tree: https://github.com/zen-kernel/zen-kernel 5.14/prjc head: d549588e3d79002f0c4b567b49644318af78a3db commit: f746b5817d3274fa4f458f87f6b452e7304b1d64 [1/209] Project C v5.7.5-r2 config: um-x86_64_defconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/zen-kernel/zen-kernel/commit/f746b5817d3274fa4f458f87f... git remote add zen-kernel-zen-kernel https://github.com/zen-kernel/zen-kernel git fetch --no-tags zen-kernel-zen-kernel 5.14/prjc git checkout f746b5817d3274fa4f458f87f6b452e7304b1d64 # save the attached .config to linux build tree make W=1 ARCH=um SUBARCH=x86_64 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/alt_core.c:191: kernel/sched/alt_core.c: In function 'dequeue_task': kernel/sched/bmq_imp.h:52:2: error: implicit declaration of function 'sched_info_dequeued'; did you mean 'sched_info_dequeue'? [-Werror=implicit-function-declaration] 52 | sched_info_dequeued(rq, p); \ | ^~~~~~~~~~~~~~~~~~~ kernel/sched/alt_core.c:444:2: note: in expansion of macro '__SCHED_DEQUEUE_TASK' 444 | __SCHED_DEQUEUE_TASK(p, rq, flags, update_sched_rq_watermark(rq)); | ^~~~~~~~~~~~~~~~~~~~ kernel/sched/alt_core.c: In function 'enqueue_task': kernel/sched/bmq_imp.h:61:2: error: implicit declaration of function 'sched_info_queued'; did you mean 'sched_info_enqueue'? [-Werror=implicit-function-declaration] 61 | sched_info_queued(rq, p); \ | ^~~~~~~~~~~~~~~~~ kernel/sched/alt_core.c:461:2: note: in expansion of macro '__SCHED_ENQUEUE_TASK' 461 | __SCHED_ENQUEUE_TASK(p, rq, flags); | ^~~~~~~~~~~~~~~~~~~~ kernel/sched/alt_core.c: At top level: 652 | void resched_curr(struct rq *rq) | ^~~~~~~~~~~~ 675 | void resched_cpu(int cpu) | ^~~~~~~~~~~ kernel/sched/alt_core.c: In function 'activate_task': kernel/sched/alt_core.c:955:6: error: implicit declaration of function 'task_contributes_to_load' [-Werror=implicit-function-declaration] 955 | if (task_contributes_to_load(p)) | ^~~~~~~~~~~~~~~~~~~~~~~~ kernel/sched/alt_core.c: In function 'ttwu_stat': 1552 | struct rq *rq; | ^~ kernel/sched/alt_core.c: In function 'ttwu_do_wakeup': kernel/sched/alt_core.c:1578:5: error: 'struct task_struct' has no member named 'state'; did you mean '__state'? 1578 | p->state = TASK_RUNNING; | ^~~~~ | __state kernel/sched/alt_core.c: In function 'try_to_wake_up': kernel/sched/alt_core.c:1793:12: error: 'struct task_struct' has no member named 'state'; did you mean '__state'? 1793 | if (!(p->state & state)) | ^~~~~ | __state kernel/sched/alt_core.c:1799:6: error: 'struct task_struct' has no member named 'state'; did you mean '__state'? 1799 | p->state = TASK_RUNNING; | ^~~~~ | __state kernel/sched/alt_core.c:1812:11: error: 'struct task_struct' has no member named 'state'; did you mean '__state'? 1812 | if (!(p->state & state)) | ^~~~~ | __state kernel/sched/alt_core.c: In function 'sched_fork': kernel/sched/alt_core.c:1973:5: error: 'struct task_struct' has no member named 'state'; did you mean '__state'? 1973 | p->state = TASK_NEW; | ^~~~~ | __state kernel/sched/alt_core.c: In function 'wake_up_new_task': kernel/sched/alt_core.c:2136:5: error: 'struct task_struct' has no member named 'state'; did you mean '__state'? 2136 | p->state = TASK_RUNNING; | ^~~~~ | __state kernel/sched/alt_core.c: In function 'finish_task_switch': kernel/sched/alt_core.c:2384:21: error: 'struct task_struct' has no member named 'state'; did you mean '__state'? 2384 | prev_state = prev->state; | ^~~~~ | __state kernel/sched/alt_core.c: In function 'schedule_tail': kernel/sched/alt_core.c:2433:13: warning: variable 'rq' set but not used [-Wunused-but-set-variable] 2433 | struct rq *rq; | ^~ kernel/sched/alt_core.c: At top level: kernel/sched/alt_core.c:2518:15: error: conflicting types for 'nr_running' 2518 | unsigned long nr_running(void) | ^~~~~~~~~~ In file included from kernel/sched/alt_sched.h:16, from kernel/sched/sched.h:6, from kernel/sched/alt_core.c:14: include/linux/sched/stat.h:20:21: note: previous declaration of 'nr_running' was here 20 | extern unsigned int nr_running(void); | ^~~~~~~~~~ kernel/sched/alt_core.c:2565:15: error: conflicting types for 'nr_iowait_cpu' 2565 | unsigned long nr_iowait_cpu(int cpu) | ^~~~~~~~~~~~~ In file included from kernel/sched/alt_sched.h:16, from kernel/sched/sched.h:6, from kernel/sched/alt_core.c:14: include/linux/sched/stat.h:23:21: note: previous declaration of 'nr_iowait_cpu' was here 23 | extern unsigned int nr_iowait_cpu(int cpu); | ^~~~~~~~~~~~~ kernel/sched/alt_core.c:2600:15: error: conflicting types for 'nr_iowait' 2600 | unsigned long nr_iowait(void) | ^~~~~~~~~ In file included from kernel/sched/alt_sched.h:16, from kernel/sched/sched.h:6, from kernel/sched/alt_core.c:14: include/linux/sched/stat.h:22:21: note: previous declaration of 'nr_iowait' was here 22 | extern unsigned int nr_iowait(void); | ^~~~~~~~~ kernel/sched/alt_core.c:2706:6: error: conflicting types for 'arch_set_thermal_pressure' 2706 | void arch_set_thermal_pressure(struct cpumask *cpus, | ^~~~~~~~~~~~~~~~~~~~~~~~~ In file included from kernel/sched/alt_sched.h:19, from kernel/sched/sched.h:6, from kernel/sched/alt_core.c:14: include/linux/sched/topology.h:264:6: note: previous definition of 'arch_set_thermal_pressure' was here 264 | void arch_set_thermal_pressure(const struct cpumask *cpus, | ^~~~~~~~~~~~~~~~~~~~~~~~~ kernel/sched/alt_core.c: In function 'scheduler_tick': kernel/sched/alt_core.c:2753:2: error: implicit declaration of function 'psi_task_tick'; did you mean 'put_task_stack'? [-Werror=implicit-function-declaration] 2753 | psi_task_tick(rq); | ^~~~~~~~~~~~~ | put_task_stack kernel/sched/alt_core.c: In function '__schedule_bug': kernel/sched/alt_core.c:3097:16: warning: passing argument 1 of 'print_ip_sym' makes pointer from integer without a cast [-Wint-conversion] 3097 | print_ip_sym(preempt_disable_ip); | ^~~~~~~~~~~~~~~~~~ | | | long unsigned int In file included from include/linux/bpf.h:20, from include/linux/bpf-cgroup.h:5, from include/linux/cgroup-defs.h:22, from include/linux/cgroup.h:28, from kernel/sched/alt_sched.h:24, from kernel/sched/sched.h:6, from kernel/sched/alt_core.c:14: include/linux/kallsyms.h:177:45: note: expected 'const char *' but argument is of type 'long unsigned int' 177 | static inline void print_ip_sym(const char *loglvl, unsigned long ip) | ~~~~~~~~~~~~^~~~~~ kernel/sched/alt_core.c:3097:3: error: too few arguments to function 'print_ip_sym' 3097 | print_ip_sym(preempt_disable_ip); | ^~~~~~~~~~~~ -- | ^~~~~~~~~~~~ | hrtimer_start kernel/sched/alt_core.c: In function '__schedule': kernel/sched/alt_core.c:3357:24: error: 'struct task_struct' has no member named 'state'; did you mean '__state'? 3357 | if (!preempt && prev->state) { | ^~~~~ | __state kernel/sched/alt_core.c:3358:34: error: 'struct task_struct' has no member named 'state'; did you mean '__state'? 3358 | if (signal_pending_state(prev->state, prev)) { | ^~~~~ | __state kernel/sched/alt_core.c:3359:10: error: 'struct task_struct' has no member named 'state'; did you mean '__state'? 3359 | prev->state = TASK_RUNNING; | ^~~~~ | __state kernel/sched/alt_core.c: In function 'sched_submit_work': kernel/sched/alt_core.c:3438:12: error: 'struct task_struct' has no member named 'state'; did you mean '__state'? 3438 | if (!tsk->state) | ^~~~~ | __state In file included from include/asm-generic/bug.h:7, from ./arch/um/include/generated/asm/bug.h:1, from include/linux/bug.h:5, from include/linux/thread_info.h:13, from include/asm-generic/current.h:5, from ./arch/um/include/generated/asm/current.h:1, from include/linux/sched.h:12, from kernel/sched/alt_sched.h:4, from kernel/sched/sched.h:6, from kernel/sched/alt_core.c:14: kernel/sched/alt_core.c: In function 'schedule_idle': kernel/sched/alt_core.c:3512:24: error: 'struct task_struct' has no member named 'state'; did you mean '__state'? 3512 | WARN_ON_ONCE(current->state); | ^~~~~ include/linux/once_lite.h:15:27: note: in definition of macro 'DO_ONCE_LITE_IF' 15 | bool __ret_do_once = !!(condition); \ | ^~~~~~~~~ kernel/sched/alt_core.c:3512:2: note: in expansion of macro 'WARN_ON_ONCE' 3512 | WARN_ON_ONCE(current->state); | ^~~~~~~~~~~~ kernel/sched/alt_core.c: In function '__sched_setscheduler': kernel/sched/alt_core.c:4031:39: error: 'MAX_USER_RT_PRIO' undeclared (first use in this function); did you mean 'MAX_RT_PRIO'? 4031 | (p->mm && attr->sched_priority > MAX_USER_RT_PRIO - 1) || | ^~~~~~~~~~~~~~~~ | MAX_RT_PRIO kernel/sched/alt_core.c:4031:39: note: each undeclared identifier is reported only once for each function it appears in kernel/sched/alt_core.c: At top level: kernel/sched/alt_core.c:4749:13: error: redefinition of '_cond_resched' 4749 | int __sched _cond_resched(void) | ^~~~~~~~~~~~~ In file included from kernel/sched/alt_sched.h:4, from kernel/sched/sched.h:6, from kernel/sched/alt_core.c:14: include/linux/sched.h:1948:19: note: previous definition of '_cond_resched' was here 1948 | static inline int _cond_resched(void) | ^~~~~~~~~~~~~ kernel/sched/alt_core.c: In function '__do_sys_sched_get_priority_max': kernel/sched/alt_core.c:4902:9: error: 'MAX_USER_RT_PRIO' undeclared (first use in this function); did you mean 'MAX_RT_PRIO'? 4902 | ret = MAX_USER_RT_PRIO-1; | ^~~~~~~~~~~~~~~~ | MAX_RT_PRIO kernel/sched/alt_core.c: In function 'sched_show_task': kernel/sched/alt_core.c:5010:9: error: 'struct task_struct' has no member named 'state'; did you mean '__state'? 5010 | if (p->state == TASK_RUNNING) | ^~~~~ | __state kernel/sched/alt_core.c:5025:2: error: too few arguments to function 'show_stack' 5025 | show_stack(p, NULL); | ^~~~~~~~~~ In file included from kernel/sched/alt_sched.h:9, from kernel/sched/sched.h:6, from kernel/sched/alt_core.c:14: include/linux/sched/debug.h:33:13: note: declared here 33 | extern void show_stack(struct task_struct *task, unsigned long *sp, | ^~~~~~~~~~ kernel/sched/alt_core.c: In function 'state_filter_match': kernel/sched/alt_core.c:5038:11: error: 'struct task_struct' has no member named 'state'; did you mean '__state'? 5038 | if (!(p->state & state_filter)) | ^~~~~ | __state kernel/sched/alt_core.c:5045:49: error: 'struct task_struct' has no member named 'state'; did you mean '__state'? 5045 | if (state_filter == TASK_UNINTERRUPTIBLE && p->state == TASK_IDLE) | ^~~~~ | __state kernel/sched/alt_core.c: At top level: kernel/sched/alt_core.c:5052:6: error: conflicting types for 'show_state_filter' 5052 | void show_state_filter(unsigned long state_filter) | ^~~~~~~~~~~~~~~~~ In file included from kernel/sched/alt_sched.h:9, from kernel/sched/sched.h:6, from kernel/sched/alt_core.c:14: include/linux/sched/debug.h:17:13: note: previous declaration of 'show_state_filter' was here 17 | extern void show_state_filter(unsigned int state_filter); | ^~~~~~~~~~~~~~~~~ kernel/sched/alt_core.c: In function 'init_idle': kernel/sched/alt_core.c:5118:8: error: 'struct task_struct' has no member named 'state'; did you mean '__state'? 5118 | idle->state = TASK_RUNNING; | ^~~~~ | __state kernel/sched/alt_core.c: At top level: 5813 | struct task_group *sched_create_group(struct task_group *parent) | ^~~~~~~~~~~~~~~~~~ 5824 | void sched_online_group(struct task_group *tg, struct task_group *parent) | ^~~~~~~~~~~~~~~~~~ 5835 | void sched_destroy_group(struct task_group *tg) | ^~~~~~~~~~~~~~~~~~~ 5841 | void sched_offline_group(struct task_group *tg) | ^~~~~~~~~~~~~~~~~~~ 5933 | .legacy_cftypes = cpu_legacy_files, | ^~~~~~~~~~~~~~~~ kernel/sched/alt_core.c:5933:20: note: (near initialization for 'cpu_cgrp_subsys.legacy_cftypes') kernel/sched/alt_core.c:142:18: warning: 'sched_sg_idle_mask' defined but not used [-Wunused-variable] 142 | static cpumask_t sched_sg_idle_mask ____cacheline_aligned_in_smp; | ^~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/resched_curr +652 kernel/sched/alt_core.c 453 454 static inline void enqueue_task(struct task_struct *p, struct rq *rq, int flags) 455 { 456 lockdep_assert_held(&rq->lock); 457 458 WARN_ONCE(task_rq(p) != rq, "sched: enqueue task reside on cpu%d to cpu%d\n", 459 task_cpu(p), cpu_of(rq)); 460 462 update_sched_rq_watermark(rq); 463 ++rq->nr_running; 464 #ifdef CONFIG_SMP 465 if (2 == rq->nr_running) 466 cpumask_set_cpu(cpu_of(rq), &sched_rq_pending_mask); 467 #endif 468 469 sched_update_tick_dependency(rq); 470 471 /* 472 * If in_iowait is set, the code below may not trigger any cpufreq 473 * utilization updates, so do it here explicitly with the IOWAIT flag 474 * passed. 475 */ 476 if (p->in_iowait) 477 cpufreq_update_util(rq, SCHED_CPUFREQ_IOWAIT); 478 } 479 480 static inline void requeue_task(struct task_struct *p, struct rq *rq) 481 { 482 lockdep_assert_held(&rq->lock); 483 WARN_ONCE(task_rq(p) != rq, "sched: cpu[%d] requeue task reside on cpu%d\n", 484 cpu_of(rq), task_cpu(p)); 485 486 __requeue_task(p, rq); 487 } 488 489 /* 490 * cmpxchg based fetch_or, macro so it works for different integer types 491 */ 492 #define fetch_or(ptr, mask) \ 493 ({ \ 494 typeof(ptr) _ptr = (ptr); \ 495 typeof(mask) _mask = (mask); \ 496 typeof(*_ptr) _old, _val = *_ptr; \ 497 \ 498 for (;;) { \ 499 _old = cmpxchg(_ptr, _val, _val | _mask); \ 500 if (_old == _val) \ 501 break; \ 502 _val = _old; \ 503 } \ 504 _old; \ 505 }) 506 507 #if defined(CONFIG_SMP) && defined(TIF_POLLING_NRFLAG) 508 /* 509 * Atomically set TIF_NEED_RESCHED and test for TIF_POLLING_NRFLAG, 510 * this avoids any races wrt polling state changes and thereby avoids 511 * spurious IPIs. 512 */ 513 static bool set_nr_and_not_polling(struct task_struct *p) 514 { 515 struct thread_info *ti = task_thread_info(p); 516 return !(fetch_or(&ti->flags, _TIF_NEED_RESCHED) & _TIF_POLLING_NRFLAG); 517 } 518 519 /* 520 * Atomically set TIF_NEED_RESCHED if TIF_POLLING_NRFLAG is set. 521 * 522 * If this returns true, then the idle task promises to call 523 * sched_ttwu_pending() and reschedule soon. 524 */ 525 static bool set_nr_if_polling(struct task_struct *p) 526 { 527 struct thread_info *ti = task_thread_info(p); 528 typeof(ti->flags) old, val = READ_ONCE(ti->flags); 529 530 for (;;) { 531 if (!(val & _TIF_POLLING_NRFLAG)) 532 return false; 533 if (val & _TIF_NEED_RESCHED) 534 return true; 535 old = cmpxchg(&ti->flags, val, val | _TIF_NEED_RESCHED); 536 if (old == val) 537 break; 538 val = old; 539 } 540 return true; 541 } 542 543 #else 544 static bool set_nr_and_not_polling(struct task_struct *p) 545 { 546 set_tsk_need_resched(p); 547 return true; 548 } 549 550 #ifdef CONFIG_SMP 551 static bool set_nr_if_polling(struct task_struct *p) 552 { 553 return false; 554 } 555 #endif 556 #endif 557 558 static bool __wake_q_add(struct wake_q_head *head, struct task_struct *task) 559 { 560 struct wake_q_node *node = &task->wake_q; 561 562 /* 563 * Atomically grab the task, if ->wake_q is !nil already it means 564 * its already queued (either by us or someone else) and will get the 565 * wakeup due to that. 566 * 567 * In order to ensure that a pending wakeup will observe our pending 568 * state, even in the failed case, an explicit smp_mb() must be used. 569 */ 570 smp_mb__before_atomic(); 571 if (unlikely(cmpxchg_relaxed(&node->next, NULL, WAKE_Q_TAIL))) 572 return false; 573 574 /* 575 * The head is context local, there can be no concurrency. 576 */ 577 *head->lastp = node; 578 head->lastp = &node->next; 579 return true; 580 } 581 582 /** 583 * wake_q_add() - queue a wakeup for 'later' waking. 584 * @head: the wake_q_head to add @task to 585 * @task: the task to queue for 'later' wakeup 586 * 587 * Queue a task for later wakeup, most likely by the wake_up_q() call in the 588 * same context, _HOWEVER_ this is not guaranteed, the wakeup can come 589 * instantly. 590 * 591 * This function must be used as-if it were wake_up_process(); IOW the task 592 * must be ready to be woken at this location. 593 */ 594 void wake_q_add(struct wake_q_head *head, struct task_struct *task) 595 { 596 if (__wake_q_add(head, task)) 597 get_task_struct(task); 598 } 599 600 /** 601 * wake_q_add_safe() - safely queue a wakeup for 'later' waking. 602 * @head: the wake_q_head to add @task to 603 * @task: the task to queue for 'later' wakeup 604 * 605 * Queue a task for later wakeup, most likely by the wake_up_q() call in the 606 * same context, _HOWEVER_ this is not guaranteed, the wakeup can come 607 * instantly. 608 * 609 * This function must be used as-if it were wake_up_process(); IOW the task 610 * must be ready to be woken at this location. 611 * 612 * This function is essentially a task-safe equivalent to wake_q_add(). Callers 613 * that already hold reference to @task can call the 'safe' version and trust 614 * wake_q to do the right thing depending whether or not the @task is already 615 * queued for wakeup. 616 */ 617 void wake_q_add_safe(struct wake_q_head *head, struct task_struct *task) 618 { 619 if (!__wake_q_add(head, task)) 620 put_task_struct(task); 621 } 622 623 void wake_up_q(struct wake_q_head *head) 624 { 625 struct wake_q_node *node = head->first; 626 627 while (node != WAKE_Q_TAIL) { 628 struct task_struct *task; 629 630 task = container_of(node, struct task_struct, wake_q); 631 BUG_ON(!task); 632 /* task can safely be re-inserted now: */ 633 node = node->next; 634 task->wake_q.next = NULL; 635 636 /* 637 * wake_up_process() executes a full barrier, which pairs with 638 * the queueing in wake_q_add() so as not to miss wakeups. 639 */ 640 wake_up_process(task); 641 put_task_struct(task); 642 } 643 } 644 645 /* 646 * resched_curr - mark rq's current task 'to be rescheduled now'. 647 * 648 * On UP this means the setting of the need_resched flag, on SMP it 649 * might also involve a cross-CPU call to trigger the scheduler on 650 * the target CPU. 651 */ 653 { 654 struct task_struct *curr = rq->curr; 655 int cpu; 656 657 lockdep_assert_held(&rq->lock); 658 659 if (test_tsk_need_resched(curr)) 660 return; 661 662 cpu = cpu_of(rq); 663 if (cpu == smp_processor_id()) { 664 set_tsk_need_resched(curr); 665 set_preempt_need_resched(); 666 return; 667 } 668 669 if (set_nr_and_not_polling(curr)) 670 smp_send_reschedule(cpu); 671 else 672 trace_sched_wake_idle_without_ipi(cpu); 673 } 674 676 { 677 struct rq *rq = cpu_rq(cpu); 678 unsigned long flags; 679 680 raw_spin_lock_irqsave(&rq->lock, flags); 681 if (cpu_online(cpu) || cpu == smp_processor_id()) 682 resched_curr(cpu_rq(cpu)); 683 raw_spin_unlock_irqrestore(&rq->lock, flags); 684 } 685 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org