[linux-next:master 3951/5720] drivers/pci/endpoint/functions/pci-epf-vntb.c:975:5: warning: no previous prototype for 'pci_read'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   2f9cb3d3bd73fc2225d66aa8fcffb632ed3eb235
commit: ff32fac00d97661c715ee47bbfd867cae1f3aaf8 [3951/5720] NTB: EPF: support NTB transfer between PCI RC and EP connection
config: ia64-randconfig-r006-20220625
compiler: ia64-linux-gcc (GCC) 11.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=ff32fac00d97661c715ee47bbfd867cae1f3aaf8
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout ff32fac00d97661c715ee47bbfd867cae1f3aaf8
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=ia64 SHELL=/bin/bash drivers/pci/endpoint/functions/

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

All warnings (new ones prefixed by >>):

   In file included from arch/ia64/include/asm/pgtable.h:153,
                    from include/linux/pgtable.h:6,
                    from arch/ia64/include/asm/uaccess.h:40,
                    from include/linux/uaccess.h:11,
                    from arch/ia64/include/asm/sections.h:11,
                    from include/linux/interrupt.h:21,
                    from include/linux/pci.h:38,
                    from include/linux/pci-epf.h:15,
                    from include/linux/pci-epc.h:12,
                    from drivers/pci/endpoint/functions/pci-epf-vntb.c:44:
   arch/ia64/include/asm/mmu_context.h: In function 'reload_context':
   arch/ia64/include/asm/mmu_context.h:127:48: warning: variable 'old_rr4' set but not used [-Wunused-but-set-variable]
     127 |         unsigned long rr0, rr1, rr2, rr3, rr4, old_rr4;
         |                                                ^~~~~~~
   drivers/pci/endpoint/functions/pci-epf-vntb.c: At top level:
>> drivers/pci/endpoint/functions/pci-epf-vntb.c:975:5: warning: no previous prototype for 'pci_read' [-Wmissing-prototypes]
     975 | int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val)
         |     ^~~~~~~~
>> drivers/pci/endpoint/functions/pci-epf-vntb.c:984:5: warning: no previous prototype for 'pci_write' [-Wmissing-prototypes]
     984 | int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val)
         |     ^~~~~~~~~
   {standard input}: Assembler messages:
   {standard input}:8744: Error: Register number out of range 0..3
   {standard input}:8745: Error: Register number out of range 0..3
   {standard input}:8745: Warning: Use of 'mov' violates WAW dependency 'GR%, % in 1 - 127' (impliedf), specific resource number is 47
   {standard input}:8745: Warning: Only the first path encountering the conflict is reported
   {standard input}:8744: Warning: This is the location of the conflicting usage
   {standard input}:8746: Error: Register number out of range 0..3
   {standard input}:8746: Warning: Use of 'mov' violates WAW dependency 'GR%, % in 1 - 127' (impliedf), specific resource number is 47
   {standard input}:8746: Warning: Only the first path encountering the conflict is reported
   {standard input}:8744: Warning: This is the location of the conflicting usage
   {standard input}:8746: Warning: Use of 'mov' violates WAW dependency 'GR%, % in 1 - 127' (impliedf), specific resource number is 47
   {standard input}:8746: Warning: Only the first path encountering the conflict is reported
   {standard input}:8745: Warning: This is the location of the conflicting usage
   {standard input}:8750: Error: Register number out of range 0..3


vim +/pci_read +975 drivers/pci/endpoint/functions/pci-epf-vntb.c

   974	
 > 975	int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val)
   976	{
   977		if (devfn == 0) {
   978			memcpy(val, ((uint8_t *)pci_space) + where, size);
   979			return 0;
   980		}
   981		return -1;
   982	}
   983	
 > 984	int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val)
   985	{
   986		return 0;
   987	}
   988	

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