arch/arm64/kvm/hyp/nvhe/stacktrace.c:46:6: warning: no previous prototype for function 'kvm_nvhe_prepare_backtrace'

[kernel test robot]

Hi Kalesh,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   15205c2829ca2cbb5ece5ceaafe1171a8470e62b
commit: 879e5ac7b2e4db05799a905b5a07fc9e5dedf651 KVM: arm64: Prepare non-protected nVHE hypervisor stacktrace
date:   2 weeks ago
config: arm64-randconfig-r034-20220810 (https://download.01.org/0day-ci/archive/20220810/202208100837.3PuoDcEv-lkp@xxxxxxxxx/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 5f1c7e2cc5a3c07cbc2412e851a7283c1841f520)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=879e5ac7b2e4db05799a905b5a07fc9e5dedf651
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 879e5ac7b2e4db05799a905b5a07fc9e5dedf651
        # 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=arm64 SHELL=/bin/bash arch/arm64/kvm/hyp/nvhe/ drivers/vfio/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> arch/arm64/kvm/hyp/nvhe/stacktrace.c:46:6: warning: no previous prototype for function 'kvm_nvhe_prepare_backtrace' [-Wmissing-prototypes]
   void kvm_nvhe_prepare_backtrace(unsigned long fp, unsigned long pc)
        ^
   arch/arm64/kvm/hyp/nvhe/stacktrace.c:46:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void kvm_nvhe_prepare_backtrace(unsigned long fp, unsigned long pc)
   ^
   static 
   1 warning generated.


vim +/kvm_nvhe_prepare_backtrace +46 arch/arm64/kvm/hyp/nvhe/stacktrace.c

    36	
    37	/*
    38	 * kvm_nvhe_prepare_backtrace - prepare to dump the nVHE backtrace
    39	 *
    40	 * @fp : frame pointer at which to start the unwinding.
    41	 * @pc : program counter at which to start the unwinding.
    42	 *
    43	 * Saves the information needed by the host to dump the nVHE hypervisor
    44	 * backtrace.
    45	 */
  > 46	void kvm_nvhe_prepare_backtrace(unsigned long fp, unsigned long pc)

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https://01.org/lkp