Hi Namhyung, I love your patch! Yet something to improve: [auto build test ERROR on tip/perf/core] [also build test ERROR on tip/master linux/master linus/master v5.16-rc4] [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] url: https://github.com/0day-ci/linux/commits/Namhyung-Kim/perf-core-Fix-cgrou... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git a9f4a6e92b3b319296fb078da2615f618f6cd80c config: csky-randconfig-r012-20211210 (https://download.01.org/0day-ci/archive/20211211/202112111040.jKqB3uu1-lk...) compiler: csky-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/0day-ci/linux/commit/226bdbf0501464bc088d582c02d0495a6... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Namhyung-Kim/perf-core-Fix-cgroup-event-list-management/20211211-080810 git checkout 226bdbf0501464bc088d582c02d0495a61a68b7c # 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=csky SHELL=/bin/bash kernel/events/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): kernel/events/core.c: In function 'perf_remove_from_context': 2391 | if (!ctx->is_active && (!is_cgroup_event(event) || ctx->nr_cgroups > 1)) { | ^~ kernel/events/core.c: In function 'perf_install_in_context': kernel/events/core.c:2867:35: error: 'struct perf_event_context' has no member named 'nr_cgroups' 2867 | ctx->nr_events && (ctx->nr_cgroups || !is_cgroup_event(event))) { | ^~ vim +2391 kernel/events/core.c 2368 2369 /* 2370 * Remove the event from a task's (or a CPU's) list of events. 2371 * 2372 * If event->ctx is a cloned context, callers must make sure that 2373 * every task struct that event->ctx->task could possibly point to 2374 * remains valid. This is OK when called from perf_release since 2375 * that only calls us on the top-level context, which can't be a clone. 2376 * When called from perf_event_exit_task, it's OK because the 2377 * context has been detached from its task. 2378 */ 2379 static void perf_remove_from_context(struct perf_event *event, unsigned long flags) 2380 { 2381 struct perf_event_context *ctx = event->ctx; 2382 2383 lockdep_assert_held(&ctx->mutex); 2384 2385 /* 2386 * Because of perf_event_exit_task(), perf_remove_from_context() ought 2387 * to work in the face of TASK_TOMBSTONE, unlike every other 2388 * event_function_call() user. 2389 */ 2390 raw_spin_lock_irq(&ctx->lock); 2392 __perf_remove_from_context(event, __get_cpu_context(ctx), 2393 ctx, (void *)flags); 2394 raw_spin_unlock_irq(&ctx->lock); 2395 return; 2396 } 2397 raw_spin_unlock_irq(&ctx->lock); 2398 2399 event_function_call(event, __perf_remove_from_context, (void *)flags); 2400 } 2401 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org