[tip:x86/platform 6/6] arch/x86/pci/mmconfig-shared.c:823:9: error: implicit declaration of function 'pci_mmcfg_read'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/platform
head:   5d381c2e053918bd67c2d1cc50fc73c35bd547f7
commit: 5d381c2e053918bd67c2d1cc50fc73c35bd547f7 [6/6] x86/PCI/mmcfg: Switch to ECAM config mode if possible
config: x86_64-allyesdebian+CONFIG_DEBUG_INFO_REDUCED (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 5d381c2e053918bd67c2d1cc50fc73c35bd547f7
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   arch/x86/pci/mmconfig-shared.c: In function 'pci_ecam_read':
>> arch/x86/pci/mmconfig-shared.c:823:9: error: implicit declaration of function 'pci_mmcfg_read' [-Werror=implicit-function-declaration]
     return pci_mmcfg_read(pci_domain_nr(bus), bus->number, devfn, reg,
            ^~~~~~~~~~~~~~
   arch/x86/pci/mmconfig-shared.c: In function 'pci_ecam_write':
>> arch/x86/pci/mmconfig-shared.c:830:9: error: implicit declaration of function 'pci_mmcfg_write' [-Werror=implicit-function-declaration]
     return pci_mmcfg_write(pci_domain_nr(bus), bus->number, devfn, reg,
            ^~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/pci_mmcfg_read +823 arch/x86/pci/mmconfig-shared.c

   817		return -ENOENT;
   818	}
   819	
   820	static int pci_ecam_read(struct pci_bus *bus, unsigned int devfn, int reg,
   821				 int size, u32 *value)
   822	{
 > 823		return pci_mmcfg_read(pci_domain_nr(bus), bus->number, devfn, reg,
   824				      size, value);
   825	}
   826	
   827	static int pci_ecam_write(struct pci_bus *bus, unsigned int devfn, int reg,
   828				  int size, u32 value)
   829	{
 > 830		return pci_mmcfg_write(pci_domain_nr(bus), bus->number, devfn, reg,
   831				       size, value);
   832	}
   833	

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