Re: [v4 1/4] PCI: Introduce generic capability search functions

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

Hi Hans,

kernel test robot noticed the following build warnings:

[auto build test WARNING on a1cffe8cc8aef85f1b07c4464f0998b9785b795a]

url:    https://github.com/intel-lab-lkp/linux/commits/Hans-Zhang/PCI-Introduce-generic-capability-search-functions/20250321-182140
base:   a1cffe8cc8aef85f1b07c4464f0998b9785b795a
patch link:    https://lore.kernel.org/r/20250321101710.371480-2-18255117159%40163.com
patch subject: [v4 1/4] PCI: Introduce generic capability search functions
config: arc-randconfig-002-20250321 (https://download.01.org/0day-ci/archive/20250321/202503212059.oxvxSlCc-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 11.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250321/202503212059.oxvxSlCc-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/202503212059.oxvxSlCc-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/nvme/host/nvme.h:11,
                    from drivers/nvme/host/fc.c:13:
>> include/linux/pci.h:2024:12: warning: 'pci_generic_find_ext_capability' defined but not used [-Wunused-function]
    2024 | static u16 pci_generic_find_ext_capability(void *priv,
         |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/pci.h:2021:11: warning: 'pci_generic_find_capability' defined but not used [-Wunused-function]
    2021 | static u8 pci_generic_find_capability(void *priv, pci_generic_read_cfg read_cfg,
         |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/pci_generic_find_ext_capability +2024 include/linux/pci.h

  1999	
  2000	static inline void pci_set_master(struct pci_dev *dev) { }
  2001	static inline void pci_clear_master(struct pci_dev *dev) { }
  2002	static inline int pci_enable_device(struct pci_dev *dev) { return -EIO; }
  2003	static inline void pci_disable_device(struct pci_dev *dev) { }
  2004	static inline int pcim_enable_device(struct pci_dev *pdev) { return -EIO; }
  2005	static inline int pci_assign_resource(struct pci_dev *dev, int i)
  2006	{ return -EBUSY; }
  2007	static inline int __must_check __pci_register_driver(struct pci_driver *drv,
  2008							     struct module *owner,
  2009							     const char *mod_name)
  2010	{ return 0; }
  2011	static inline int pci_register_driver(struct pci_driver *drv)
  2012	{ return 0; }
  2013	static inline void pci_unregister_driver(struct pci_driver *drv) { }
  2014	static inline u8 pci_find_capability(struct pci_dev *dev, int cap)
  2015	{ return 0; }
  2016	static inline u8 pci_find_next_capability(struct pci_dev *dev, u8 post, int cap)
  2017	{ return 0; }
  2018	static inline u16 pci_find_ext_capability(struct pci_dev *dev, int cap)
  2019	{ return 0; }
  2020	typedef u32 (*pci_generic_read_cfg)(void *priv, int where, int size);
> 2021	static u8 pci_generic_find_capability(void *priv, pci_generic_read_cfg read_cfg,
  2022					      u8 cap)
  2023	{ return 0; }
> 2024	static u16 pci_generic_find_ext_capability(void *priv,
  2025						   pci_generic_read_cfg read_cfg,
  2026						   u8 cap)
  2027	{ return 0; }
  2028	static inline u64 pci_get_dsn(struct pci_dev *dev)
  2029	{ return 0; }
  2030	

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https://github.com/intel/lkp-tests/wiki