user/sven/linux.git/kernel/workqueue.c, branch v4.10.3

Merge branch 'for-4.9' into for-4.10

2016-10-19T16:12:40Z

workqueue: move wq_numa_init() to workqueue_init()

2016-10-19T16:12:26Z

While splitting up workqueue initialization into two parts, ac8f73400782 ("workqueue: make workqueue available early during boot") put wq_numa_init() into workqueue_init_early(). Unfortunately, on some archs including power and arm64, cpu to node mapping isn't yet established by the time the early init is called leading to incorrect NUMA initialization and subsequently the following oops due to zero cpumask on node-specific unbound pools. Unable to handle kernel paging request for data at address 0x00000038 Faulting instruction address: 0xc0000000000fc0cc Oops: Kernel access of bad area, sig: 11 [#1] SMP NR_CPUS=2048 NUMA PowerNV Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.8.0-compiler_gcc-6.2.0-next-20161005 #94 task: c0000007f5400000 task.stack: c000001ffc084000 NIP: c0000000000fc0cc LR: c0000000000ed928 CTR: c0000000000fbfd0 REGS: c000001ffc087780 TRAP: 0300 Not tainted (4.8.0-compiler_gcc-6.2.0-next-20161005) MSR: 9000000002009033 CR: 48000424 XER: 00000000 CFAR: c0000000000089dc DAR: 0000000000000038 DSISR: 40000000 SOFTE: 0 GPR00: c0000000000ed928 c000001ffc087a00 c000000000e63200 c000000010d6d600 GPR04: c0000007f5409200 0000000000000021 000000000748e08c 000000000000001f GPR08: 0000000000000000 0000000000000021 000000000748f1f8 0000000000000000 GPR12: 0000000028000422 c00000000fb80000 c00000000000e0c8 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000021 0000000000000001 GPR20: ffffffffafb50401 0000000000000000 c000000010d6d600 000000000000ba7e GPR24: 000000000000ba7e c000000000d8bc58 afb504000afb5041 0000000000000001 GPR28: 0000000000000000 0000000000000004 c0000007f5409280 0000000000000000 NIP [c0000000000fc0cc] enqueue_task_fair+0xfc/0x18b0 LR [c0000000000ed928] activate_task+0x78/0xe0 Call Trace: [c000001ffc087a00] [c0000007f5409200] 0xc0000007f5409200 (unreliable) [c000001ffc087b10] [c0000000000ed928] activate_task+0x78/0xe0 [c000001ffc087b50] [c0000000000ede58] ttwu_do_activate+0x68/0xc0 [c000001ffc087b90] [c0000000000ef1b8] try_to_wake_up+0x208/0x4f0 [c000001ffc087c10] [c0000000000d3484] create_worker+0x144/0x250 [c000001ffc087cb0] [c000000000cd72d0] workqueue_init+0x124/0x150 [c000001ffc087d00] [c000000000cc0e74] kernel_init_freeable+0x158/0x360 [c000001ffc087dc0] [c00000000000e0e4] kernel_init+0x24/0x160 [c000001ffc087e30] [c00000000000bfa0] ret_from_kernel_thread+0x5c/0xbc Instruction dump: 62940401 3b800000 3aa00000 7f17c378 3a600001 3b600001 60000000 60000000 60420000 72490021 ebfe0150 2f890001 419e0de0 7fbee840 419e0e58 ---[ end trace 0000000000000000 ]--- Fix it by moving wq_numa_init() to workqueue_init(). As this means that the early intialization may not have full NUMA info for per-cpu pools and ignores NUMA affinity for unbound pools, fix them up from workqueue_init() after wq_numa_init(). Signed-off-by: Tejun Heo Reported-by: Michael Ellerman Link: http://lkml.kernel.org/r/87twck5wqo.fsf@concordia.ellerman.id.au Fixes: ac8f73400782 ("workqueue: make workqueue available early during boot") Signed-off-by: Tejun Heo

kthread: rename probe_kthread_data() to kthread_probe_data()

2016-10-11T22:06:33Z

Patch series "kthread: Kthread worker API improvements" The intention of this patchset is to make it easier to manipulate and maintain kthreads. Especially, I want to replace all the custom main cycles with a generic one. Also I want to make the kthreads sleep in a consistent state in a common place when there is no work. This patch (of 11): A good practice is to prefix the names of functions by the name of the subsystem. This patch fixes the name of probe_kthread_data(). The other wrong functions names are part of the kthread worker API and will be fixed separately. Link: http://lkml.kernel.org/r/1470754545-17632-2-git-send-email-pmladek@suse.com Signed-off-by: Petr Mladek Suggested-by: Andrew Morton Acked-by: Tejun Heo Cc: Oleg Nesterov Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Steven Rostedt Cc: "Paul E. McKenney" Cc: Josh Triplett Cc: Thomas Gleixner Cc: Jiri Kosina Cc: Borislav Petkov Cc: Michal Hocko Cc: Vlastimil Babka Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

workqueue: remove keventd_up()

2016-09-17T17:18:21Z

keventd_up() no longer has in-kernel users. Remove it and make wq_online static. Signed-off-by: Tejun Heo

workqueue: make workqueue available early during boot

2016-09-17T17:18:21Z

Workqueue is currently initialized in an early init call; however, there are cases where early boot code has to be split and reordered to come after workqueue initialization or the same code path which makes use of workqueues is used both before workqueue initailization and after. The latter cases have to gate workqueue usages with keventd_up() tests, which is nasty and easy to get wrong. Workqueue usages have become widespread and it'd be a lot more convenient if it can be used very early from boot. This patch splits workqueue initialization into two steps. workqueue_init_early() which sets up the basic data structures so that workqueues can be created and work items queued, and workqueue_init() which actually brings up workqueues online and starts executing queued work items. The former step can be done very early during boot once memory allocation, cpumasks and idr are initialized. The latter right after kthreads become available. This allows work item queueing and canceling from very early boot which is what most of these use cases want. * As systemd_wq being initialized doesn't indicate that workqueue is fully online anymore, update keventd_up() to test wq_online instead. The follow-up patches will get rid of all its usages and the function itself. * Flushing doesn't make sense before workqueue is fully initialized. The flush functions trigger WARN and return immediately before fully online. * Work items are never in-flight before fully online. Canceling can always succeed by skipping the flush step. * Some code paths can no longer assume to be called with irq enabled as irq is disabled during early boot. Use irqsave/restore operations instead. v2: Watchdog init, which requires timer to be running, moved from workqueue_init_early() to workqueue_init(). Signed-off-by: Tejun Heo Suggested-by: Linus Torvalds Link: http://lkml.kernel.org/r/CA+55aFx0vPuMuxn00rBSM192n-Du5uxy+4AvKa0SBSOVJeuCGg@mail.gmail.com

workqueue: dump workqueue state on sanity check failures in destroy_workqueue()

2016-09-16T15:08:39Z

destroy_workqueue() performs a number of sanity checks to ensure that the workqueue is empty before proceeding with destruction. However, it's not always easy to tell what's going on just from the warning message. Let's dump workqueue state after sanity check failures to help debugging. Signed-off-by: Tejun Heo Link: http://lkml.kernel.org/r/CACT4Y+Zs6vkjHo9qHb4TrEiz3S4+quvvVQ9VWvj2Mx6pETGb9Q@mail.gmail.com Cc: Dmitry Vyukov

workqueue: add cancel_work()

2016-08-29T14:13:21Z

Like cancel_delayed_work(), but for regular work. Signed-off-by: Jens Axboe Mehed-by: Tejun Heo Acked-by: Tejun Heo

Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2016-07-29T20:55:30Z

Pull smp hotplug updates from Thomas Gleixner: "This is the next part of the hotplug rework. - Convert all notifiers with a priority assigned - Convert all CPU_STARTING/DYING notifiers The final removal of the STARTING/DYING infrastructure will happen when the merge window closes. Another 700 hundred line of unpenetrable maze gone :)" * 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (70 commits) timers/core: Correct callback order during CPU hot plug leds/trigger/cpu: Move from CPU_STARTING to ONLINE level powerpc/numa: Convert to hotplug state machine arm/perf: Fix hotplug state machine conversion irqchip/armada: Avoid unused function warnings ARC/time: Convert to hotplug state machine clocksource/atlas7: Convert to hotplug state machine clocksource/armada-370-xp: Convert to hotplug state machine clocksource/exynos_mct: Convert to hotplug state machine clocksource/arm_global_timer: Convert to hotplug state machine rcu: Convert rcutree to hotplug state machine KVM/arm/arm64/vgic-new: Convert to hotplug state machine smp/cfd: Convert core to hotplug state machine x86/x2apic: Convert to CPU hotplug state machine profile: Convert to hotplug state machine timers/core: Convert to hotplug state machine hrtimer: Convert to hotplug state machine x86/tboot: Convert to hotplug state machine arm64/armv8 deprecated: Convert to hotplug state machine hwtracing/coresight-etm4x: Convert to hotplug state machine ...

Merge branches 'pm-sleep' and 'pm-tools'

2016-07-25T11:44:32Z

* pm-sleep: PM / hibernate: Introduce test_resume mode for hibernation x86 / hibernate: Use hlt_play_dead() when resuming from hibernation PM / hibernate: Image data protection during restoration PM / hibernate: Add missing braces in __register_nosave_region() PM / hibernate: Clean up comments in snapshot.c PM / hibernate: Clean up function headers in snapshot.c PM / hibernate: Add missing braces in hibernate_setup() PM / hibernate: Recycle safe pages after image restoration PM / hibernate: Simplify mark_unsafe_pages() PM / hibernate: Do not free preallocated safe pages during image restore PM / suspend: show workqueue state in suspend flow PM / sleep: make PM notifiers called symmetrically PM / sleep: Make pm_prepare_console() return void PM / Hibernate: Don't let kasan instrument snapshot.c * pm-tools: PM / tools: scripts: AnalyzeSuspend v4.2 tools/turbostat: allow user to alter DESTDIR and PREFIX

workqueue: Convert to state machine callbacks

2016-07-14T07:34:43Z

Get rid of the prio ordering of the separate notifiers and use a proper state callback pair. Signed-off-by: Thomas Gleixner Signed-off-by: Anna-Maria Gleixner Reviewed-by: Sebastian Andrzej Siewior Acked-by: Tejun Heo Cc: Andrew Morton Cc: Lai Jiangshan Cc: Linus Torvalds Cc: Nicolas Iooss Cc: Oleg Nesterov Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Rasmus Villemoes Cc: Rusty Russell Cc: rt@linutronix.de Link: http://lkml.kernel.org/r/20160713153335.197083890@linutronix.de Signed-off-by: Ingo Molnar