tree: https://gitee.com/openeuler/kernel.git OLK-5.10 head: b5ec139da1a4916dfc9644ee3d9426dbd6f23c13 commit: 600130a3b3f73d76dbfa38d63f68d1c2520e582d [2882/2882] kabi: Fix kabi breakage without build warning. config: x86_64-buildonly-randconfig-2003-20250502 (https://download.01.org/0day-ci/archive/20250604/202506040948.XIX3UmG8-lkp@i...) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250604/202506040948.XIX3UmG8-lkp@i...) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202506040948.XIX3UmG8-lkp@intel.com/ All warnings (new ones prefixed by >>):

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arch/x86/events/amd/brs.c:339:6: warning: no previous prototype for 'perf_amd_brs_lopwr_cb' [-Wmissing-prototypes] 339 | void perf_amd_brs_lopwr_cb(bool lopwr_in) | ^~~~~~~~~~~~~~~~~~~~~

vim +/perf_amd_brs_lopwr_cb +339 arch/x86/events/amd/brs.c fb5f22f8054df9 Stephane Eranian 2022-03-22 334 fb5f22f8054df9 Stephane Eranian 2022-03-22 335 /* fb5f22f8054df9 Stephane Eranian 2022-03-22 336 * called from ACPI processor_idle.c or acpi_pad.c fb5f22f8054df9 Stephane Eranian 2022-03-22 337 * with interrupts disabled fb5f22f8054df9 Stephane Eranian 2022-03-22 338 */ fb5f22f8054df9 Stephane Eranian 2022-03-22 @339 void perf_amd_brs_lopwr_cb(bool lopwr_in) fb5f22f8054df9 Stephane Eranian 2022-03-22 340 { fb5f22f8054df9 Stephane Eranian 2022-03-22 341 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); fb5f22f8054df9 Stephane Eranian 2022-03-22 342 union amd_debug_extn_cfg cfg; fb5f22f8054df9 Stephane Eranian 2022-03-22 343 fb5f22f8054df9 Stephane Eranian 2022-03-22 344 /* fb5f22f8054df9 Stephane Eranian 2022-03-22 345 * on mwait in, we may end up in non C0 state. fb5f22f8054df9 Stephane Eranian 2022-03-22 346 * we must disable branch sampling to avoid holding the NMI fb5f22f8054df9 Stephane Eranian 2022-03-22 347 * for too long. We disable it in hardware but we fb5f22f8054df9 Stephane Eranian 2022-03-22 348 * keep the state in cpuc, so we can re-enable. fb5f22f8054df9 Stephane Eranian 2022-03-22 349 * fb5f22f8054df9 Stephane Eranian 2022-03-22 350 * The hardware will deliver the NMI if needed when brsmen cleared fb5f22f8054df9 Stephane Eranian 2022-03-22 351 */ fb5f22f8054df9 Stephane Eranian 2022-03-22 352 if (cpuc->brs_active) { fb5f22f8054df9 Stephane Eranian 2022-03-22 353 cfg.val = get_debug_extn_cfg(); fb5f22f8054df9 Stephane Eranian 2022-03-22 354 cfg.brsmen = !lopwr_in; fb5f22f8054df9 Stephane Eranian 2022-03-22 355 set_debug_extn_cfg(cfg.val); fb5f22f8054df9 Stephane Eranian 2022-03-22 356 } fb5f22f8054df9 Stephane Eranian 2022-03-22 357 } fb5f22f8054df9 Stephane Eranian 2022-03-22 358 :::::: The code at line 339 was first introduced by commit :::::: fb5f22f8054df9c6cc2c2e40e54a76ea62fb4824 perf/x86/amd: Add idle hooks for branch sampling :::::: TO: Stephane Eranian <eranian@google.com> :::::: CC: Xie Haocheng <haocheng.xie@amd.com> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki