[xlnx:xlnx_rebase_v5.4 842/1701] drivers/spi/spi-mem.c:18:6: warning: no previous prototype for function 'update_stripe'

[kernel test robot]

tree:   https://github.com/Xilinx/linux-xlnx xlnx_rebase_v5.4
head:   8540825db3d5519ef205a710515b7819b95eeb4f
commit: 3780469dd372e934445de2fbb5e8cf6e712b9b99 [842/1701] spi: Add Zynq QSPI controller driver
config: x86_64-randconfig-a004-20210401 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 1c268a8ff4e90a85d0e634350b1104080614cf2b)
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
        # https://github.com/Xilinx/linux-xlnx/commit/3780469dd372e934445de2fbb5e8cf6e712b9b99
        git remote add xlnx https://github.com/Xilinx/linux-xlnx
        git fetch --no-tags xlnx xlnx_rebase_v5.4
        git checkout 3780469dd372e934445de2fbb5e8cf6e712b9b99
        # 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: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

   In file included from drivers/spi/spi-mem.c:10:
   In file included from include/linux/mtd/spi-nor.h:10:
   include/linux/mtd/cfi.h:62:2: warning: No CONFIG_MTD_CFI_Ix selected. No NOR chip support can work. [-W#warnings]
   #warning No CONFIG_MTD_CFI_Ix selected. No NOR chip support can work.
    ^
>> drivers/spi/spi-mem.c:18:6: warning: no previous prototype for function 'update_stripe' [-Wmissing-prototypes]
   bool update_stripe(const u8 opcode)
        ^
   drivers/spi/spi-mem.c:18:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool update_stripe(const u8 opcode)
   ^
   static 
   2 warnings generated.


vim +/update_stripe +18 drivers/spi/spi-mem.c

    17	
  > 18	bool update_stripe(const u8 opcode)
    19	{
    20		if (opcode ==  SPINOR_OP_BE_4K ||
    21		    opcode ==  SPINOR_OP_BE_32K ||
    22		    opcode ==  SPINOR_OP_CHIP_ERASE ||
    23		    opcode ==  SPINOR_OP_SE ||
    24		    opcode ==  SPINOR_OP_BE_32K_4B ||
    25		    opcode ==  SPINOR_OP_SE_4B ||
    26		    opcode == SPINOR_OP_BE_4K_4B ||
    27		    opcode ==  SPINOR_OP_WRSR ||
    28		    opcode ==  SPINOR_OP_WREAR ||
    29		    opcode ==  SPINOR_OP_BRWR ||
    30		    opcode ==  SPINOR_OP_WRSR2)
    31			return false;
    32	
    33		return true;
    34	}
    35	

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