tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: d3fde8ff50ab265749704bd7fbcf70d35235421f commit: e449c388913ccd36641f7cc0c335029a7cc161f4 [13472/14198] workqueue: Wrap flush_workqueue() using an inline function config: x86_64-randconfig-a014-20220530 (https://download.01.org/0day-ci/archive/20220530/202205301443.2n5yYq7Y-lkp@xxxxxxxxx/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0776c48f9b7e69fa447bee57c7c0985caa856be9) 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://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=e449c388913ccd36641f7cc0c335029a7cc161f4 git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout e449c388913ccd36641f7cc0c335029a7cc161f4 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): In file included from drivers/gpu/drm/i915/display/intel_display.c:28: In file included from include/linux/i2c.h:13: In file included from include/linux/acpi.h:13: In file included from include/linux/irqdomain.h:35: In file included from include/linux/of.h:17: In file included from include/linux/kobject.h:20: In file included from include/linux/sysfs.h:16: In file included from include/linux/kernfs.h:12: In file included from include/linux/idr.h:15: In file included from include/linux/radix-tree.h:12: In file included from include/linux/gfp.h:6: In file included from include/linux/mmzone.h:21: In file included from include/linux/mm_types.h:18: >> include/linux/workqueue.h:610:2: error: call to __warn_flushing_systemwide_wq declared with 'warning' attribute: Please avoid flushing system-wide workqueues. [-Werror,-Wattribute-warning] __warn_flushing_systemwide_wq(); ^ 1 error generated. vim +/warning +610 include/linux/workqueue.h 565 566 /* 567 * Detect attempt to flush system-wide workqueues at compile time when possible. 568 * 569 * See https://lkml.kernel.org/r/49925af7-78a8-a3dd-bce6-cfc02e1a9236@xxxxxxxxxxxxxxxxxxx 570 * for reasons and steps for converting system-wide workqueues into local workqueues. 571 */ 572 extern void __warn_flushing_systemwide_wq(void) 573 __compiletime_warning("Please avoid flushing system-wide workqueues."); 574 575 /** 576 * flush_scheduled_work - ensure that any scheduled work has run to completion. 577 * 578 * Forces execution of the kernel-global workqueue and blocks until its 579 * completion. 580 * 581 * It's very easy to get into trouble if you don't take great care. 582 * Either of the following situations will lead to deadlock: 583 * 584 * One of the work items currently on the workqueue needs to acquire 585 * a lock held by your code or its caller. 586 * 587 * Your code is running in the context of a work routine. 588 * 589 * They will be detected by lockdep when they occur, but the first might not 590 * occur very often. It depends on what work items are on the workqueue and 591 * what locks they need, which you have no control over. 592 * 593 * In most situations flushing the entire workqueue is overkill; you merely 594 * need to know that a particular work item isn't queued and isn't running. 595 * In such cases you should use cancel_delayed_work_sync() or 596 * cancel_work_sync() instead. 597 * 598 * Please stop calling this function! A conversion to stop flushing system-wide 599 * workqueues is in progress. This function will be removed after all in-tree 600 * users stopped calling this function. 601 */ 602 static inline void flush_scheduled_work(void) 603 { 604 #if !defined(CONFIG_WERROR) && defined(CONFIG_PROVE_LOCKING) 605 /* 606 * Warn only if emitting warning message does not cause build failure 607 * and the developer wants warning about possibility of deadlock, for 608 * there are currently in-tree flush_scheduled_work() users. 609 */ > 610 __warn_flushing_systemwide_wq(); 611 #endif 612 __flush_workqueue(system_wq); 613 } 614 -- 0-DAY CI Kernel Test Service https://01.org/lkp
