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Subject[linuxppc:next-test 126/140] arch/powerpc/perf/core-book3s.c:2455:6: warning: no previous prototype for 'power_pmu_wants_prompt_pmi'
tree:   https://github.com/linuxppc/linux next-test
head: 9c4c79c450672b18889a42e6b16a0254ed9721e0
commit: 5a7745b96f43c69f9b4875bcf516a0341acbc3fb [126/140] powerpc/64s/perf: add power_pmu_wants_prompt_pmi to say whether perf wants PMIs to be soft-NMI
config: powerpc-allyesconfig (https://download.01.org/0day-ci/archive/20211222/202112220137.X16y07Dp-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 11.2.0
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://github.com/linuxppc/linux/commit/5a7745b96f43c69f9b4875bcf516a0341acbc3fb
git remote add linuxppc https://github.com/linuxppc/linux
git fetch --no-tags linuxppc next-test
git checkout 5a7745b96f43c69f9b4875bcf516a0341acbc3fb
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/perf/

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

All warnings (new ones prefixed by >>):

>> arch/powerpc/perf/core-book3s.c:2455:6: warning: no previous prototype for 'power_pmu_wants_prompt_pmi' [-Wmissing-prototypes]
2455 | bool power_pmu_wants_prompt_pmi(void)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/power_pmu_wants_prompt_pmi +2455 arch/powerpc/perf/core-book3s.c

2440
2441 /*
2442 * If the perf subsystem wants performance monitor interrupts as soon as
2443 * possible (e.g., to sample the instruction address and stack chain),
2444 * this should return true. The IRQ masking code can then enable MSR[EE]
2445 * in some places (e.g., interrupt handlers) that allows PMI interrupts
2446 * though to improve accuracy of profiles, at the cost of some performance.
2447 *
2448 * The PMU counters can be enabled by other means (e.g., sysfs raw SPR
2449 * access), but in that case there is no need for prompt PMI handling.
2450 *
2451 * This currently returns true if any perf counter is being used. It
2452 * could possibly return false if only events are being counted rather than
2453 * samples being taken, but for now this is good enough.
2454 */
> 2455 bool power_pmu_wants_prompt_pmi(void)
2456 {
2457 struct cpu_hw_events *cpuhw;
2458
2459 /*
2460 * This could simply test local_paca->pmcregs_in_use if that were not
2461 * under ifdef KVM.
2462 */
2463
2464 if (!ppmu)
2465 return false;
2466
2467 cpuhw = this_cpu_ptr(&cpu_hw_events);
2468 return cpuhw->n_events;
2469 }
2470

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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