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

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

Hi Hans,

kernel test robot noticed the following build errors:

[auto build test ERROR 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: arc-randconfig-001-20250321 (https://download.01.org/0day-ci/archive/20250321/202503211714.tv7E2QkK-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 13.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250321/202503211714.tv7E2QkK-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/202503211714.tv7E2QkK-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/pci/pci.c:691:5: error: conflicting types for 'pci_generic_find_ext_capability'; have 'u16(void *, u32 (*)(void *, int,  int), int)' {aka 'short unsigned int(void *, unsigned int (*)(void *, int,  int), int)'}
     691 | u16 pci_generic_find_ext_capability(void *priv, pci_generic_read_cfg read_cfg,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   In file included from drivers/pci/pci.c:18:
   include/linux/pci.h:1211:5: note: previous declaration of 'pci_generic_find_ext_capability' with type 'u16(void *, u32 (*)(void *, int,  int), u8)' {aka 'short unsigned int(void *, unsigned int (*)(void *, int,  int), unsigned char)'}
    1211 | u16 pci_generic_find_ext_capability(void *priv, pci_generic_read_cfg read_cfg,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   In file included from include/linux/linkage.h:7,
                    from include/linux/preempt.h:10,
                    from include/linux/spinlock.h:56,
                    from include/linux/mmzone.h:8,
                    from include/linux/gfp.h:7,
                    from include/linux/slab.h:16,
                    from include/linux/resource_ext.h:11,
                    from include/linux/acpi.h:13,
                    from drivers/pci/pci.c:11:
   drivers/pci/pci.c:696:19: error: conflicting types for 'pci_generic_find_ext_capability'; have 'u16(void *, u32 (*)(void *, int,  int), int)' {aka 'short unsigned int(void *, unsigned int (*)(void *, int,  int), int)'}
     696 | EXPORT_SYMBOL_GPL(pci_generic_find_ext_capability);
         |                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/export.h:70:28: note: in definition of macro '__EXPORT_SYMBOL'
      70 |         extern typeof(sym) sym;                                 \
         |                            ^~~
   include/linux/export.h:84:41: note: in expansion of macro '_EXPORT_SYMBOL'
      84 | #define EXPORT_SYMBOL_GPL(sym)          _EXPORT_SYMBOL(sym, "GPL")
         |                                         ^~~~~~~~~~~~~~
   drivers/pci/pci.c:696:1: note: in expansion of macro 'EXPORT_SYMBOL_GPL'
     696 | EXPORT_SYMBOL_GPL(pci_generic_find_ext_capability);
         | ^~~~~~~~~~~~~~~~~
   include/linux/pci.h:1211:5: note: previous declaration of 'pci_generic_find_ext_capability' with type 'u16(void *, u32 (*)(void *, int,  int), u8)' {aka 'short unsigned int(void *, unsigned int (*)(void *, int,  int), unsigned char)'}
    1211 | u16 pci_generic_find_ext_capability(void *priv, pci_generic_read_cfg read_cfg,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +691 drivers/pci/pci.c

   690	
 > 691	u16 pci_generic_find_ext_capability(void *priv, pci_generic_read_cfg read_cfg,
   692					    int cap)
   693	{
   694		return pci_generic_find_next_ext_capability(priv, read_cfg, 0, cap);
   695	}
   696	EXPORT_SYMBOL_GPL(pci_generic_find_ext_capability);
   697	

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