[jirislaby:lto 40/48] arch/x86/events/amd/core.c:696:23: warning: no previous prototype for 'amd_pmu_test_overflow_topbit'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git lto
head:   b5ee1c28376713353cb5355716949d9c6d9b416b
commit: 37d6f8c7840982bb452f8bb411fba6a7f4f0e8e9 [40/48] cpufreq, amd-pstate, lto: Fix for gcc LTO
config: i386-defconfig (https://download.01.org/0day-ci/archive/20220627/202206271846.ABXxrU2T-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git/commit/?id=37d6f8c7840982bb452f8bb411fba6a7f4f0e8e9
        git remote add jirislaby https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git
        git fetch --no-tags jirislaby lto
        git checkout 37d6f8c7840982bb452f8bb411fba6a7f4f0e8e9
        # 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/amd/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <yujie.liu@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> arch/x86/events/amd/core.c:696:23: warning: no previous prototype for 'amd_pmu_test_overflow_topbit' [-Wmissing-prototypes]
     696 | __visible_on_lto bool amd_pmu_test_overflow_topbit(int idx)
         |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/amd_pmu_test_overflow_topbit +696 arch/x86/events/amd/core.c

7685665c390dc6 Sandipan Das 2022-04-21  695
37d6f8c7840982 Andi Kleen   2022-02-18 @696  __visible_on_lto bool amd_pmu_test_overflow_topbit(int idx)
7685665c390dc6 Sandipan Das 2022-04-21  697  {
7685665c390dc6 Sandipan Das 2022-04-21  698  	u64 counter;
7685665c390dc6 Sandipan Das 2022-04-21  699
7685665c390dc6 Sandipan Das 2022-04-21  700  	rdmsrl(x86_pmu_event_addr(idx), counter);
7685665c390dc6 Sandipan Das 2022-04-21  701
7685665c390dc6 Sandipan Das 2022-04-21  702  	return !(counter & BIT_ULL(x86_pmu.cntval_bits - 1));
7685665c390dc6 Sandipan Das 2022-04-21  703  }
7685665c390dc6 Sandipan Das 2022-04-21  704

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