tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git perf/urgent head: 27597c782ca7cbf37a58156790e41e028449b1ba commit: d5ef92d792772af29345ab933bf1eb22a014870f [2/8] perf/arch: Remove perf_sample_data::regs_user_copy config: nds32-randconfig-r011-20201030 (attached as .config) compiler: nds32le-linux-gcc (GCC) 9.3.0 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/peterz/queue.git/commit/?... git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git git fetch --no-tags peterz-queue perf/urgent git checkout d5ef92d792772af29345ab933bf1eb22a014870f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nds32 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from include/linux/perf_event.h:56, from include/linux/trace_events.h:10, from include/trace/syscall.h:7, from include/linux/syscalls.h:84, from kernel/events/core.c:34: include/linux/perf_regs.h:45:1: error: expected identifier or '(' before '{' token 45 | { | ^ kernel/events/core.c:6534:6: warning: no previous prototype for 'perf_pmu_snapshot_aux' [-Wmissing-prototypes] 6534 | long perf_pmu_snapshot_aux(struct perf_buffer *rb, | ^~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/perf_event.h:56, from include/linux/trace_events.h:10, from include/trace/syscall.h:7, from include/linux/syscalls.h:84, from kernel/events/core.c:34: 43 | static inline void perf_get_regs_user(struct perf_regs *regs_user, | ^~~~~~~~~~~~~~~~~~ vim +/perf_get_regs_user +43 include/linux/perf_regs.h 88a7c26af8dab2f Andy Lutomirski 2015-01-04 42 88a7c26af8dab2f Andy Lutomirski 2015-01-04 @43 static inline void perf_get_regs_user(struct perf_regs *regs_user, :::::: The code at line 43 was first introduced by commit :::::: 88a7c26af8dab2f2d69f5a6067eb670694ec38c0 perf: Move task_pt_regs sampling into arch code :::::: TO: Andy Lutomirski <luto(a)amacapital.net&gt; :::::: CC: Ingo Molnar <mingo(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org