Hi Anshuman, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on acme/perf/core] [also build test WARNING on tip/perf/core arm64/for-next/core linus/master v6.0-rc4 next-20220908] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Anshuman-Khandual/arm64-perf-Enable-branch-stack-sampling/20220908-131425 base: https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git perf/core config: arm-spitz_defconfig compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 1546df49f5a6d09df78f569e4137ddb365a3e827) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/intel-lab-lkp/linux/commit/d3c4ba711027d312a2f4e16cdbdbec5fcbf2913b git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Anshuman-Khandual/arm64-perf-Enable-branch-stack-sampling/20220908-131425 git checkout d3c4ba711027d312a2f4e16cdbdbec5fcbf2913b # 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=arm SHELL=/bin/bash drivers/perf/ If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> drivers/perf/arm_pmu.c:498:12: warning: stack frame size (1760) exceeds limit (1024) in 'armpmu_event_init' [-Wframe-larger-than] static int armpmu_event_init(struct perf_event *event) ^ 1 warning generated. vim +/armpmu_event_init +498 drivers/perf/arm_pmu.c 1b8873a0c6ec51 arch/arm/kernel/perf_event.c Jamie Iles 2010-02-02 497 b0a873ebbf87bf arch/arm/kernel/perf_event.c Peter Zijlstra 2010-06-11 @498 static int armpmu_event_init(struct perf_event *event) 1b8873a0c6ec51 arch/arm/kernel/perf_event.c Jamie Iles 2010-02-02 499 { 8a16b34e21199e arch/arm/kernel/perf_event.c Mark Rutland 2011-04-28 500 struct arm_pmu *armpmu = to_arm_pmu(event->pmu); 1b8873a0c6ec51 arch/arm/kernel/perf_event.c Jamie Iles 2010-02-02 501 cc88116da0d18b arch/arm/kernel/perf_event.c Mark Rutland 2015-05-13 502 /* cc88116da0d18b arch/arm/kernel/perf_event.c Mark Rutland 2015-05-13 503 * Reject CPU-affine events for CPUs that are of a different class to cc88116da0d18b arch/arm/kernel/perf_event.c Mark Rutland 2015-05-13 504 * that which this PMU handles. Process-following events (where cc88116da0d18b arch/arm/kernel/perf_event.c Mark Rutland 2015-05-13 505 * event->cpu == -1) can be migrated between CPUs, and thus we have to cc88116da0d18b arch/arm/kernel/perf_event.c Mark Rutland 2015-05-13 506 * reject them later (in armpmu_add) if they're scheduled on a cc88116da0d18b arch/arm/kernel/perf_event.c Mark Rutland 2015-05-13 507 * different class of CPU. cc88116da0d18b arch/arm/kernel/perf_event.c Mark Rutland 2015-05-13 508 */ cc88116da0d18b arch/arm/kernel/perf_event.c Mark Rutland 2015-05-13 509 if (event->cpu != -1 && cc88116da0d18b arch/arm/kernel/perf_event.c Mark Rutland 2015-05-13 510 !cpumask_test_cpu(event->cpu, &armpmu->supported_cpus)) cc88116da0d18b arch/arm/kernel/perf_event.c Mark Rutland 2015-05-13 511 return -ENOENT; cc88116da0d18b arch/arm/kernel/perf_event.c Mark Rutland 2015-05-13 512 2481c5fa6db023 arch/arm/kernel/perf_event.c Stephane Eranian 2012-02-09 513 /* does not support taken branch sampling */ 2481c5fa6db023 arch/arm/kernel/perf_event.c Stephane Eranian 2012-02-09 514 if (has_branch_stack(event)) 2481c5fa6db023 arch/arm/kernel/perf_event.c Stephane Eranian 2012-02-09 515 return -EOPNOTSUPP; 2481c5fa6db023 arch/arm/kernel/perf_event.c Stephane Eranian 2012-02-09 516 e1f431b57ef9e4 arch/arm/kernel/perf_event.c Mark Rutland 2011-04-28 517 if (armpmu->map_event(event) == -ENOENT) b0a873ebbf87bf arch/arm/kernel/perf_event.c Peter Zijlstra 2010-06-11 518 return -ENOENT; b0a873ebbf87bf arch/arm/kernel/perf_event.c Peter Zijlstra 2010-06-11 519 c09adab01e4aee drivers/perf/arm_pmu.c Mark Rutland 2017-03-10 520 return __hw_perf_event_init(event); 1b8873a0c6ec51 arch/arm/kernel/perf_event.c Jamie Iles 2010-02-02 521 } 1b8873a0c6ec51 arch/arm/kernel/perf_event.c Jamie Iles 2010-02-02 522 -- 0-DAY CI Kernel Test Service https://01.org/lkp