Hi Sean, I love your patch! Perhaps something to improve: [auto build test WARNING on 372d07084593dc7a399bf9bee815711b1fb1bcf2] url: https://github.com/intel-lab-lkp/linux/commits/Sean-Christopherson/KVM-x86-Intel-LBR-related-perf-cleanups/20220902-013352 base: 372d07084593dc7a399bf9bee815711b1fb1bcf2 config: i386-randconfig-m021 (https://download.01.org/0day-ci/archive/20220902/202209021042.UcDPO3lL-lkp@xxxxxxxxx/config) compiler: gcc-11 (Debian 11.3.0-5) 11.3.0 reproduce (this is a W=1 build): # https://github.com/intel-lab-lkp/linux/commit/b1f1d2f5eb44253f5d059757c03e7fd413b2e306 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Sean-Christopherson/KVM-x86-Intel-LBR-related-perf-cleanups/20220902-013352 git checkout b1f1d2f5eb44253f5d059757c03e7fd413b2e306 # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/events/ 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/x86/events/core.c:696:31: warning: no previous prototype for 'perf_guest_get_msrs' [-Wmissing-prototypes] 696 | struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr, void *data) | ^~~~~~~~~~~~~~~~~~~ vim +/perf_guest_get_msrs +696 arch/x86/events/core.c f87ad35d37fa54 arch/x86/kernel/cpu/perf_counter.c Jaswinder Singh Rajput 2009-02-27 695 39a4d779546a99 arch/x86/events/core.c Like Xu 2022-04-11 @696 struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr, void *data) abd562df94d19d arch/x86/events/core.c Like Xu 2021-01-25 697 { 39a4d779546a99 arch/x86/events/core.c Like Xu 2022-04-11 698 return static_call(x86_pmu_guest_get_msrs)(nr, data); abd562df94d19d arch/x86/events/core.c Like Xu 2021-01-25 699 } abd562df94d19d arch/x86/events/core.c Like Xu 2021-01-25 700 EXPORT_SYMBOL_GPL(perf_guest_get_msrs); abd562df94d19d arch/x86/events/core.c Like Xu 2021-01-25 701 -- 0-DAY CI Kernel Test Service https://01.org/lkp
