Re: [v3 1/4] PCI: Introduce generic capability search functions

[kernel test robot]

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/20250321-120748
base:   a1cffe8cc8aef85f1b07c4464f0998b9785b795a
patch link:    https://lore.kernel.org/r/20250321040358.360755-2-18255117159%40163.com
patch subject: [v3 1/4] PCI: Introduce generic capability search functions
config: arm-randconfig-004-20250321 (https://download.01.org/0day-ci/archive/20250321/202503211730.XKhqW2Mw-lkp@xxxxxxxxx/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project c2692afc0a92cd5da140dfcdfff7818a5b8ce997)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250321/202503211730.XKhqW2Mw-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202503211730.XKhqW2Mw-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   In file included from arch/arm/mm/iomap.c:9:
>> include/linux/pci.h:2021:4: warning: no previous prototype for function 'pci_generic_find_capability' [-Wmissing-prototypes]
    2021 | u8 pci_generic_find_capability(void *priv, pci_generic_read_cfg read_cfg,
         |    ^
   include/linux/pci.h:2021:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    2021 | u8 pci_generic_find_capability(void *priv, pci_generic_read_cfg read_cfg,
         | ^
         | static 
>> include/linux/pci.h:2024:5: warning: no previous prototype for function 'pci_generic_find_ext_capability' [-Wmissing-prototypes]
    2024 | u16 pci_generic_find_ext_capability(void *priv, pci_generic_read_cfg read_cfg,
         |     ^
   include/linux/pci.h:2024:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    2024 | u16 pci_generic_find_ext_capability(void *priv, pci_generic_read_cfg read_cfg,
         | ^
         | static 
   2 warnings generated.


vim +/pci_generic_find_capability +2021 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	u8 pci_generic_find_capability(void *priv, pci_generic_read_cfg read_cfg,
  2022				       u8 cap)
  2023	{ return 0; }
> 2024	u16 pci_generic_find_ext_capability(void *priv, pci_generic_read_cfg read_cfg,
  2025					    u8 cap)
  2026	{ return 0; }
  2027	static inline u64 pci_get_dsn(struct pci_dev *dev)
  2028	{ return 0; }
  2029	

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