpi_pci_find_root(root->handle);
    70		struct cxl_walk_context ctx;
    71	
    72		if (!pci_root)
    73			return -ENXIO;
    74	
    75		/* TODO: fold in CEDT.CHBS retrieval */
  > 76		port = devm_cxl_add_port(dev, port, &root->dev, idx, ~0ULL);
    77		if (IS_ERR(port))
    78			return PTR_ERR(port);
    79		dev_dbg(dev, "%s: register: %s\n", dev_name(&root->dev),
    80			dev_name(&port->dev));
    81	
    82		ctx = (struct cxl_walk_context) {
    83			.dev = dev,
    84			.root = pci_root->bus,
    85			.port = port,
    86		};
    87		pci_walk_bus(pci_root->bus, match_add_root_ports, &ctx);
    88	
    89		if (ctx.count == 0)
    90			return -ENODEV;
    91		return ctx.error;
    92	}
    93	

---
0-DAY CI Kernel Test Service, Intel Corporation
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