tree: https://github.com/zen-kernel/zen-kernel 5.14/cacule head: 4430be30ae5bf7d608eb292aa8680a2dc82ca847 commit: 9e3f9e4d524cfe1d20d03a731930e4d6ebacbfd8 [1/2] CacULE 5.14 config: ia64-allmodconfig (attached as .config) compiler: ia64-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/zen-kernel/zen-kernel/commit/9e3f9e4d524cfe1d20d03a731... git remote add zen-kernel-zen-kernel https://github.com/zen-kernel/zen-kernel git fetch --no-tags zen-kernel-zen-kernel 5.14/cacule git checkout 9e3f9e4d524cfe1d20d03a731930e4d6ebacbfd8 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=ia64 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 >>): kernel/sched/fair.c:11849:6: warning: no previous prototype for 'task_vruntime_update' [-Wmissing-prototypes] 11849 | void task_vruntime_update(struct rq *rq, struct task_struct *p, bool in_fi) | ^~~~~~~~~~~~~~~~~~~~ kernel/sched/fair.c: In function 'cfs_prio_less': 11865 | struct cfs_rq *cfs_rqb; | ^~~~~~~ 11864 | struct cfs_rq *cfs_rqa; | ^~~~~~~ vim +/cfs_rqb +11865 kernel/sched/fair.c c6047c2e3af68d Joel Fernandes (Google 2020-11-17 11858) c6047c2e3af68d Joel Fernandes (Google 2020-11-17 11859) bool cfs_prio_less(struct task_struct *a, struct task_struct *b, bool in_fi) c6047c2e3af68d Joel Fernandes (Google 2020-11-17 11860) { c6047c2e3af68d Joel Fernandes (Google 2020-11-17 11861) struct rq *rq = task_rq(a); c6047c2e3af68d Joel Fernandes (Google 2020-11-17 11862) struct sched_entity *sea = &a->se; c6047c2e3af68d Joel Fernandes (Google 2020-11-17 11863) struct sched_entity *seb = &b->se; c6047c2e3af68d Joel Fernandes (Google 2020-11-17 @11864) struct cfs_rq *cfs_rqa; c6047c2e3af68d Joel Fernandes (Google 2020-11-17 @11865) struct cfs_rq *cfs_rqb; c6047c2e3af68d Joel Fernandes (Google 2020-11-17 11866) s64 delta; c6047c2e3af68d Joel Fernandes (Google 2020-11-17 11867) c6047c2e3af68d Joel Fernandes (Google 2020-11-17 11868) SCHED_WARN_ON(task_rq(b)->core != rq->core); c6047c2e3af68d Joel Fernandes (Google 2020-11-17 11869) :::::: The code at line 11865 was first introduced by commit :::::: c6047c2e3af68dae23ad884249e0d42ff28d2d1b sched/fair: Snapshot the min_vruntime of CPUs on force idle :::::: TO: Joel Fernandes (Google) <joel(a)joelfernandes.org&gt; :::::: CC: Peter Zijlstra <peterz(a)infradead.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org