[openeuler:OLK-6.6 2628/2628] kernel/locking/mutex.c:623:6: warning: variable 'ifs_clock' is used uninitialized whenever 'if' condition is true
tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 1ca83de3cbd1afcc3038a46ab4c4c4626b9a4712 commit: a1ad9b2ed459a3e3a4a2de50e03f53036fc7ec96 [2628/2628] interference: Add mutex interference track support config: x86_64-buildonly-randconfig-2002-20250801 (https://download.01.org/0day-ci/archive/20250801/202508012102.cdVlsY7O-lkp@i...) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250801/202508012102.cdVlsY7O-lkp@i...) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202508012102.cdVlsY7O-lkp@intel.com/ All warnings (new ones prefixed by >>):
kernel/locking/mutex.c:623:6: warning: variable 'ifs_clock' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] 623 | if (__mutex_trylock(lock)) { | ^~~~~~~~~~~~~~~~~~~~~ kernel/locking/mutex.c:725:24: note: uninitialized use occurs here 725 | cgroup_ifs_leave_lock(ifs_clock, IFS_MUTEX); | ^~~~~~~~~ kernel/locking/mutex.c:623:2: note: remove the 'if' if its condition is always false 623 | if (__mutex_trylock(lock)) { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ 624 | if (ww_ctx) | ~~~~~~~~~~~ 625 | __ww_mutex_check_waiters(lock, ww_ctx); | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 626 | 627 | goto skip_wait; | ~~~~~~~~~~~~~~~ 628 | } | ~ kernel/locking/mutex.c:576:15: note: initialize the variable 'ifs_clock' to silence this warning 576 | u64 ifs_clock; | ^ | = 0 1 warning generated.
vim +623 kernel/locking/mutex.c 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 565 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 566 /* 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 567 * Lock a mutex (possibly interruptible), slowpath: 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 568 */ 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 569 static __always_inline int __sched 2f064a59a11ff9 kernel/locking/mutex.c Peter Zijlstra 2021-06-11 570 __mutex_lock_common(struct mutex *lock, unsigned int state, unsigned int subclass, 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 571 struct lockdep_map *nest_lock, unsigned long ip, b0267507dfd018 kernel/mutex.c Tetsuo Handa 2013-10-17 572 struct ww_acquire_ctx *ww_ctx, const bool use_ww_ctx) 6053ee3b32e343 kernel/mutex.c Ingo Molnar 2006-01-09 573 { 6053ee3b32e343 kernel/mutex.c Ingo Molnar 2006-01-09 574 struct mutex_waiter waiter; a40ca56577f628 kernel/locking/mutex.c Waiman Long 2016-08-26 575 struct ww_mutex *ww; a1ad9b2ed459a3 kernel/locking/mutex.c Pu Lehui 2025-07-16 576 u64 ifs_clock; 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 577 int ret; 6053ee3b32e343 kernel/mutex.c Ingo Molnar 2006-01-09 578 5de2055d31ea88 kernel/locking/mutex.c Waiman Long 2021-03-16 579 if (!use_ww_ctx) 5de2055d31ea88 kernel/locking/mutex.c Waiman Long 2021-03-16 580 ww_ctx = NULL; 5de2055d31ea88 kernel/locking/mutex.c Waiman Long 2021-03-16 581 427b18207a87f6 kernel/locking/mutex.c Peter Zijlstra 2016-12-23 582 might_sleep(); ea9e0fb8fe1bdf kernel/locking/mutex.c Nicolai Hähnle 2016-12-21 583 e6b4457b05f36b kernel/locking/mutex.c Peter Zijlstra 2021-06-30 584 MUTEX_WARN_ON(lock->magic != lock); 6c11c6e3d5e9e5 kernel/locking/mutex.c Sebastian Andrzej Siewior 2019-07-03 585 a40ca56577f628 kernel/locking/mutex.c Waiman Long 2016-08-26 586 ww = container_of(lock, struct ww_mutex, base); 5de2055d31ea88 kernel/locking/mutex.c Waiman Long 2021-03-16 587 if (ww_ctx) { 0422e83d84ae24 kernel/locking/mutex.c Chris Wilson 2016-05-26 588 if (unlikely(ww_ctx == READ_ONCE(ww->ctx))) 0422e83d84ae24 kernel/locking/mutex.c Chris Wilson 2016-05-26 589 return -EALREADY; 08295b3b5beec9 kernel/locking/mutex.c Thomas Hellstrom 2018-06-15 590 08295b3b5beec9 kernel/locking/mutex.c Thomas Hellstrom 2018-06-15 591 /* 08295b3b5beec9 kernel/locking/mutex.c Thomas Hellstrom 2018-06-15 592 * Reset the wounded flag after a kill. No other process can 08295b3b5beec9 kernel/locking/mutex.c Thomas Hellstrom 2018-06-15 593 * race and wound us here since they can't have a valid owner 08295b3b5beec9 kernel/locking/mutex.c Thomas Hellstrom 2018-06-15 594 * pointer if we don't have any locks held. 08295b3b5beec9 kernel/locking/mutex.c Thomas Hellstrom 2018-06-15 595 */ 08295b3b5beec9 kernel/locking/mutex.c Thomas Hellstrom 2018-06-15 596 if (ww_ctx->acquired == 0) 08295b3b5beec9 kernel/locking/mutex.c Thomas Hellstrom 2018-06-15 597 ww_ctx->wounded = 0; cf702eddcd03dc kernel/locking/mutex.c Peter Zijlstra 2021-08-15 598 cf702eddcd03dc kernel/locking/mutex.c Peter Zijlstra 2021-08-15 599 #ifdef CONFIG_DEBUG_LOCK_ALLOC cf702eddcd03dc kernel/locking/mutex.c Peter Zijlstra 2021-08-15 600 nest_lock = &ww_ctx->dep_map; cf702eddcd03dc kernel/locking/mutex.c Peter Zijlstra 2021-08-15 601 #endif 0422e83d84ae24 kernel/locking/mutex.c Chris Wilson 2016-05-26 602 } 0422e83d84ae24 kernel/locking/mutex.c Chris Wilson 2016-05-26 603 41719b03091911 kernel/mutex.c Peter Zijlstra 2009-01-14 604 preempt_disable(); e4c70a6629f9c7 kernel/mutex.c Peter Zijlstra 2011-05-24 605 mutex_acquire_nest(&lock->dep_map, subclass, 0, nest_lock, ip); c02260277e4720 kernel/mutex.c Frederic Weisbecker 2009-12-02 606 dc1f7893a70fe4 kernel/locking/mutex.c Peter Zijlstra 2022-03-30 607 trace_contention_begin(lock, LCB_F_MUTEX | LCB_F_SPIN); e274795ea7b7ca kernel/locking/mutex.c Peter Zijlstra 2017-01-11 608 if (__mutex_trylock(lock) || 5de2055d31ea88 kernel/locking/mutex.c Waiman Long 2021-03-16 609 mutex_optimistic_spin(lock, ww_ctx, NULL)) { 76916515d9d84e kernel/locking/mutex.c Davidlohr Bueso 2014-07-30 610 /* got the lock, yay! */ 3ca0ff571b092e kernel/locking/mutex.c Peter Zijlstra 2016-08-23 611 lock_acquired(&lock->dep_map, ip); 5de2055d31ea88 kernel/locking/mutex.c Waiman Long 2021-03-16 612 if (ww_ctx) 3ca0ff571b092e kernel/locking/mutex.c Peter Zijlstra 2016-08-23 613 ww_mutex_set_context_fastpath(ww, ww_ctx); dc1f7893a70fe4 kernel/locking/mutex.c Peter Zijlstra 2022-03-30 614 trace_contention_end(lock, 0); ac6e60ee405aa3 kernel/mutex.c Chris Mason 2009-01-14 615 preempt_enable(); ac6e60ee405aa3 kernel/mutex.c Chris Mason 2009-01-14 616 return 0; ac6e60ee405aa3 kernel/mutex.c Chris Mason 2009-01-14 617 } ac6e60ee405aa3 kernel/mutex.c Chris Mason 2009-01-14 618 ebf4c55c1ddbab kernel/locking/mutex.c Thomas Gleixner 2021-08-15 619 raw_spin_lock(&lock->wait_lock); 1e820c9608eace kernel/locking/mutex.c Jason Low 2014-06-11 620 /* 3ca0ff571b092e kernel/locking/mutex.c Peter Zijlstra 2016-08-23 621 * After waiting to acquire the wait_lock, try again. 1e820c9608eace kernel/locking/mutex.c Jason Low 2014-06-11 622 */ 659cf9f5824a12 kernel/locking/mutex.c Nicolai Hähnle 2016-12-21 @623 if (__mutex_trylock(lock)) { 5de2055d31ea88 kernel/locking/mutex.c Waiman Long 2021-03-16 624 if (ww_ctx) 55f036ca7e74b8 kernel/locking/mutex.c Peter Ziljstra 2018-06-15 625 __ww_mutex_check_waiters(lock, ww_ctx); 659cf9f5824a12 kernel/locking/mutex.c Nicolai Hähnle 2016-12-21 626 ec83f425dbca47 kernel/mutex.c Davidlohr Bueso 2013-06-28 627 goto skip_wait; 659cf9f5824a12 kernel/locking/mutex.c Nicolai Hähnle 2016-12-21 628 } ec83f425dbca47 kernel/mutex.c Davidlohr Bueso 2013-06-28 629 9a11b49a805665 kernel/mutex.c Ingo Molnar 2006-07-03 630 debug_mutex_lock_common(lock, &waiter); c0afb0ffc06e6b kernel/locking/mutex.c Peter Zijlstra 2021-08-15 631 waiter.task = current; b857174e68e26f kernel/locking/mutex.c Sebastian Andrzej Siewior 2021-08-19 632 if (use_ww_ctx) c0afb0ffc06e6b kernel/locking/mutex.c Peter Zijlstra 2021-08-15 633 waiter.ww_ctx = ww_ctx; 6053ee3b32e343 kernel/mutex.c Ingo Molnar 2006-01-09 634 6baa5c60a97d7f kernel/locking/mutex.c Nicolai Hähnle 2016-12-21 635 lock_contended(&lock->dep_map, ip); 6053ee3b32e343 kernel/mutex.c Ingo Molnar 2006-01-09 636 6baa5c60a97d7f kernel/locking/mutex.c Nicolai Hähnle 2016-12-21 637 if (!use_ww_ctx) { 6053ee3b32e343 kernel/mutex.c Ingo Molnar 2006-01-09 638 /* add waiting tasks to the end of the waitqueue (FIFO): */ 08295b3b5beec9 kernel/locking/mutex.c Thomas Hellstrom 2018-06-15 639 __mutex_add_waiter(lock, &waiter, &lock->wait_list); 6baa5c60a97d7f kernel/locking/mutex.c Nicolai Hähnle 2016-12-21 640 } else { 55f036ca7e74b8 kernel/locking/mutex.c Peter Ziljstra 2018-06-15 641 /* 55f036ca7e74b8 kernel/locking/mutex.c Peter Ziljstra 2018-06-15 642 * Add in stamp order, waking up waiters that must kill 55f036ca7e74b8 kernel/locking/mutex.c Peter Ziljstra 2018-06-15 643 * themselves. 55f036ca7e74b8 kernel/locking/mutex.c Peter Ziljstra 2018-06-15 644 */ 6baa5c60a97d7f kernel/locking/mutex.c Nicolai Hähnle 2016-12-21 645 ret = __ww_mutex_add_waiter(&waiter, lock, ww_ctx); 6baa5c60a97d7f kernel/locking/mutex.c Nicolai Hähnle 2016-12-21 646 if (ret) 55f036ca7e74b8 kernel/locking/mutex.c Peter Ziljstra 2018-06-15 647 goto err_early_kill; 6baa5c60a97d7f kernel/locking/mutex.c Nicolai Hähnle 2016-12-21 648 } 6baa5c60a97d7f kernel/locking/mutex.c Nicolai Hähnle 2016-12-21 649 642fa448ae6b3a kernel/locking/mutex.c Davidlohr Bueso 2017-01-03 650 set_current_state(state); dc1f7893a70fe4 kernel/locking/mutex.c Peter Zijlstra 2022-03-30 651 trace_contention_begin(lock, LCB_F_MUTEX); a1ad9b2ed459a3 kernel/locking/mutex.c Pu Lehui 2025-07-16 652 cgroup_ifs_enter_lock(&ifs_clock); 6053ee3b32e343 kernel/mutex.c Ingo Molnar 2006-01-09 653 for (;;) { 048661a1f963e9 kernel/locking/mutex.c Peter Zijlstra 2021-06-30 654 bool first; 048661a1f963e9 kernel/locking/mutex.c Peter Zijlstra 2021-06-30 655 5bbd7e64437833 kernel/locking/mutex.c Peter Zijlstra 2016-09-02 656 /* 5bbd7e64437833 kernel/locking/mutex.c Peter Zijlstra 2016-09-02 657 * Once we hold wait_lock, we're serialized against 5bbd7e64437833 kernel/locking/mutex.c Peter Zijlstra 2016-09-02 658 * mutex_unlock() handing the lock off to us, do a trylock 5bbd7e64437833 kernel/locking/mutex.c Peter Zijlstra 2016-09-02 659 * before testing the error conditions to make sure we pick up 5bbd7e64437833 kernel/locking/mutex.c Peter Zijlstra 2016-09-02 660 * the handoff. 5bbd7e64437833 kernel/locking/mutex.c Peter Zijlstra 2016-09-02 661 */ e274795ea7b7ca kernel/locking/mutex.c Peter Zijlstra 2017-01-11 662 if (__mutex_trylock(lock)) 5bbd7e64437833 kernel/locking/mutex.c Peter Zijlstra 2016-09-02 663 goto acquired; 6053ee3b32e343 kernel/mutex.c Ingo Molnar 2006-01-09 664 6053ee3b32e343 kernel/mutex.c Ingo Molnar 2006-01-09 665 /* 55f036ca7e74b8 kernel/locking/mutex.c Peter Ziljstra 2018-06-15 666 * Check for signals and kill conditions while holding 5bbd7e64437833 kernel/locking/mutex.c Peter Zijlstra 2016-09-02 667 * wait_lock. This ensures the lock cancellation is ordered 5bbd7e64437833 kernel/locking/mutex.c Peter Zijlstra 2016-09-02 668 * against mutex_unlock() and wake-ups do not go missing. 6053ee3b32e343 kernel/mutex.c Ingo Molnar 2006-01-09 669 */ 3bb5f4ac55dd91 kernel/locking/mutex.c Davidlohr Bueso 2019-01-03 670 if (signal_pending_state(state, current)) { 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 671 ret = -EINTR; 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 672 goto err; 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 673 } 6053ee3b32e343 kernel/mutex.c Ingo Molnar 2006-01-09 674 5de2055d31ea88 kernel/locking/mutex.c Waiman Long 2021-03-16 675 if (ww_ctx) { 55f036ca7e74b8 kernel/locking/mutex.c Peter Ziljstra 2018-06-15 676 ret = __ww_mutex_check_kill(lock, &waiter, ww_ctx); 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 677 if (ret) 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 678 goto err; 6053ee3b32e343 kernel/mutex.c Ingo Molnar 2006-01-09 679 } 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 680 ebf4c55c1ddbab kernel/locking/mutex.c Thomas Gleixner 2021-08-15 681 raw_spin_unlock(&lock->wait_lock); bd2f55361f1834 kernel/mutex.c Thomas Gleixner 2011-03-21 682 schedule_preempt_disabled(); 9d659ae14b545c kernel/locking/mutex.c Peter Zijlstra 2016-08-23 683 6baa5c60a97d7f kernel/locking/mutex.c Nicolai Hähnle 2016-12-21 684 first = __mutex_waiter_is_first(lock, &waiter); 5bbd7e64437833 kernel/locking/mutex.c Peter Zijlstra 2016-09-02 685 642fa448ae6b3a kernel/locking/mutex.c Davidlohr Bueso 2017-01-03 686 set_current_state(state); 5bbd7e64437833 kernel/locking/mutex.c Peter Zijlstra 2016-09-02 687 /* 5bbd7e64437833 kernel/locking/mutex.c Peter Zijlstra 2016-09-02 688 * Here we order against unlock; we must either see it change 5bbd7e64437833 kernel/locking/mutex.c Peter Zijlstra 2016-09-02 689 * state back to RUNNING and fall through the next schedule(), 5bbd7e64437833 kernel/locking/mutex.c Peter Zijlstra 2016-09-02 690 * or we must see its unlock and acquire. 5bbd7e64437833 kernel/locking/mutex.c Peter Zijlstra 2016-09-02 691 */ dc1f7893a70fe4 kernel/locking/mutex.c Peter Zijlstra 2022-03-30 692 if (__mutex_trylock_or_handoff(lock, first)) dc1f7893a70fe4 kernel/locking/mutex.c Peter Zijlstra 2022-03-30 693 break; dc1f7893a70fe4 kernel/locking/mutex.c Peter Zijlstra 2022-03-30 694 dc1f7893a70fe4 kernel/locking/mutex.c Peter Zijlstra 2022-03-30 695 if (first) { dc1f7893a70fe4 kernel/locking/mutex.c Peter Zijlstra 2022-03-30 696 trace_contention_begin(lock, LCB_F_MUTEX | LCB_F_SPIN); dc1f7893a70fe4 kernel/locking/mutex.c Peter Zijlstra 2022-03-30 697 if (mutex_optimistic_spin(lock, ww_ctx, &waiter)) 5bbd7e64437833 kernel/locking/mutex.c Peter Zijlstra 2016-09-02 698 break; dc1f7893a70fe4 kernel/locking/mutex.c Peter Zijlstra 2022-03-30 699 trace_contention_begin(lock, LCB_F_MUTEX); dc1f7893a70fe4 kernel/locking/mutex.c Peter Zijlstra 2022-03-30 700 } 5bbd7e64437833 kernel/locking/mutex.c Peter Zijlstra 2016-09-02 701 ebf4c55c1ddbab kernel/locking/mutex.c Thomas Gleixner 2021-08-15 702 raw_spin_lock(&lock->wait_lock); 6053ee3b32e343 kernel/mutex.c Ingo Molnar 2006-01-09 703 } ebf4c55c1ddbab kernel/locking/mutex.c Thomas Gleixner 2021-08-15 704 raw_spin_lock(&lock->wait_lock); 5bbd7e64437833 kernel/locking/mutex.c Peter Zijlstra 2016-09-02 705 acquired: 642fa448ae6b3a kernel/locking/mutex.c Davidlohr Bueso 2017-01-03 706 __set_current_state(TASK_RUNNING); 51587bcf31d070 kernel/locking/mutex.c Davidlohr Bueso 2015-01-19 707 5de2055d31ea88 kernel/locking/mutex.c Waiman Long 2021-03-16 708 if (ww_ctx) { 08295b3b5beec9 kernel/locking/mutex.c Thomas Hellstrom 2018-06-15 709 /* 08295b3b5beec9 kernel/locking/mutex.c Thomas Hellstrom 2018-06-15 710 * Wound-Wait; we stole the lock (!first_waiter), check the 08295b3b5beec9 kernel/locking/mutex.c Thomas Hellstrom 2018-06-15 711 * waiters as anyone might want to wound us. 08295b3b5beec9 kernel/locking/mutex.c Thomas Hellstrom 2018-06-15 712 */ 08295b3b5beec9 kernel/locking/mutex.c Thomas Hellstrom 2018-06-15 713 if (!ww_ctx->is_wait_die && 08295b3b5beec9 kernel/locking/mutex.c Thomas Hellstrom 2018-06-15 714 !__mutex_waiter_is_first(lock, &waiter)) 08295b3b5beec9 kernel/locking/mutex.c Thomas Hellstrom 2018-06-15 715 __ww_mutex_check_waiters(lock, ww_ctx); 08295b3b5beec9 kernel/locking/mutex.c Thomas Hellstrom 2018-06-15 716 } 08295b3b5beec9 kernel/locking/mutex.c Thomas Hellstrom 2018-06-15 717 3a010c493271f0 kernel/locking/mutex.c Zqiang 2021-05-17 718 __mutex_remove_waiter(lock, &waiter); 3ca0ff571b092e kernel/locking/mutex.c Peter Zijlstra 2016-08-23 719 ec83f425dbca47 kernel/mutex.c Davidlohr Bueso 2013-06-28 720 debug_mutex_free_waiter(&waiter); 6053ee3b32e343 kernel/mutex.c Ingo Molnar 2006-01-09 721 ec83f425dbca47 kernel/mutex.c Davidlohr Bueso 2013-06-28 722 skip_wait: ec83f425dbca47 kernel/mutex.c Davidlohr Bueso 2013-06-28 723 /* got the lock - cleanup and rejoice! */ c7e78cff6b7518 kernel/mutex.c Peter Zijlstra 2008-10-16 724 lock_acquired(&lock->dep_map, ip); a1ad9b2ed459a3 kernel/locking/mutex.c Pu Lehui 2025-07-16 725 cgroup_ifs_leave_lock(ifs_clock, IFS_MUTEX); ee042be16cb455 kernel/locking/mutex.c Namhyung Kim 2022-03-22 726 trace_contention_end(lock, 0); 6053ee3b32e343 kernel/mutex.c Ingo Molnar 2006-01-09 727 5de2055d31ea88 kernel/locking/mutex.c Waiman Long 2021-03-16 728 if (ww_ctx) 55f036ca7e74b8 kernel/locking/mutex.c Peter Ziljstra 2018-06-15 729 ww_mutex_lock_acquired(ww, ww_ctx); 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 730 ebf4c55c1ddbab kernel/locking/mutex.c Thomas Gleixner 2021-08-15 731 raw_spin_unlock(&lock->wait_lock); 41719b03091911 kernel/mutex.c Peter Zijlstra 2009-01-14 732 preempt_enable(); 6053ee3b32e343 kernel/mutex.c Ingo Molnar 2006-01-09 733 return 0; 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 734 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 735 err: 642fa448ae6b3a kernel/locking/mutex.c Davidlohr Bueso 2017-01-03 736 __set_current_state(TASK_RUNNING); 3a010c493271f0 kernel/locking/mutex.c Zqiang 2021-05-17 737 __mutex_remove_waiter(lock, &waiter); 55f036ca7e74b8 kernel/locking/mutex.c Peter Ziljstra 2018-06-15 738 err_early_kill: a1ad9b2ed459a3 kernel/locking/mutex.c Pu Lehui 2025-07-16 739 cgroup_ifs_leave_lock(ifs_clock, IFS_MUTEX); dc1f7893a70fe4 kernel/locking/mutex.c Peter Zijlstra 2022-03-30 740 trace_contention_end(lock, ret); ebf4c55c1ddbab kernel/locking/mutex.c Thomas Gleixner 2021-08-15 741 raw_spin_unlock(&lock->wait_lock); 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 742 debug_mutex_free_waiter(&waiter); 5facae4f3549b5 kernel/locking/mutex.c Qian Cai 2019-09-19 743 mutex_release(&lock->dep_map, ip); 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 744 preempt_enable(); 040a0a37100563 kernel/mutex.c Maarten Lankhorst 2013-06-24 745 return ret; 6053ee3b32e343 kernel/mutex.c Ingo Molnar 2006-01-09 746 } 6053ee3b32e343 kernel/mutex.c Ingo Molnar 2006-01-09 747 :::::: The code at line 623 was first introduced by commit :::::: 659cf9f5824a12e6b50785e4e9cf1adf8a3adbd0 locking/ww_mutex: Optimize ww-mutexes by waking at most one waiter for backoff when acquiring the lock :::::: TO: Nicolai Hähnle <Nicolai.Haehnle@amd.com> :::::: CC: Ingo Molnar <mingo@kernel.org> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
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