Hi Jakub, I love your patch! Perhaps something to improve: [auto build test WARNING on bpf-next/master] url: https://github.com/0day-ci/linux/commits/Jakub-Kicinski/bpf-remove-the-cg... base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20211216/202112160753.yRz2i2rn-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/4dc3a2bcf4720df1766ff9dc2bcbf14b3... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Jakub-Kicinski/bpf-remove-the-cgroup-bpf-header-dependecy/20211216-021426 git checkout 4dc3a2bcf4720df1766ff9dc2bcbf14b3f221a31 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from include/linux/trace_events.h:10, from include/trace/syscall.h:7, from include/linux/syscalls.h:88, from init/main.c:21: 1499 | static inline void perf_event_bpf_event(struct bpf_prog *prog, | ^~~~~~~~ init/main.c:768:20: warning: no previous prototype for 'arch_post_acpi_subsys_init' [-Wmissing-prototypes] 768 | void __init __weak arch_post_acpi_subsys_init(void) { } | ^~~~~~~~~~~~~~~~~~~~~~~~~~ init/main.c:780:20: warning: no previous prototype for 'mem_encrypt_init' [-Wmissing-prototypes] 780 | void __init __weak mem_encrypt_init(void) { } | ^~~~~~~~~~~~~~~~ init/main.c:782:20: warning: no previous prototype for 'poking_init' [-Wmissing-prototypes] 782 | void __init __weak poking_init(void) { } | ^~~~~~~~~~~ -- In file included from include/linux/trace_events.h:10, from include/trace/syscall.h:7, from include/linux/syscalls.h:88, from init/noinitramfs.c:11: 1499 | static inline void perf_event_bpf_event(struct bpf_prog *prog, | ^~~~~~~~ -- In file included from include/linux/trace_events.h:10, from include/trace/syscall.h:7, from include/linux/syscalls.h:88, from arch/um/kernel/syscall.c:11: 1499 | static inline void perf_event_bpf_event(struct bpf_prog *prog, | ^~~~~~~~ arch/um/kernel/syscall.c:17:6: warning: no previous prototype for 'old_mmap' [-Wmissing-prototypes] 17 | long old_mmap(unsigned long addr, unsigned long len, | ^~~~~~~~ -- In file included from include/linux/trace_events.h:10, from include/trace/syscall.h:7, from include/linux/syscalls.h:88, from arch/x86/um/tls_32.c:8: 1499 | static inline void perf_event_bpf_event(struct bpf_prog *prog, | ^~~~~~~~ arch/x86/um/tls_32.c:23:5: warning: no previous prototype for 'do_set_thread_area' [-Wmissing-prototypes] 23 | int do_set_thread_area(struct user_desc *info) | ^~~~~~~~~~~~~~~~~~ arch/x86/um/tls_32.c:39:5: warning: no previous prototype for 'do_get_thread_area' [-Wmissing-prototypes] 39 | int do_get_thread_area(struct user_desc *info) | ^~~~~~~~~~~~~~~~~~ arch/x86/um/tls_32.c:187:5: warning: no previous prototype for 'arch_switch_tls' [-Wmissing-prototypes] 187 | int arch_switch_tls(struct task_struct *to) | ^~~~~~~~~~~~~~~ -- In file included from include/linux/trace_events.h:10, from include/trace/syscall.h:7, from include/linux/syscalls.h:88, from kernel/fork.c:54: 1499 | static inline void perf_event_bpf_event(struct bpf_prog *prog, | ^~~~~~~~ kernel/fork.c:161:13: warning: no previous prototype for 'arch_release_task_struct' [-Wmissing-prototypes] 161 | void __weak arch_release_task_struct(struct task_struct *tsk) | ^~~~~~~~~~~~~~~~~~~~~~~~ kernel/fork.c:763:20: warning: no previous prototype for 'arch_task_cache_init' [-Wmissing-prototypes] 763 | void __init __weak arch_task_cache_init(void) { } | ^~~~~~~~~~~~~~~~~~~~ kernel/fork.c:858:12: warning: no previous prototype for 'arch_dup_task_struct' [-Wmissing-prototypes] 858 | int __weak arch_dup_task_struct(struct task_struct *dst, | ^~~~~~~~~~~~~~~~~~~~ -- In file included from include/linux/trace_events.h:10, from include/trace/syscall.h:7, from include/linux/syscalls.h:88, from kernel/exit.c:42: 1499 | static inline void perf_event_bpf_event(struct bpf_prog *prog, | ^~~~~~~~ kernel/exit.c:1817:13: warning: no previous prototype for 'abort' [-Wmissing-prototypes] 1817 | __weak void abort(void) | ^~~~~ -- In file included from include/linux/trace_events.h:10, from include/trace/syscall.h:7, from include/linux/syscalls.h:88, from fs/pipe.c:24: 1499 | static inline void perf_event_bpf_event(struct bpf_prog *prog, | ^~~~~~~~ fs/pipe.c:755:15: warning: no previous prototype for 'account_pipe_buffers' [-Wmissing-prototypes] 755 | unsigned long account_pipe_buffers(struct user_struct *user, | ^~~~~~~~~~~~~~~~~~~~ fs/pipe.c:761:6: warning: no previous prototype for 'too_many_pipe_buffers_soft' [-Wmissing-prototypes] 761 | bool too_many_pipe_buffers_soft(unsigned long user_bufs) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ fs/pipe.c:768:6: warning: no previous prototype for 'too_many_pipe_buffers_hard' [-Wmissing-prototypes] 768 | bool too_many_pipe_buffers_hard(unsigned long user_bufs) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ fs/pipe.c:775:6: warning: no previous prototype for 'pipe_is_unprivileged_user' [-Wmissing-prototypes] 775 | bool pipe_is_unprivileged_user(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~ fs/pipe.c:1245:5: warning: no previous prototype for 'pipe_resize_ring' [-Wmissing-prototypes] 1245 | int pipe_resize_ring(struct pipe_inode_info *pipe, unsigned int nr_slots) | ^~~~~~~~~~~~~~~~ -- In file included from include/linux/trace_events.h:10, from include/trace/syscall.h:7, from include/linux/syscalls.h:88, from fs/d_path.c:2: 1499 | static inline void perf_event_bpf_event(struct bpf_prog *prog, | ^~~~~~~~ fs/d_path.c:318:7: warning: no previous prototype for 'simple_dname' [-Wmissing-prototypes] 318 | char *simple_dname(struct dentry *dentry, char *buffer, int buflen) | ^~~~~~~~~~~~ -- In file included from include/linux/trace_events.h:10, from include/trace/syscall.h:7, from include/linux/syscalls.h:88, from fs/io_uring.c:45: 1499 | static inline void perf_event_bpf_event(struct bpf_prog *prog, | ^~~~~~~~ fs/io_uring.c: In function '__io_submit_flush_completions': fs/io_uring.c:2403:33: warning: variable 'prev' set but not used [-Wunused-but-set-variable] 2403 | struct io_wq_work_node *node, *prev; | ^~~~ -- In file included from include/linux/trace_events.h:10, from include/trace/syscall.h:7, from include/linux/syscalls.h:88, from kernel/time/timer.c:35: 1499 | static inline void perf_event_bpf_event(struct bpf_prog *prog, | ^~~~~~~~ kernel/time/timer.c:254:5: warning: no previous prototype for 'timer_migration_handler' [-Wmissing-prototypes] 254 | int timer_migration_handler(struct ctl_table *table, int write, | ^~~~~~~~~~~~~~~~~~~~~~~ -- In file included from include/linux/trace_events.h:10, from include/trace/syscall.h:7, from include/linux/syscalls.h:88, from kernel/time/hrtimer.c:30: 1499 | static inline void perf_event_bpf_event(struct bpf_prog *prog, | ^~~~~~~~ kernel/time/hrtimer.c:120:21: warning: initialized field overwritten [-Woverride-init] 120 | [CLOCK_REALTIME] = HRTIMER_BASE_REALTIME, | ^~~~~~~~~~~~~~~~~~~~~ kernel/time/hrtimer.c:120:21: note: (near initialization for 'hrtimer_clock_to_base_table[0]') kernel/time/hrtimer.c:121:22: warning: initialized field overwritten [-Woverride-init] 121 | [CLOCK_MONOTONIC] = HRTIMER_BASE_MONOTONIC, | ^~~~~~~~~~~~~~~~~~~~~~ kernel/time/hrtimer.c:121:22: note: (near initialization for 'hrtimer_clock_to_base_table[1]') kernel/time/hrtimer.c:122:21: warning: initialized field overwritten [-Woverride-init] 122 | [CLOCK_BOOTTIME] = HRTIMER_BASE_BOOTTIME, | ^~~~~~~~~~~~~~~~~~~~~ kernel/time/hrtimer.c:122:21: note: (near initialization for 'hrtimer_clock_to_base_table[7]') kernel/time/hrtimer.c:123:17: warning: initialized field overwritten [-Woverride-init] 123 | [CLOCK_TAI] = HRTIMER_BASE_TAI, | ^~~~~~~~~~~~~~~~ kernel/time/hrtimer.c:123:17: note: (near initialization for 'hrtimer_clock_to_base_table[11]') kernel/time/hrtimer.c: In function '__run_hrtimer': kernel/time/hrtimer.c:1648:7: warning: variable 'expires_in_hardirq' set but not used [-Wunused-but-set-variable] 1648 | bool expires_in_hardirq; | ^~~~~~~~~~~~~~~~~~ .. vim +1499 include/linux/perf_event.h 76193a94522f1d include/linux/perf_event.h Song Liu 2019-01-17 1495 76193a94522f1d include/linux/perf_event.h Song Liu 2019-01-17 1496 typedef int (perf_ksymbol_get_name_f)(char *name, int name_len, void *data); 76193a94522f1d include/linux/perf_event.h Song Liu 2019-01-17 1497 static inline void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len, 76193a94522f1d include/linux/perf_event.h Song Liu 2019-01-17 1498 bool unregister, const char *sym) { } 6ee52e2a3fe4ea include/linux/perf_event.h Song Liu 2019-01-17 @1499 static inline void perf_event_bpf_event(struct bpf_prog *prog, 6ee52e2a3fe4ea include/linux/perf_event.h Song Liu 2019-01-17 1500 enum perf_bpf_event_type type, 6ee52e2a3fe4ea include/linux/perf_event.h Song Liu 2019-01-17 1501 u16 flags) { } e041e328c4b41e include/linux/perf_event.h Peter Zijlstra 2014-05-21 1502 static inline void perf_event_exec(void) { } 82b897782d10fc include/linux/perf_event.h Adrian Hunter 2014-05-28 1503 static inline void perf_event_comm(struct task_struct *tsk, bool exec) { } e422267322cd31 include/linux/perf_event.h Hari Bathini 2017-03-08 1504 static inline void perf_event_namespaces(struct task_struct *tsk) { } cdd6c482c9ff9c include/linux/perf_event.h Ingo Molnar 2009-09-21 1505 static inline void perf_event_fork(struct task_struct *tsk) { } e17d43b93e544f include/linux/perf_event.h Adrian Hunter 2020-05-12 1506 static inline void perf_event_text_poke(const void *addr, e17d43b93e544f include/linux/perf_event.h Adrian Hunter 2020-05-12 1507 const void *old_bytes, e17d43b93e544f include/linux/perf_event.h Adrian Hunter 2020-05-12 1508 size_t old_len, e17d43b93e544f include/linux/perf_event.h Adrian Hunter 2020-05-12 1509 const void *new_bytes, e17d43b93e544f include/linux/perf_event.h Adrian Hunter 2020-05-12 1510 size_t new_len) { } cdd6c482c9ff9c include/linux/perf_event.h Ingo Molnar 2009-09-21 1511 static inline void perf_event_init(void) { } 4ed7c92d68a538 include/linux/perf_event.h Peter Zijlstra 2009-11-23 1512 static inline int perf_swevent_get_recursion_context(void) { return -1; } 4ed7c92d68a538 include/linux/perf_event.h Peter Zijlstra 2009-11-23 1513 static inline void perf_swevent_put_recursion_context(int rctx) { } ab573844e3058e include/linux/perf_event.h Jiri Olsa 2013-05-01 1514 static inline u64 perf_swevent_set_period(struct perf_event *event) { return 0; } 44234adcdce38f include/linux/perf_event.h Frederic Weisbecker 2009-12-09 1515 static inline void perf_event_enable(struct perf_event *event) { } 44234adcdce38f include/linux/perf_event.h Frederic Weisbecker 2009-12-09 1516 static inline void perf_event_disable(struct perf_event *event) { } 500ad2d8b01390 include/linux/perf_event.h K.Prasad 2012-08-02 1517 static inline int __perf_event_disable(void *info) { return -1; } e9d2b064149ff7 include/linux/perf_event.h Peter Zijlstra 2010-09-17 1518 static inline void perf_event_task_tick(void) { } ffe8690c85b842 include/linux/perf_event.h Kaixu Xia 2015-08-06 1519 static inline int perf_event_release_kernel(struct perf_event *event) { return 0; } 3ca270fc9edb25 include/linux/perf_event.h Like Xu 2019-10-27 1520 static inline int perf_event_period(struct perf_event *event, u64 value) 3ca270fc9edb25 include/linux/perf_event.h Like Xu 2019-10-27 1521 { 3ca270fc9edb25 include/linux/perf_event.h Like Xu 2019-10-27 1522 return -EINVAL; 3ca270fc9edb25 include/linux/perf_event.h Like Xu 2019-10-27 1523 } 52ba4b0b99770e include/linux/perf_event.h Like Xu 2019-10-27 1524 static inline u64 perf_event_pause(struct perf_event *event, bool reset) 52ba4b0b99770e include/linux/perf_event.h Like Xu 2019-10-27 1525 { 52ba4b0b99770e include/linux/perf_event.h Like Xu 2019-10-27 1526 return 0; 52ba4b0b99770e include/linux/perf_event.h Like Xu 2019-10-27 1527 } 0793a61d4df8da include/linux/perf_counter.h Thomas Gleixner 2008-12-04 1528 #endif 0793a61d4df8da include/linux/perf_counter.h Thomas Gleixner 2008-12-04 1529 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org