arch/powerpc/kvm/e500mc.c:171:5: error: no previous prototype for 'kvmppc_e500mc_check_processor_compat'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   2eb29d59ddf02e39774abfb60b2030b0b7e27c1f
commit: 7cb79f433e75b05d1635aefaa851cfcd1cb7dc4f KVM: PPC: Fix refactoring goof in kvmppc_e500mc_init()
date:   5 weeks ago
config: powerpc-randconfig-r001-20230302 (https://download.01.org/0day-ci/archive/20230303/202303031630.ntvIuYqo-lkp@xxxxxxxxx/config)
compiler: powerpc-linux-gcc (GCC) 12.1.0
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7cb79f433e75b05d1635aefaa851cfcd1cb7dc4f
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 7cb79f433e75b05d1635aefaa851cfcd1cb7dc4f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202303031630.ntvIuYqo-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

>> arch/powerpc/kvm/e500mc.c:171:5: error: no previous prototype for 'kvmppc_e500mc_check_processor_compat' [-Werror=missing-prototypes]
     171 | int kvmppc_e500mc_check_processor_compat(void)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors


vim +/kvmppc_e500mc_check_processor_compat +171 arch/powerpc/kvm/e500mc.c

   170	
 > 171	int kvmppc_e500mc_check_processor_compat(void)
   172	{
   173		int r;
   174	
   175		if (strcmp(cur_cpu_spec->cpu_name, "e500mc") == 0)
   176			r = 0;
   177		else if (strcmp(cur_cpu_spec->cpu_name, "e5500") == 0)
   178			r = 0;
   179	#ifdef CONFIG_ALTIVEC
   180		/*
   181		 * Since guests have the privilege to enable AltiVec, we need AltiVec
   182		 * support in the host to save/restore their context.
   183		 * Don't use CPU_FTR_ALTIVEC to identify cores with AltiVec unit
   184		 * because it's cleared in the absence of CONFIG_ALTIVEC!
   185		 */
   186		else if (strcmp(cur_cpu_spec->cpu_name, "e6500") == 0)
   187			r = 0;
   188	#endif
   189		else
   190			r = -ENOTSUPP;
   191	
   192		return r;
   193	}
   194	

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