Hi Paolo, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on nf/master] [also build test WARNING on linus/master v5.14-rc2 next-20210721] [cannot apply to nf-next/master security/next-testing] [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/Paolo-Abeni/sk_buff-track-nfct-s... base: https://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git master config: mips-randconfig-r001-20210720 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project c781eb153bfbd1b52b03efe34f56bbeccbb8aba6) 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 # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://github.com/0day-ci/linux/commit/973d99858ab4990b527f70441c4dae8b8... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Paolo-Abeni/sk_buff-track-nfct-status-in-newly-added-skb-_state/20210722-014505 git checkout 973d99858ab4990b527f70441c4dae8b87637c41 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 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 kernel/sched/core.c:13: In file included from kernel/sched/sched.h:50: In file included from include/linux/init_task.h:18: In file included from include/net/net_namespace.h:39: return NULL; ^~~~ include/linux/stddef.h:8:14: note: expanded from macro 'NULL' #define NULL ((void *)0) ^~~~~~~~~~~ kernel/sched/core.c:3260:20: warning: unused function 'rq_has_pinned_tasks' [-Wunused-function] static inline bool rq_has_pinned_tasks(struct rq *rq) ^ kernel/sched/core.c:5111:20: warning: unused function 'sched_tick_start' [-Wunused-function] static inline void sched_tick_start(int cpu) { } ^ kernel/sched/core.c:5112:20: warning: unused function 'sched_tick_stop' [-Wunused-function] static inline void sched_tick_stop(int cpu) { } ^ kernel/sched/core.c:5769:20: warning: unused function 'sched_core_cpu_starting' [-Wunused-function] static inline void sched_core_cpu_starting(unsigned int cpu) {} ^ 5 warnings generated. -- In file included from kernel/sched/loadavg.c:9: In file included from kernel/sched/sched.h:50: In file included from include/linux/init_task.h:18: In file included from include/net/net_namespace.h:39: return NULL; ^~~~ include/linux/stddef.h:8:14: note: expanded from macro 'NULL' #define NULL ((void *)0) ^~~~~~~~~~~ 1 warning generated. -- In file included from kernel/sched/fair.c:23: In file included from kernel/sched/sched.h:50: In file included from include/linux/init_task.h:18: In file included from include/net/net_namespace.h:39: return NULL; ^~~~ include/linux/stddef.h:8:14: note: expanded from macro 'NULL' #define NULL ((void *)0) ^~~~~~~~~~~ kernel/sched/fair.c:591:5: warning: no previous prototype for function 'sched_update_scaling' [-Wmissing-prototypes] int sched_update_scaling(void) ^ kernel/sched/fair.c:591:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int sched_update_scaling(void) ^ static kernel/sched/fair.c:2939:20: warning: unused function 'account_numa_enqueue' [-Wunused-function] static inline void account_numa_enqueue(struct rq *rq, struct task_struct *p) ^ kernel/sched/fair.c:2943:20: warning: unused function 'account_numa_dequeue' [-Wunused-function] static inline void account_numa_dequeue(struct rq *rq, struct task_struct *p) ^ kernel/sched/fair.c:2947:20: warning: unused function 'update_scan_period' [-Wunused-function] static inline void update_scan_period(struct task_struct *p, int new_cpu) ^ kernel/sched/fair.c:4110:20: warning: unused function 'cfs_rq_is_decayed' [-Wunused-function] static inline bool cfs_rq_is_decayed(struct cfs_rq *cfs_rq) ^ kernel/sched/fair.c:5432:19: warning: unused function 'throttled_lb_pair' [-Wunused-function] static inline int throttled_lb_pair(struct task_group *tg, ^ kernel/sched/fair.c:5449:20: warning: unused function 'update_runtime_enabled' [-Wunused-function] static inline void update_runtime_enabled(struct rq *rq) {} ^ kernel/sched/fair.c:5450:20: warning: unused function 'unthrottle_offline_cfs_rqs' [-Wunused-function] static inline void unthrottle_offline_cfs_rqs(struct rq *rq) {} ^ 9 warnings generated. -- In file included from kernel/sched/rt.c:6: In file included from kernel/sched/sched.h:50: In file included from include/linux/init_task.h:18: In file included from include/net/net_namespace.h:39: return NULL; ^~~~ include/linux/stddef.h:8:14: note: expanded from macro 'NULL' #define NULL ((void *)0) ^~~~~~~~~~~ kernel/sched/rt.c:669:6: warning: no previous prototype for function 'sched_rt_bandwidth_account' [-Wmissing-prototypes] bool sched_rt_bandwidth_account(struct rt_rq *rt_rq) ^ kernel/sched/rt.c:669:1: note: declare 'static' if the function is not intended to be used outside of this translation unit bool sched_rt_bandwidth_account(struct rt_rq *rt_rq) ^ static kernel/sched/rt.c:421:20: warning: unused function 'need_pull_rt_task' [-Wunused-function] static inline bool need_pull_rt_task(struct rq *rq, struct task_struct *prev) ^ kernel/sched/rt.c:426:20: warning: unused function 'pull_rt_task' [-Wunused-function] static inline void pull_rt_task(struct rq *this_rq) ^ kernel/sched/rt.c:476:20: warning: unused function 'rt_task_fits_capacity' [-Wunused-function] static inline bool rt_task_fits_capacity(struct task_struct *p, int cpu) ^ kernel/sched/rt.c:1113:6: warning: unused function 'inc_rt_prio_smp' [-Wunused-function] void inc_rt_prio_smp(struct rt_rq *rt_rq, int prio, int prev_prio) {} ^ kernel/sched/rt.c:1115:6: warning: unused function 'dec_rt_prio_smp' [-Wunused-function] void dec_rt_prio_smp(struct rt_rq *rt_rq, int prio, int prev_prio) {} ^ 7 warnings generated. -- In file included from kernel/sched/deadline.c:18: In file included from kernel/sched/sched.h:50: In file included from include/linux/init_task.h:18: In file included from include/net/net_namespace.h:39: return NULL; ^~~~ include/linux/stddef.h:8:14: note: expanded from macro 'NULL' #define NULL ((void *)0) ^~~~~~~~~~~ kernel/sched/deadline.c:686:20: warning: unused function 'need_pull_dl_task' [-Wunused-function] static inline bool need_pull_dl_task(struct rq *rq, struct task_struct *prev) ^ kernel/sched/deadline.c:691:20: warning: unused function 'pull_dl_task' [-Wunused-function] static inline void pull_dl_task(struct rq *rq) ^ 3 warnings generated. vim +4240 include/linux/skbuff.h 4234 4235 static inline __u32 skb_secmark(const struct sk_buff *skb) 4236 { 4237 #if IS_ENABLED(CONFIG_NETWORK_SECMARK) 4238 return skb->secmark_present ? skb->_secmark : 0; 4239 #else 4241 #endif 4242 } 4243 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org