Hi Lucas, kernel test robot noticed the following build warnings: [auto build test WARNING on perf-tools-next/perf-tools-next] [cannot apply to tip/perf/core perf-tools/perf-tools acme/perf/core linus/master v6.12-rc2 next-20241008] [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/Lucas-De-Marchi/perf-Add-dummy-pmu-module/20241009-023728 base: https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git perf-tools-next patch link: https://lore.kernel.org/r/20241008183501.1354695-4-lucas.demarchi%40intel.com patch subject: [PATCH 3/5] perf: Add pmu get/put config: x86_64-kexec (https://download.01.org/0day-ci/archive/20241009/202410091848.aRUoRWWD-lkp@xxxxxxxxx/config) compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241009/202410091848.aRUoRWWD-lkp@xxxxxxxxx/reproduce) 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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202410091848.aRUoRWWD-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): >> kernel/events/core.c:5235:17: warning: unused variable 'module' [-Wunused-variable] 5235 | struct module *module; | ^~~~~~ 1 warning generated. vim +/module +5235 kernel/events/core.c 5232 5233 static void _free_event(struct perf_event *event) 5234 { > 5235 struct module *module; 5236 5237 irq_work_sync(&event->pending_irq); 5238 irq_work_sync(&event->pending_disable_irq); 5239 perf_pending_task_sync(event); 5240 5241 unaccount_event(event); 5242 5243 security_perf_event_free(event); 5244 5245 if (event->rb) { 5246 /* 5247 * Can happen when we close an event with re-directed output. 5248 * 5249 * Since we have a 0 refcount, perf_mmap_close() will skip 5250 * over us; possibly making our ring_buffer_put() the last. 5251 */ 5252 mutex_lock(&event->mmap_mutex); 5253 ring_buffer_attach(event, NULL); 5254 mutex_unlock(&event->mmap_mutex); 5255 } 5256 5257 if (is_cgroup_event(event)) 5258 perf_detach_cgroup(event); 5259 5260 if (!event->parent) { 5261 if (event->attr.sample_type & PERF_SAMPLE_CALLCHAIN) 5262 put_callchain_buffers(); 5263 } 5264 5265 perf_event_free_bpf_prog(event); 5266 perf_addr_filters_splice(event, NULL); 5267 kfree(event->addr_filter_ranges); 5268 5269 if (event->destroy) 5270 event->destroy(event); 5271 5272 /* 5273 * Must be after ->destroy(), due to uprobe_perf_close() using 5274 * hw.target. 5275 */ 5276 if (event->hw.target) 5277 put_task_struct(event->hw.target); 5278 5279 if (event->pmu_ctx) 5280 put_pmu_ctx(event->pmu_ctx); 5281 5282 /* 5283 * perf_event_free_task() relies on put_ctx() being 'last', in particular 5284 * all task references must be cleaned up. 5285 */ 5286 if (event->ctx) 5287 put_ctx(event->ctx); 5288 5289 exclusive_event_destroy(event); 5290 5291 pmu_module_put(&event->pmu); 5292 5293 call_rcu(&event->rcu_head, free_event_rcu); 5294 } 5295 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
