tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-4.19 head: 45baa007ba13bc516470dbd9379b2f7525a087e1 commit: 1727d28632e4f124f314bc19ad4f40ec183fe60e [52/59] FROMLIST: sched/fair: core wide vruntime comparison config: x86_64-allnoconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 487ca07fcc75d52755c9fe2ee05bcb3b6eeeec44) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git checkout 1727d28632e4f124f314bc19ad4f40ec183fe60e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 >>, old ones prefixed by <<): In file included from kernel/sched/fair.c:23: kernel/sched/sched.h:1208:15: warning: variable 'cookie' is uninitialized when used here [-Wuninitialized] rf->cookie = lockdep_pin_lock(rq_lockp(rq)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/lockdep.h:455:60: note: expanded from macro 'lockdep_pin_lock' #define lockdep_pin_lock(l) ({ struct pin_cookie cookie; cookie; }) ^~~~~~ kernel/sched/sched.h:1208:15: note: variable 'cookie' is declared here include/linux/lockdep.h:455:34: note: expanded from macro 'lockdep_pin_lock' #define lockdep_pin_lock(l) ({ struct pin_cookie cookie; cookie; }) ^ << In file included from kernel/sched/fair.c:23: while (!is_same_group(sea, seb)) { ^ << In file included from kernel/sched/fair.c:23: int sea_depth = sea->depth; ~~~ ^ kernel/sched/fair.c:541:25: error: no member named 'depth' in 'struct sched_entity' int seb_depth = seb->depth; ~~~ ^ << In file included from kernel/sched/fair.c:23: while (sea->parent) ~~~ ^ kernel/sched/fair.c:555:14: error: no member named 'parent' in 'struct sched_entity' sea = sea->parent; ~~~ ^ kernel/sched/fair.c:556:14: error: no member named 'parent' in 'struct sched_entity' while (seb->parent) ~~~ ^ kernel/sched/fair.c:557:14: error: no member named 'parent' in 'struct sched_entity' seb = seb->parent; ~~~ ^ kernel/sched/fair.c:5214:6: warning: no previous prototype for function 'init_cfs_bandwidth' [-Wmissing-prototypes] void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {} ^ kernel/sched/fair.c:5214:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {} ^ static kernel/sched/fair.c:11366:6: warning: no previous prototype for function 'free_fair_sched_group' [-Wmissing-prototypes] void free_fair_sched_group(struct task_group *tg) { } ^ kernel/sched/fair.c:11366:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void free_fair_sched_group(struct task_group *tg) { } ^ static kernel/sched/fair.c:11368:5: warning: no previous prototype for function 'alloc_fair_sched_group' [-Wmissing-prototypes] int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent) ^ kernel/sched/fair.c:11368:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent) ^ static kernel/sched/fair.c:11373:6: warning: no previous prototype for function 'online_fair_sched_group' [-Wmissing-prototypes] void online_fair_sched_group(struct task_group *tg) { } ^ kernel/sched/fair.c:11373:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void online_fair_sched_group(struct task_group *tg) { } ^ static kernel/sched/fair.c:11375:6: warning: no previous prototype for function 'unregister_fair_sched_group' [-Wmissing-prototypes] void unregister_fair_sched_group(struct task_group *tg) { } ^ kernel/sched/fair.c:11375:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void unregister_fair_sched_group(struct task_group *tg) { } ^ static 6 warnings and 7 errors generated. vim +/is_same_group +539 kernel/sched/fair.c 528 529 bool cfs_prio_less(struct task_struct *a, struct task_struct *b) 530 { 531 struct sched_entity *sea = &a->se; 532 struct sched_entity *seb = &b->se; 533 bool samecpu = task_cpu(a) == task_cpu(b); 534 struct task_struct *p; 535 s64 delta; 536 537 if (samecpu) { 538 /* vruntime is per cfs_rq */ 541 int seb_depth = seb->depth; 542 543 if (sea_depth >= seb_depth) 544 sea = parent_entity(sea); 545 if (sea_depth <= seb_depth) 546 seb = parent_entity(seb); 547 } 548 549 delta = (s64)(sea->vruntime - seb->vruntime); 550 goto out; 551 } 552 553 /* crosscpu: compare root level se's vruntime to decide priority */ 555 sea = sea->parent; 556 while (seb->parent) 557 seb = seb->parent; 558 delta = (s64)(sea->vruntime - seb->vruntime); 559 560 out: 561 p = delta > 0 ? b : a; 562 trace_printk("picked %s/%d %s: %Ld %Ld %Ld\n", p->comm, p->pid, 563 samecpu ? "samecpu" : "crosscpu", 564 sea->vruntime, seb->vruntime, delta); 565 566 return delta > 0; 567 } 568 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org