Hi Beau, Thank you for the patch! Yet something to improve: [auto build test ERROR on rostedt-trace/for-next] [also build test ERROR on shuah-kselftest/next linux/master linus/master v5.15 next-20211104] [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/Beau-Belgrave/user_events-Enable... base: https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git for-next config: powerpc-allmodconfig (attached as .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/0day-ci/linux/commit/da0961ad45aa1192b47b8a80de6b17437... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Beau-Belgrave/user_events-Enable-user-processes-to-create-and-write-to-trace-events/20211105-010650 git checkout da0961ad45aa1192b47b8a80de6b17437434ae4a # save the attached .config 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 kernel/trace/ 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/trace/trace_events_user.c: In function 'user_event_parse': 665 | dyn_event_add(&user->devent); | ^~~~~~~~~~~~~ In file included from kernel/trace/trace_events_user.c:23: kernel/trace/trace_dynevent.h:79:19: note: declared here 79 | static inline int dyn_event_add(struct dyn_event *ev, | ^~~~~~~~~~~~~ vim +/dyn_event_add +665 kernel/trace/trace_events_user.c 596 597 /* 598 * Parses the event name, arguments and flags then registers if successful. 599 */ 600 static int user_event_parse(char *name, char *args, char *flags, 601 struct user_event **newuser) 602 { 603 int ret; 604 int index; 605 u32 key; 606 struct user_event *user = find_user_event(name, &key); 607 608 if (user) { 609 *newuser = user; 610 ret = 0; 611 goto put_name; 612 } 613 614 index = find_first_zero_bit(page_bitmap, MAX_EVENTS); 615 616 if (index == MAX_EVENTS) { 617 ret = -EMFILE; 618 goto put_name; 619 } 620 621 user = kzalloc(sizeof(*user), GFP_KERNEL); 622 623 if (!user) { 624 ret = -ENOMEM; 625 goto put_name; 626 } 627 628 INIT_LIST_HEAD(&user->class.fields); 629 INIT_LIST_HEAD(&user->fields); 630 631 user->tracepoint.name = name; 632 633 user_event_parse_flags(user, flags); 634 635 ret = user_event_parse_fields(user, args); 636 637 if (ret) 638 goto put_user; 639 640 /* Minimal print format */ 641 user->call.print_fmt = "\"\""; 642 643 user->call.data = user; 644 user->call.class = &user->class; 645 user->call.name = name; 646 user->call.flags = TRACE_EVENT_FL_TRACEPOINT; 647 user->call.tp = &user->tracepoint; 648 user->call.event.funcs = &user_event_funcs; 649 650 user->class.system = USER_EVENTS_SYSTEM; 651 user->class.fields_array = user_event_fields_array; 652 user->class.get_fields = user_event_get_fields; 653 user->class.reg = user_event_reg; 654 user->class.probe = user_event_ftrace; 655 656 mutex_lock(&event_mutex); 657 ret = user_event_trace_register(user); 658 mutex_unlock(&event_mutex); 659 660 if (ret) 661 goto put_user; 662 663 user->index = index; 664 dyn_event_init(&user->devent, &user_event_dops); 666 set_bit(user->index, page_bitmap); 667 hash_add(register_table, &user->node, key); 668 669 *newuser = user; 670 return 0; 671 put_user: 672 user_event_destroy_fields(user); 673 kfree(user); 674 put_name: 675 kfree(name); 676 return ret; 677 } 678 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org