[atishp04:kvm_perf_rfc_snapshot 21/25] arch/riscv/kvm/vcpu_sbi_pmu.c:66:15: warning: no previous prototype for function 'kvm_sbi_ext_pmu_probe'

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

tree:   https://github.com/atishp04/linux kvm_perf_rfc_snapshot
head:   42182a0a79a8768e22fd70232c3aca2bc1a26a43
commit: 657de0362946d389f50e8b65f72da5f5ba0be1da [21/25] RISC-V: KVM: Add SBI PMU extension support
config: riscv-rv32_defconfig (https://download.01.org/0day-ci/archive/20220731/202207310426.hXMc5CaM-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 52cd00cabf479aa7eb6dbb063b7ba41ea57bce9e)
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-riscv-linux-gnu
        # https://github.com/atishp04/linux/commit/657de0362946d389f50e8b65f72da5f5ba0be1da
        git remote add atishp04 https://github.com/atishp04/linux
        git fetch --no-tags atishp04 kvm_perf_rfc_snapshot
        git checkout 657de0362946d389f50e8b65f72da5f5ba0be1da
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/kvm/

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 >>):

>> arch/riscv/kvm/vcpu_sbi_pmu.c:66:15: warning: no previous prototype for function 'kvm_sbi_ext_pmu_probe' [-Wmissing-prototypes]
   unsigned long kvm_sbi_ext_pmu_probe(unsigned long extid)
                 ^
   arch/riscv/kvm/vcpu_sbi_pmu.c:66:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   unsigned long kvm_sbi_ext_pmu_probe(unsigned long extid)
   ^
   static 
   1 warning generated.


vim +/kvm_sbi_ext_pmu_probe +66 arch/riscv/kvm/vcpu_sbi_pmu.c

    65	
  > 66	unsigned long kvm_sbi_ext_pmu_probe(unsigned long extid)
    67	{
    68		/*
    69		 * PMU Extension is only available to guests if privilege mode filtering
    70		 * is available. Otherwise, guest will always count events while the
    71		 * execution is in hypervisor mode.
    72		 */
    73		return riscv_isa_extension_available(NULL, SSCOFPMF);
    74	}
    75	

-- 
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https://01.org/lkp