Re: [PATCH V8 5/6] arm64/perf: Add branch stack support in ARMV8 PMU

[kernel test robot <lkp@intel.com>]

Hi Anshuman,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on arm64/for-next/core]
[also build test WARNING on tip/perf/core acme/perf/core linus/master v6.2-rc6 next-20230130]
[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/drivers-perf-arm_pmu-Add-new-sched_task-callback/20230123-210254
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
patch link:    https://lore.kernel.org/r/20230123125956.1350336-6-anshuman.khandual%40arm.com
patch subject: [PATCH V8 5/6] arm64/perf: Add branch stack support in ARMV8 PMU
config: arm64-randconfig-r016-20230130 (https://download.01.org/0day-ci/archive/20230131/202301310047.b5iv9hM8-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 4196ca3278f78c6e19246e54ab0ecb364e37d66a)
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://github.com/intel-lab-lkp/linux/commit/0deba04ac45f8632b8579cb5cbf908b9f4428402
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Anshuman-Khandual/drivers-perf-arm_pmu-Add-new-sched_task-callback/20230123-210254
        git checkout 0deba04ac45f8632b8579cb5cbf908b9f4428402
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 prepare

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

All warnings (new ones prefixed by >>):

   In file included from arch/arm64/kernel/asm-offsets.c:15:
   In file included from include/linux/kvm_host.h:45:
   In file included from arch/arm64/include/asm/kvm_host.h:36:
   In file included from include/kvm/arm_pmu.h:11:
>> arch/arm64/include/asm/perf_event.h:280:20: warning: function 'has_branch_stack' has internal linkage but is not defined [-Wundefined-internal]
   static inline bool has_branch_stack(struct perf_event *event);
                      ^
   arch/arm64/include/asm/perf_event.h:284:16: note: used here
           WARN_ON_ONCE(!has_branch_stack(event));
                         ^
   1 warning generated.
--
   In file included from arch/arm64/kernel/asm-offsets.c:15:
   In file included from include/linux/kvm_host.h:45:
   In file included from arch/arm64/include/asm/kvm_host.h:36:
   In file included from include/kvm/arm_pmu.h:11:
>> arch/arm64/include/asm/perf_event.h:280:20: warning: function 'has_branch_stack' has internal linkage but is not defined [-Wundefined-internal]
   static inline bool has_branch_stack(struct perf_event *event);
                      ^
   arch/arm64/include/asm/perf_event.h:284:16: note: used here
           WARN_ON_ONCE(!has_branch_stack(event));
                         ^
   1 warning generated.


vim +/has_branch_stack +280 arch/arm64/include/asm/perf_event.h

   279	
 > 280	static inline bool has_branch_stack(struct perf_event *event);
   281	

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