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] [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: nios2-defconfig (attached as .config) compiler: nios2-linux-gcc (GCC) 10.3.0 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/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=gcc-10.3.0 make.cross ARCH=nios2 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/uapi/linux/posix_types.h:5, from include/uapi/linux/types.h:14, from include/linux/types.h:6, from include/linux/kasan-checks.h:5, from include/asm-generic/rwonce.h:26, from ./arch/nios2/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:264, from include/linux/err.h:5, from include/linux/kthread.h:5, from include/trace/events/sched.h:8, from kernel/sched/core.c:10: include/linux/skbuff.h: In function 'skb_secmark': 8 | #define NULL ((void *)0) | ^ include/linux/skbuff.h:4240:9: note: in expansion of macro 'NULL' 4240 | return NULL; | ^~~~ kernel/sched/core.c: In function 'ttwu_stat': kernel/sched/core.c:3270:13: warning: variable 'rq' set but not used [-Wunused-but-set-variable] 3270 | struct rq *rq; | ^~ -- In file included from include/uapi/linux/posix_types.h:5, from include/uapi/linux/types.h:14, from include/linux/types.h:6, from include/uapi/linux/sched.h:5, from include/linux/sched.h:10, from kernel/sched/sched.h:5, from kernel/sched/loadavg.c:9: include/linux/skbuff.h: In function 'skb_secmark': 8 | #define NULL ((void *)0) | ^ include/linux/skbuff.h:4240:9: note: in expansion of macro 'NULL' 4240 | return NULL; | ^~~~ -- In file included from include/uapi/linux/posix_types.h:5, from include/uapi/linux/types.h:14, from include/linux/types.h:6, from include/uapi/linux/sched.h:5, from include/linux/sched.h:10, from kernel/sched/sched.h:5, from kernel/sched/fair.c:23: include/linux/skbuff.h: In function 'skb_secmark': 8 | #define NULL ((void *)0) | ^ include/linux/skbuff.h:4240:9: note: in expansion of macro 'NULL' 4240 | return NULL; | ^~~~ kernel/sched/fair.c: At top level: kernel/sched/fair.c:591:5: warning: no previous prototype for 'sched_update_scaling' [-Wmissing-prototypes] 591 | int sched_update_scaling(void) | ^~~~~~~~~~~~~~~~~~~~ kernel/sched/fair.c:5438:6: warning: no previous prototype for 'init_cfs_bandwidth' [-Wmissing-prototypes] 5438 | void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {} | ^~~~~~~~~~~~~~~~~~ kernel/sched/fair.c:11457:6: warning: no previous prototype for 'free_fair_sched_group' [-Wmissing-prototypes] 11457 | void free_fair_sched_group(struct task_group *tg) { } | ^~~~~~~~~~~~~~~~~~~~~ kernel/sched/fair.c:11459:5: warning: no previous prototype for 'alloc_fair_sched_group' [-Wmissing-prototypes] 11459 | int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent) | ^~~~~~~~~~~~~~~~~~~~~~ kernel/sched/fair.c:11464:6: warning: no previous prototype for 'online_fair_sched_group' [-Wmissing-prototypes] 11464 | void online_fair_sched_group(struct task_group *tg) { } | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/sched/fair.c:11466:6: warning: no previous prototype for 'unregister_fair_sched_group' [-Wmissing-prototypes] 11466 | void unregister_fair_sched_group(struct task_group *tg) { } | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ -- In file included from include/uapi/linux/posix_types.h:5, from include/uapi/linux/types.h:14, from include/linux/types.h:6, from include/uapi/linux/sched.h:5, from include/linux/sched.h:10, from kernel/sched/sched.h:5, from kernel/sched/rt.c:6: include/linux/skbuff.h: In function 'skb_secmark': 8 | #define NULL ((void *)0) | ^ include/linux/skbuff.h:4240:9: note: in expansion of macro 'NULL' 4240 | return NULL; | ^~~~ kernel/sched/rt.c: At top level: kernel/sched/rt.c:253:6: warning: no previous prototype for 'free_rt_sched_group' [-Wmissing-prototypes] 253 | void free_rt_sched_group(struct task_group *tg) { } | ^~~~~~~~~~~~~~~~~~~ kernel/sched/rt.c:255:5: warning: no previous prototype for 'alloc_rt_sched_group' [-Wmissing-prototypes] 255 | int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent) | ^~~~~~~~~~~~~~~~~~~~ kernel/sched/rt.c:669:6: warning: no previous prototype for 'sched_rt_bandwidth_account' [-Wmissing-prototypes] 669 | bool sched_rt_bandwidth_account(struct rt_rq *rt_rq) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ vim +8 include/linux/stddef.h ^1da177e4c3f41 Linus Torvalds 2005-04-16 6 ^1da177e4c3f41 Linus Torvalds 2005-04-16 7 #undef NULL ^1da177e4c3f41 Linus Torvalds 2005-04-16 @8 #define NULL ((void *)0) 6e218287432472 Richard Knutsson 2006-09-30 9 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org