[djiang:pci-mbox 2/9] drivers/pci/mrb.c:55: warning: Function parameter or struct member 'dev_type' not described in 'mmio_find_regblock_instance'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/djiang/linux.git pci-mbox
head:   9c38a15525283584d0d49404c11c397fe71ba1e8
commit: a08c6a2a48f9dea06ca214c1d3cd9c199098e25b [2/9] PCI: Add discovery of MMIO register block common helpers
config: x86_64-buildonly-randconfig-001-20240510 (https://download.01.org/0day-ci/archive/20240510/202405102051.D264as1O-lkp@intel.com/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240510/202405102051.D264as1O-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405102051.D264as1O-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/pci/mrb.c:55: warning: Function parameter or struct member 'dev_type' not described in 'mmio_find_regblock_instance'
>> drivers/pci/mrb.c:55: warning: Function parameter or struct member 'index' not described in 'mmio_find_regblock_instance'
>> drivers/pci/mrb.c:55: warning: expecting prototype for mmio_find_regblock(). Prototype was for mmio_find_regblock_instance() instead
--
>> drivers/cxl/core/regs.c:599: warning: expecting prototype for cxl_find_regblock_instance(). Prototype was for cxl_find_dvsec_regblock_instance() instead


vim +55 drivers/pci/mrb.c

    40	
    41	/**
    42	 * mmio_find_regblock() - Locate MMIO register blocks by type
    43	 * @pdev: The PCI device to enumerate
    44	 * @type: Register Block ID
    45	 * @map: Enumeration output, clobbered on error
    46	 *
    47	 * Return: 0 if register block enumerated, negative error code otherwise
    48	 *
    49	 * One or more register blocks may exist, search for them by @type.
    50	 */
    51	int mmio_find_regblock_instance(struct pci_dev *pdev,
    52					enum mrb_dev_type dev_type, int type,
    53					struct mmio_register_map *map,
    54					int index)
  > 55	{
    56		u32 mrbl_size, mrbl_blocks;
    57		int instance = 0;
    58		int mloc, i;
    59	
    60		*map = (struct mmio_register_map) {
    61			.dev_type = dev_type,
    62			.host = &pdev->dev,
    63			.resource = MMIO_RESOURCE_NONE,
    64		};
    65	
    66		switch (dev_type) {
    67		case DEV_TYPE_PCI:
    68			mloc = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_MRBL);
    69			pci_read_config_dword(pdev, mloc + PCI_MRBL_CAP, &mrbl_size);
    70			mrbl_size = PCI_MRBL_LEN(mrbl_size);
    71			mloc += PCI_MRBL_REG_LOCATOR_BLOCK1_OFFSET;
    72			mrbl_blocks = (mrbl_size - PCI_MRBL_REG_LOCATOR_BLOCK1_OFFSET) / 8;
    73			break;
    74		case DEV_TYPE_CXL:
    75			mloc = pci_find_dvsec_capability(pdev, PCI_VENDOR_ID_CXL,
    76							 CXL_DVSEC_REG_LOCATOR);
    77			pci_read_config_dword(pdev, mloc + PCI_DVSEC_HEADER1, &mrbl_size);
    78			mrbl_size = PCI_DVSEC_HEADER1_LEN(mrbl_size);
    79			mloc += CXL_DVSEC_REG_LOCATOR_BLOCK1_OFFSET;
    80			mrbl_blocks = (mrbl_size - CXL_DVSEC_REG_LOCATOR_BLOCK1_OFFSET) / 8;
    81			break;
    82		default:
    83			return -EINVAL;
    84		}
    85	
    86		if (!mloc)
    87			return -ENXIO;
    88	
    89		for (i = 0; i < mrbl_blocks; i++, mloc += 8) {
    90			u32 reg_lo, reg_hi;
    91	
    92			pci_read_config_dword(pdev, mloc, &reg_lo);
    93			pci_read_config_dword(pdev, mloc + 4, &reg_hi);
    94	
    95			if (!decode_regblock(pdev, reg_lo, reg_hi, map))
    96				continue;
    97	
    98			if (map->reg_type == type) {
    99				if (index == instance)
   100					return 0;
   101				instance++;
   102			}
   103		}
   104	
   105		map->resource = MMIO_RESOURCE_NONE;
   106	
   107		return -ENODEV;
   108	}
   109	EXPORT_SYMBOL_GPL(mmio_find_regblock_instance);
   110	

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