[atishp04:sbi_pmu_v1 11/14] drivers/perf/riscv_pmu.c:36:15: warning: no previous prototype for function 'csr_read_num'

[atishp04:sbi_pmu_v1 11/14] drivers/perf/riscv_pmu.c:36:15: warning: no previous prototype for function 'csr_read_num'

[kernel test robot]

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tree:   https://github.com/atishp04/linux sbi_pmu_v1
head:   d82bc37d5a962b33af712da468a82d2ced9eb194
commit: 5009c84a60b998b44c7c8481984b5553bfc0986c [11/14] RISC-V: Add a perf platform driver
config: riscv-randconfig-r001-20210318 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project fcc1ce00931751ac02498986feb37744e9ace8de)
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 riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/atishp04/linux/commit/5009c84a60b998b44c7c8481984b5553bfc0986c
        git remote add atishp04 https://github.com/atishp04/linux
        git fetch --no-tags atishp04 sbi_pmu_v1
        git checkout 5009c84a60b998b44c7c8481984b5553bfc0986c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv 

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

All warnings (new ones prefixed by >>):

>> drivers/perf/riscv_pmu.c:36:15: warning: no previous prototype for function 'csr_read_num' [-Wmissing-prototypes]
   unsigned long csr_read_num(int csr_num)
                 ^
   drivers/perf/riscv_pmu.c:36:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   unsigned long csr_read_num(int csr_num)
   ^
   static 
   1 warning generated.


vim +/csr_read_num +36 drivers/perf/riscv_pmu.c

    35	
  > 36	unsigned long csr_read_num(int csr_num)
    37	{
    38	#define switchcase_csr_read(__csr_num, __val)		{\
    39		case __csr_num:					\
    40			__val = csr_read(__csr_num);		\
    41			break; }
    42	#define switchcase_csr_read_2(__csr_num, __val)		{\
    43		switchcase_csr_read(__csr_num + 0, __val)	 \
    44		switchcase_csr_read(__csr_num + 1, __val)}
    45	#define switchcase_csr_read_4(__csr_num, __val)		{\
    46		switchcase_csr_read_2(__csr_num + 0, __val)	 \
    47		switchcase_csr_read_2(__csr_num + 2, __val)}
    48	#define switchcase_csr_read_8(__csr_num, __val)		{\
    49		switchcase_csr_read_4(__csr_num + 0, __val)	 \
    50		switchcase_csr_read_4(__csr_num + 4, __val)}
    51	#define switchcase_csr_read_16(__csr_num, __val)	{\
    52		switchcase_csr_read_8(__csr_num + 0, __val)	 \
    53		switchcase_csr_read_8(__csr_num + 8, __val)}
    54	#define switchcase_csr_read_32(__csr_num, __val)	{\
    55		switchcase_csr_read_16(__csr_num + 0, __val)	 \
    56		switchcase_csr_read_16(__csr_num + 16, __val)}
    57	
    58		unsigned long ret = 0;
    59	
    60		switch (csr_num) {
    61		switchcase_csr_read_32(CSR_CYCLE, ret)
    62		switchcase_csr_read_32(CSR_CYCLEH, ret)
    63		default :
    64			break;
    65		};
    66	
    67		return ret;
    68	

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

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