[lpieralisi-pci:pci/mips 2/3] drivers/pci/controller/pci-loongson.c:120:15: warning: no previous prototype for function 'pci_loongson_map_bus'

[lpieralisi-pci:pci/mips 2/3] drivers/pci/controller/pci-loongson.c:120:15: warning: no previous prototype for function 'pci_loongson_map_bus'

[kbuild test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/pci.git pci/mips
head:   783399b028bd386a2969d3d0a292afc48260ab70
commit: b73ad3d4e22e3466ebc8af1f2e04b307b729eb05 [2/3] PCI: Add Loongson PCI Controller support
config: x86_64-allyesconfig (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 3393cc4cebf9969db94dc424b7a2b6195589c33b)
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
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        git checkout b73ad3d4e22e3466ebc8af1f2e04b307b729eb05
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

drivers/pci/controller/pci-loongson.c:49:6: warning: unused variable 'tmp' [-Wunused-variable]
u16 tmp;
^
>> drivers/pci/controller/pci-loongson.c:120:15: warning: no previous prototype for function 'pci_loongson_map_bus' [-Wmissing-prototypes]
void __iomem *pci_loongson_map_bus(struct pci_bus *bus, unsigned int devfn,
^
drivers/pci/controller/pci-loongson.c:120:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void __iomem *pci_loongson_map_bus(struct pci_bus *bus, unsigned int devfn,
^
static
2 warnings generated.

vim +/pci_loongson_map_bus +120 drivers/pci/controller/pci-loongson.c

   119	
 > 120	void __iomem *pci_loongson_map_bus(struct pci_bus *bus, unsigned int devfn,
   121				       int where)
   122	{
   123		unsigned char busnum = bus->number;
   124		struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
   125		struct loongson_pci *priv =  pci_host_bridge_priv(bridge);
   126	
   127		/*
   128		 * Do not read more than one device on the bus other than
   129		 * the host bus. For our hardware the root bus is always bus 0.
   130		 */
   131		if (priv->flags & FLAG_DEV_FIX && busnum != 0 &&
   132			PCI_SLOT(devfn) > 0)
   133			return NULL;
   134	
   135		/* CFG0 can only access standard space */
   136		if (where < PCI_CFG_SPACE_SIZE && priv->cfg0_base)
   137			return cfg0_map(priv, busnum, devfn, where);
   138	
   139		/* CFG1 can access extended space */
   140		if (where < PCI_CFG_SPACE_EXP_SIZE && priv->cfg1_base)
   141			return cfg1_map(priv, busnum, devfn, where);
   142	
   143		return NULL;
   144	}
   145	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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