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author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-29 13:55:30 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-29 13:55:30 -0700 |
commit | a6408f6cb63ac0958fee7dbce7861ffb540d8a49 (patch) | |
tree | c94a835d343974171951e3b805e6bbbb02852ebc /kernel | |
parent | 1a81a8f2a5918956e214bb718099a89e500e7ec5 (diff) | |
parent | 4fae16dffb812f0e0d98a0b2b0856ca48ca63e6c (diff) | |
download | blackbird-op-linux-a6408f6cb63ac0958fee7dbce7861ffb540d8a49.tar.gz blackbird-op-linux-a6408f6cb63ac0958fee7dbce7861ffb540d8a49.zip |
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
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
...
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/cpu.c | 66 | ||||
-rw-r--r-- | kernel/events/core.c | 56 | ||||
-rw-r--r-- | kernel/profile.c | 181 | ||||
-rw-r--r-- | kernel/rcu/tree.c | 105 | ||||
-rw-r--r-- | kernel/smp.c | 79 | ||||
-rw-r--r-- | kernel/time/hrtimer.c | 40 | ||||
-rw-r--r-- | kernel/time/timer.c | 25 | ||||
-rw-r--r-- | kernel/workqueue.c | 108 |
8 files changed, 275 insertions, 385 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index 7b61887f7ccd..341bf80f80bd 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -517,6 +517,13 @@ static int cpuhp_invoke_ap_callback(int cpu, enum cpuhp_state state, if (!cpu_online(cpu)) return 0; + /* + * If we are up and running, use the hotplug thread. For early calls + * we invoke the thread function directly. + */ + if (!st->thread) + return cpuhp_invoke_callback(cpu, state, cb); + st->cb_state = state; st->cb = cb; /* @@ -1173,6 +1180,31 @@ static struct cpuhp_step cpuhp_bp_states[] = { .teardown = NULL, .cant_stop = true, }, + [CPUHP_PERF_PREPARE] = { + .name = "perf prepare", + .startup = perf_event_init_cpu, + .teardown = perf_event_exit_cpu, + }, + [CPUHP_WORKQUEUE_PREP] = { + .name = "workqueue prepare", + .startup = workqueue_prepare_cpu, + .teardown = NULL, + }, + [CPUHP_HRTIMERS_PREPARE] = { + .name = "hrtimers prepare", + .startup = hrtimers_prepare_cpu, + .teardown = hrtimers_dead_cpu, + }, + [CPUHP_SMPCFD_PREPARE] = { + .name = "SMPCFD prepare", + .startup = smpcfd_prepare_cpu, + .teardown = smpcfd_dead_cpu, + }, + [CPUHP_RCUTREE_PREP] = { + .name = "RCU-tree prepare", + .startup = rcutree_prepare_cpu, + .teardown = rcutree_dead_cpu, + }, /* * Preparatory and dead notifiers. Will be replaced once the notifiers * are converted to states. @@ -1184,6 +1216,16 @@ static struct cpuhp_step cpuhp_bp_states[] = { .skip_onerr = true, .cant_stop = true, }, + /* + * On the tear-down path, timers_dead_cpu() must be invoked + * before blk_mq_queue_reinit_notify() from notify_dead(), + * otherwise a RCU stall occurs. + */ + [CPUHP_TIMERS_DEAD] = { + .name = "timers dead", + .startup = NULL, + .teardown = timers_dead_cpu, + }, /* Kicks the plugged cpu into life */ [CPUHP_BRINGUP_CPU] = { .name = "cpu:bringup", @@ -1191,6 +1233,10 @@ static struct cpuhp_step cpuhp_bp_states[] = { .teardown = NULL, .cant_stop = true, }, + [CPUHP_AP_SMPCFD_DYING] = { + .startup = NULL, + .teardown = smpcfd_dying_cpu, + }, /* * Handled on controll processor until the plugged processor manages * this itself. @@ -1227,6 +1273,10 @@ static struct cpuhp_step cpuhp_ap_states[] = { .startup = sched_cpu_starting, .teardown = sched_cpu_dying, }, + [CPUHP_AP_RCUTREE_DYING] = { + .startup = NULL, + .teardown = rcutree_dying_cpu, + }, /* * Low level startup/teardown notifiers. Run with interrupts * disabled. Will be removed once the notifiers are converted to @@ -1250,6 +1300,22 @@ static struct cpuhp_step cpuhp_ap_states[] = { .startup = smpboot_unpark_threads, .teardown = NULL, }, + [CPUHP_AP_PERF_ONLINE] = { + .name = "perf online", + .startup = perf_event_init_cpu, + .teardown = perf_event_exit_cpu, + }, + [CPUHP_AP_WORKQUEUE_ONLINE] = { + .name = "workqueue online", + .startup = workqueue_online_cpu, + .teardown = workqueue_offline_cpu, + }, + [CPUHP_AP_RCUTREE_ONLINE] = { + .name = "RCU-tree online", + .startup = rcutree_online_cpu, + .teardown = rcutree_offline_cpu, + }, + /* * Online/down_prepare notifiers. Will be removed once the notifiers * are converted to states. diff --git a/kernel/events/core.c b/kernel/events/core.c index 09ae27b353c1..356a6c7cb52a 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -10357,7 +10357,7 @@ static void __init perf_event_init_all_cpus(void) } } -static void perf_event_init_cpu(int cpu) +int perf_event_init_cpu(unsigned int cpu) { struct swevent_htable *swhash = &per_cpu(swevent_htable, cpu); @@ -10370,6 +10370,7 @@ static void perf_event_init_cpu(int cpu) rcu_assign_pointer(swhash->swevent_hlist, hlist); } mutex_unlock(&swhash->hlist_mutex); + return 0; } #if defined CONFIG_HOTPLUG_CPU || defined CONFIG_KEXEC_CORE @@ -10401,14 +10402,17 @@ static void perf_event_exit_cpu_context(int cpu) } srcu_read_unlock(&pmus_srcu, idx); } +#else + +static void perf_event_exit_cpu_context(int cpu) { } + +#endif -static void perf_event_exit_cpu(int cpu) +int perf_event_exit_cpu(unsigned int cpu) { perf_event_exit_cpu_context(cpu); + return 0; } -#else -static inline void perf_event_exit_cpu(int cpu) { } -#endif static int perf_reboot(struct notifier_block *notifier, unsigned long val, void *v) @@ -10430,46 +10434,6 @@ static struct notifier_block perf_reboot_notifier = { .priority = INT_MIN, }; -static int -perf_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu) -{ - unsigned int cpu = (long)hcpu; - - switch (action & ~CPU_TASKS_FROZEN) { - - case CPU_UP_PREPARE: - /* - * This must be done before the CPU comes alive, because the - * moment we can run tasks we can encounter (software) events. - * - * Specifically, someone can have inherited events on kthreadd - * or a pre-existing worker thread that gets re-bound. - */ - perf_event_init_cpu(cpu); - break; - - case CPU_DOWN_PREPARE: - /* - * This must be done before the CPU dies because after that an - * active event might want to IPI the CPU and that'll not work - * so great for dead CPUs. - * - * XXX smp_call_function_single() return -ENXIO without a warn - * so we could possibly deal with this. - * - * This is safe against new events arriving because - * sys_perf_event_open() serializes against hotplug using - * get_online_cpus(). - */ - perf_event_exit_cpu(cpu); - break; - default: - break; - } - - return NOTIFY_OK; -} - void __init perf_event_init(void) { int ret; @@ -10482,7 +10446,7 @@ void __init perf_event_init(void) perf_pmu_register(&perf_cpu_clock, NULL, -1); perf_pmu_register(&perf_task_clock, NULL, -1); perf_tp_register(); - perf_cpu_notifier(perf_cpu_notify); + perf_event_init_cpu(smp_processor_id()); register_reboot_notifier(&perf_reboot_notifier); ret = init_hw_breakpoint(); diff --git a/kernel/profile.c b/kernel/profile.c index c2199e9901c9..2dbccf2d806c 100644 --- a/kernel/profile.c +++ b/kernel/profile.c @@ -328,68 +328,57 @@ out: put_cpu(); } -static int profile_cpu_callback(struct notifier_block *info, - unsigned long action, void *__cpu) +static int profile_dead_cpu(unsigned int cpu) { - int node, cpu = (unsigned long)__cpu; struct page *page; + int i; - switch (action) { - case CPU_UP_PREPARE: - case CPU_UP_PREPARE_FROZEN: - node = cpu_to_mem(cpu); - per_cpu(cpu_profile_flip, cpu) = 0; - if (!per_cpu(cpu_profile_hits, cpu)[1]) { - page = __alloc_pages_node(node, - GFP_KERNEL | __GFP_ZERO, - 0); - if (!page) - return notifier_from_errno(-ENOMEM); - per_cpu(cpu_profile_hits, cpu)[1] = page_address(page); - } - if (!per_cpu(cpu_profile_hits, cpu)[0]) { - page = __alloc_pages_node(node, - GFP_KERNEL | __GFP_ZERO, - 0); - if (!page) - goto out_free; - per_cpu(cpu_profile_hits, cpu)[0] = page_address(page); - } - break; -out_free: - page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[1]); - per_cpu(cpu_profile_hits, cpu)[1] = NULL; - __free_page(page); - return notifier_from_errno(-ENOMEM); - case CPU_ONLINE: - case CPU_ONLINE_FROZEN: - if (prof_cpu_mask != NULL) - cpumask_set_cpu(cpu, prof_cpu_mask); - break; - case CPU_UP_CANCELED: - case CPU_UP_CANCELED_FROZEN: - case CPU_DEAD: - case CPU_DEAD_FROZEN: - if (prof_cpu_mask != NULL) - cpumask_clear_cpu(cpu, prof_cpu_mask); - if (per_cpu(cpu_profile_hits, cpu)[0]) { - page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[0]); - per_cpu(cpu_profile_hits, cpu)[0] = NULL; + if (prof_cpu_mask != NULL) + cpumask_clear_cpu(cpu, prof_cpu_mask); + + for (i = 0; i < 2; i++) { + if (per_cpu(cpu_profile_hits, cpu)[i]) { + page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[i]); + per_cpu(cpu_profile_hits, cpu)[i] = NULL; __free_page(page); } - if (per_cpu(cpu_profile_hits, cpu)[1]) { - page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[1]); - per_cpu(cpu_profile_hits, cpu)[1] = NULL; - __free_page(page); + } + return 0; +} + +static int profile_prepare_cpu(unsigned int cpu) +{ + int i, node = cpu_to_mem(cpu); + struct page *page; + + per_cpu(cpu_profile_flip, cpu) = 0; + + for (i = 0; i < 2; i++) { + if (per_cpu(cpu_profile_hits, cpu)[i]) + continue; + + page = __alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0); + if (!page) { + profile_dead_cpu(cpu); + return -ENOMEM; } - break; + per_cpu(cpu_profile_hits, cpu)[i] = page_address(page); + } - return NOTIFY_OK; + return 0; +} + +static int profile_online_cpu(unsigned int cpu) +{ + if (prof_cpu_mask != NULL) + cpumask_set_cpu(cpu, prof_cpu_mask); + + return 0; } + #else /* !CONFIG_SMP */ #define profile_flip_buffers() do { } while (0) #define profile_discard_flip_buffers() do { } while (0) -#define profile_cpu_callback NULL static void do_profile_hits(int type, void *__pc, unsigned int nr_hits) { @@ -531,83 +520,43 @@ static const struct file_operations proc_profile_operations = { .llseek = default_llseek, }; -#ifdef CONFIG_SMP -static void profile_nop(void *unused) -{ -} - -static int create_hash_tables(void) +int __ref create_proc_profile(void) { - int cpu; - - for_each_online_cpu(cpu) { - int node = cpu_to_mem(cpu); - struct page *page; - - page = __alloc_pages_node(node, - GFP_KERNEL | __GFP_ZERO | __GFP_THISNODE, - 0); - if (!page) - goto out_cleanup; - per_cpu(cpu_profile_hits, cpu)[1] - = (struct profile_hit *)page_address(page); - page = __alloc_pages_node(node, - GFP_KERNEL | __GFP_ZERO | __GFP_THISNODE, - 0); - if (!page) - goto out_cleanup; - per_cpu(cpu_profile_hits, cpu)[0] - = (struct profile_hit *)page_address(page); - } - return 0; -out_cleanup: - prof_on = 0; - smp_mb(); - on_each_cpu(profile_nop, NULL, 1); - for_each_online_cpu(cpu) { - struct page *page; - - if (per_cpu(cpu_profile_hits, cpu)[0]) { - page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[0]); - per_cpu(cpu_profile_hits, cpu)[0] = NULL; - __free_page(page); - } - if (per_cpu(cpu_profile_hits, cpu)[1]) { - page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[1]); - per_cpu(cpu_profile_hits, cpu)[1] = NULL; - __free_page(page); - } - } - return -1; -} -#else -#define create_hash_tables() ({ 0; }) + struct proc_dir_entry *entry; +#ifdef CONFIG_SMP + enum cpuhp_state online_state; #endif -int __ref create_proc_profile(void) /* false positive from hotcpu_notifier */ -{ - struct proc_dir_entry *entry; int err = 0; if (!prof_on) return 0; - - cpu_notifier_register_begin(); - - if (create_hash_tables()) { - err = -ENOMEM; - goto out; - } - +#ifdef CONFIG_SMP + err = cpuhp_setup_state(CPUHP_PROFILE_PREPARE, "PROFILE_PREPARE", + profile_prepare_cpu, profile_dead_cpu); + if (err) + return err; + + err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "AP_PROFILE_ONLINE", + profile_online_cpu, NULL); + if (err < 0) + goto err_state_prep; + online_state = err; + err = 0; +#endif entry = proc_create("profile", S_IWUSR | S_IRUGO, NULL, &proc_profile_operations); if (!entry) - goto out; + goto err_state_onl; proc_set_size(entry, (1 + prof_len) * sizeof(atomic_t)); - __hotcpu_notifier(profile_cpu_callback, 0); -out: - cpu_notifier_register_done(); + return err; +err_state_onl: +#ifdef CONFIG_SMP + cpuhp_remove_state(online_state); +err_state_prep: + cpuhp_remove_state(CPUHP_PROFILE_PREPARE); +#endif return err; } subsys_initcall(create_proc_profile); diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index f433959e9322..5d80925e7fc8 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1073,11 +1073,11 @@ EXPORT_SYMBOL_GPL(rcu_is_watching); * offline to continue to use RCU for one jiffy after marking itself * offline in the cpu_online_mask. This leniency is necessary given the * non-atomic nature of the online and offline processing, for example, - * the fact that a CPU enters the scheduler after completing the CPU_DYING - * notifiers. + * the fact that a CPU enters the scheduler after completing the teardown + * of the CPU. * - * This is also why RCU internally marks CPUs online during the - * CPU_UP_PREPARE phase and offline during the CPU_DEAD phase. + * This is also why RCU internally marks CPUs online during in the + * preparation phase and offline after the CPU has been taken down. * * Disable checking if in an NMI handler because we cannot safely report * errors from NMI handlers anyway. @@ -3806,12 +3806,58 @@ rcu_init_percpu_data(int cpu, struct rcu_state *rsp) raw_spin_unlock_irqrestore_rcu_node(rnp, flags); } -static void rcu_prepare_cpu(int cpu) +int rcutree_prepare_cpu(unsigned int cpu) { struct rcu_state *rsp; for_each_rcu_flavor(rsp) rcu_init_percpu_data(cpu, rsp); + + rcu_prepare_kthreads(cpu); + rcu_spawn_all_nocb_kthreads(cpu); + + return 0; +} + +static void rcutree_affinity_setting(unsigned int cpu, int outgoing) +{ + struct rcu_data *rdp = per_cpu_ptr(rcu_state_p->rda, cpu); + + rcu_boost_kthread_setaffinity(rdp->mynode, outgoing); +} + +int rcutree_online_cpu(unsigned int cpu) +{ + sync_sched_exp_online_cleanup(cpu); + rcutree_affinity_setting(cpu, -1); + return 0; +} + +int rcutree_offline_cpu(unsigned int cpu) +{ + rcutree_affinity_setting(cpu, cpu); + return 0; +} + + +int rcutree_dying_cpu(unsigned int cpu) +{ + struct rcu_state *rsp; + + for_each_rcu_flavor(rsp) + rcu_cleanup_dying_cpu(rsp); + return 0; +} + +int rcutree_dead_cpu(unsigned int cpu) +{ + struct rcu_state *rsp; + + for_each_rcu_flavor(rsp) { + rcu_cleanup_dead_cpu(cpu, rsp); + do_nocb_deferred_wakeup(per_cpu_ptr(rsp->rda, cpu)); + } + return 0; } #ifdef CONFIG_HOTPLUG_CPU @@ -3851,52 +3897,6 @@ void rcu_report_dead(unsigned int cpu) } #endif -/* - * Handle CPU online/offline notification events. - */ -int rcu_cpu_notify(struct notifier_block *self, - unsigned long action, void *hcpu) -{ - long cpu = (long)hcpu; - struct rcu_data *rdp = per_cpu_ptr(rcu_state_p->rda, cpu); - struct rcu_node *rnp = rdp->mynode; - struct rcu_state *rsp; - - switch (action) { - case CPU_UP_PREPARE: - case CPU_UP_PREPARE_FROZEN: - rcu_prepare_cpu(cpu); - rcu_prepare_kthreads(cpu); - rcu_spawn_all_nocb_kthreads(cpu); - break; - case CPU_ONLINE: - case CPU_DOWN_FAILED: - sync_sched_exp_online_cleanup(cpu); - rcu_boost_kthread_setaffinity(rnp, -1); - break; - case CPU_DOWN_PREPARE: - rcu_boost_kthread_setaffinity(rnp, cpu); - break; - case CPU_DYING: - case CPU_DYING_FROZEN: - for_each_rcu_flavor(rsp) - rcu_cleanup_dying_cpu(rsp); - break; - case CPU_DEAD: - case CPU_DEAD_FROZEN: - case CPU_UP_CANCELED: - case CPU_UP_CANCELED_FROZEN: - for_each_rcu_flavor(rsp) { - rcu_cleanup_dead_cpu(cpu, rsp); - do_nocb_deferred_wakeup(per_cpu_ptr(rsp->rda, cpu)); - } - break; - default: - break; - } - return NOTIFY_OK; -} - static int rcu_pm_notify(struct notifier_block *self, unsigned long action, void *hcpu) { @@ -4208,10 +4208,9 @@ void __init rcu_init(void) * this is called early in boot, before either interrupts * or the scheduler are operational. */ - cpu_notifier(rcu_cpu_notify, 0); pm_notifier(rcu_pm_notify, 0); for_each_online_cpu(cpu) - rcu_cpu_notify(NULL, CPU_UP_PREPARE, (void *)(long)cpu); + rcutree_prepare_cpu(cpu); } #include "tree_exp.h" diff --git a/kernel/smp.c b/kernel/smp.c index 36552beed397..3aa642d39c03 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -33,69 +33,54 @@ static DEFINE_PER_CPU_SHARED_ALIGNED(struct llist_head, call_single_queue); static void flush_smp_call_function_queue(bool warn_cpu_offline); -static int -hotplug_cfd(struct notifier_block *nfb, unsigned long action, void *hcpu) +int smpcfd_prepare_cpu(unsigned int cpu) { - long cpu = (long)hcpu; struct call_function_data *cfd = &per_cpu(cfd_data, cpu); - switch (action) { - case CPU_UP_PREPARE: - case CPU_UP_PREPARE_FROZEN: - if (!zalloc_cpumask_var_node(&cfd->cpumask, GFP_KERNEL, - cpu_to_node(cpu))) - return notifier_from_errno(-ENOMEM); - cfd->csd = alloc_percpu(struct call_single_data); - if (!cfd->csd) { - free_cpumask_var(cfd->cpumask); - return notifier_from_errno(-ENOMEM); - } - break; - -#ifdef CONFIG_HOTPLUG_CPU - case CPU_UP_CANCELED: - case CPU_UP_CANCELED_FROZEN: - /* Fall-through to the CPU_DEAD[_FROZEN] case. */ - - case CPU_DEAD: - case CPU_DEAD_FROZEN: + if (!zalloc_cpumask_var_node(&cfd->cpumask, GFP_KERNEL, + cpu_to_node(cpu))) + return -ENOMEM; + cfd->csd = alloc_percpu(struct call_single_data); + if (!cfd->csd) { free_cpumask_var(cfd->cpumask); - free_percpu(cfd->csd); - break; + return -ENOMEM; + } - case CPU_DYING: - case CPU_DYING_FROZEN: - /* - * The IPIs for the smp-call-function callbacks queued by other - * CPUs might arrive late, either due to hardware latencies or - * because this CPU disabled interrupts (inside stop-machine) - * before the IPIs were sent. So flush out any pending callbacks - * explicitly (without waiting for the IPIs to arrive), to - * ensure that the outgoing CPU doesn't go offline with work - * still pending. - */ - flush_smp_call_function_queue(false); - break; -#endif - }; + return 0; +} + +int smpcfd_dead_cpu(unsigned int cpu) +{ + struct call_function_data *cfd = &per_cpu(cfd_data, cpu); - return NOTIFY_OK; + free_cpumask_var(cfd->cpumask); + free_percpu(cfd->csd); + return 0; } -static struct notifier_block hotplug_cfd_notifier = { - .notifier_call = hotplug_cfd, -}; +int smpcfd_dying_cpu(unsigned int cpu) +{ + /* + * The IPIs for the smp-call-function callbacks queued by other + * CPUs might arrive late, either due to hardware latencies or + * because this CPU disabled interrupts (inside stop-machine) + * before the IPIs were sent. So flush out any pending callbacks + * explicitly (without waiting for the IPIs to arrive), to + * ensure that the outgoing CPU doesn't go offline with work + * still pending. + */ + flush_smp_call_function_queue(false); + return 0; +} void __init call_function_init(void) { - void *cpu = (void *)(long)smp_processor_id(); int i; for_each_possible_cpu(i) init_llist_head(&per_cpu(call_single_queue, i)); - hotplug_cfd(&hotplug_cfd_notifier, CPU_UP_PREPARE, cpu); - register_cpu_notifier(&hotplug_cfd_notifier); + smpcfd_prepare_cpu(smp_processor_id()); } /* diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c index d13c9aebf7a3..9ba7c820fc23 100644 --- a/kernel/time/hrtimer.c +++ b/kernel/time/hrtimer.c @@ -1590,7 +1590,7 @@ SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp, /* * Functions related to boot-time initialization: */ -static void init_hrtimers_cpu(int cpu) +int hrtimers_prepare_cpu(unsigned int cpu) { struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu); int i; @@ -1602,6 +1602,7 @@ static void init_hrtimers_cpu(int cpu) cpu_base->cpu = cpu; hrtimer_init_hres(cpu_base); + return 0; } #ifdef CONFIG_HOTPLUG_CPU @@ -1636,7 +1637,7 @@ static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base, } } -static void migrate_hrtimers(int scpu) +int hrtimers_dead_cpu(unsigned int scpu) { struct hrtimer_cpu_base *old_base, *new_base; int i; @@ -1665,45 +1666,14 @@ static void migrate_hrtimers(int scpu) /* Check, if we got expired work to do */ __hrtimer_peek_ahead_timers(); local_irq_enable(); + return 0; } #endif /* CONFIG_HOTPLUG_CPU */ -static int hrtimer_cpu_notify(struct notifier_block *self, - unsigned long action, void *hcpu) -{ - int scpu = (long)hcpu; - - switch (action) { - - case CPU_UP_PREPARE: - case CPU_UP_PREPARE_FROZEN: - init_hrtimers_cpu(scpu); - break; - -#ifdef CONFIG_HOTPLUG_CPU - case CPU_DEAD: - case CPU_DEAD_FROZEN: - migrate_hrtimers(scpu); - break; -#endif - - default: - break; - } - - return NOTIFY_OK; -} - -static struct notifier_block hrtimers_nb = { - .notifier_call = hrtimer_cpu_notify, -}; - void __init hrtimers_init(void) { - hrtimer_cpu_notify(&hrtimers_nb, (unsigned long)CPU_UP_PREPARE, - (void *)(long)smp_processor_id()); - register_cpu_notifier(&hrtimers_nb); + hrtimers_prepare_cpu(smp_processor_id()); } /** diff --git a/kernel/time/timer.c b/kernel/time/timer.c index cb9ab401e2d9..555670a5143c 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -1804,7 +1804,7 @@ static void migrate_timer_list(struct timer_base *new_base, struct hlist_head *h } } -static void migrate_timers(int cpu) +int timers_dead_cpu(unsigned int cpu) { struct timer_base *old_base; struct timer_base *new_base; @@ -1831,29 +1831,9 @@ static void migrate_timers(int cpu) spin_unlock_irq(&new_base->lock); put_cpu_ptr(&timer_bases); } + return 0; } -static int timer_cpu_notify(struct notifier_block *self, - unsigned long action, void *hcpu) -{ - switch (action) { - case CPU_DEAD: - case CPU_DEAD_FROZEN: - migrate_timers((long)hcpu); - break; - default: - break; - } - - return NOTIFY_OK; -} - -static inline void timer_register_cpu_notifier(void) -{ - cpu_notifier(timer_cpu_notify, 0); -} -#else -static inline void timer_register_cpu_notifier(void) { } #endif /* CONFIG_HOTPLUG_CPU */ static void __init init_timer_cpu(int cpu) @@ -1881,7 +1861,6 @@ void __init init_timers(void) { init_timer_cpus(); init_timer_stats(); - timer_register_cpu_notifier(); open_softirq(TIMER_SOFTIRQ, run_timer_softirq); } diff --git a/kernel/workqueue.c b/kernel/workqueue.c index d12bd958077e..ef071ca73fc3 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -4607,84 +4607,65 @@ static void restore_unbound_workers_cpumask(struct worker_pool *pool, int cpu) WARN_ON_ONCE(set_cpus_allowed_ptr(worker->task, &cpumask) < 0); } -/* - * Workqueues should be brought up before normal priority CPU notifiers. - * This will be registered high priority CPU notifier. - */ -static int workqueue_cpu_up_callback(struct notifier_block *nfb, - unsigned long action, - void *hcpu) +int workqueue_prepare_cpu(unsigned int cpu) +{ + struct worker_pool *pool; + + for_each_cpu_worker_pool(pool, cpu) { + if (pool->nr_workers) + continue; + if (!create_worker(pool)) + return -ENOMEM; + } + return 0; +} + +int workqueue_online_cpu(unsigned int cpu) { - int cpu = (unsigned long)hcpu; struct worker_pool *pool; struct workqueue_struct *wq; int pi; - switch (action & ~CPU_TASKS_FROZEN) { - case CPU_UP_PREPARE: - for_each_cpu_worker_pool(pool, cpu) { - if (pool->nr_workers) - continue; - if (!create_worker(pool)) - return NOTIFY_BAD; - } - break; - - case CPU_DOWN_FAILED: - case CPU_ONLINE: - mutex_lock(&wq_pool_mutex); + mutex_lock(&wq_pool_mutex); - for_each_pool(pool, pi) { - mutex_lock(&pool->attach_mutex); + for_each_pool(pool, pi) { + mutex_lock(&pool->attach_mutex); - if (pool->cpu == cpu) - rebind_workers(pool); - else if (pool->cpu < 0) - restore_unbound_workers_cpumask(pool, cpu); + if (pool->cpu == cpu) + rebind_workers(pool); + else if (pool->cpu < 0) + restore_unbound_workers_cpumask(pool, cpu); - mutex_unlock(&pool->attach_mutex); - } + mutex_unlock(&pool->attach_mutex); + } - /* update NUMA affinity of unbound workqueues */ - list_for_each_entry(wq, &workqueues, list) - wq_update_unbound_numa(wq, cpu, true); + /* update NUMA affinity of unbound workqueues */ + list_for_each_entry(wq, &workqueues, list) + wq_update_unbound_numa(wq, cpu, true); - mutex_unlock(&wq_pool_mutex); - break; - } - return NOTIFY_OK; + mutex_unlock(&wq_pool_mutex); + return 0; } -/* - * Workqueues should be brought down after normal priority CPU notifiers. - * This will be registered as low priority CPU notifier. - */ -static int workqueue_cpu_down_callback(struct notifier_block *nfb, - unsigned long action, - void *hcpu) +int workqueue_offline_cpu(unsigned int cpu) { - int cpu = (unsigned long)hcpu; struct work_struct unbind_work; struct workqueue_struct *wq; - switch (action & ~CPU_TASKS_FROZEN) { - case CPU_DOWN_PREPARE: - /* unbinding per-cpu workers should happen on the local CPU */ - INIT_WORK_ONSTACK(&unbind_work, wq_unbind_fn); - queue_work_on(cpu, system_highpri_wq, &unbind_work); - - /* update NUMA affinity of unbound workqueues */ - mutex_lock(&wq_pool_mutex); - list_for_each_entry(wq, &workqueues, list) - wq_update_unbound_numa(wq, cpu, false); - mutex_unlock(&wq_pool_mutex); - - /* wait for per-cpu unbinding to finish */ - flush_work(&unbind_work); - destroy_work_on_stack(&unbind_work); - break; - } - return NOTIFY_OK; + /* unbinding per-cpu workers should happen on the local CPU */ + INIT_WORK_ONSTACK(&unbind_work, wq_unbind_fn); + queue_work_on(cpu, system_highpri_wq, &unbind_work); + + /* update NUMA affinity of unbound workqueues */ + mutex_lock(&wq_pool_mutex); + list_for_each_entry(wq, &workqueues, list) + wq_update_unbound_numa(wq, cpu, false); + mutex_unlock(&wq_pool_mutex); + + /* wait for per-cpu unbinding to finish */ + flush_work(&unbind_work); + destroy_work_on_stack(&unbind_work); + return 0; } #ifdef CONFIG_SMP @@ -5486,9 +5467,6 @@ static int __init init_workqueues(void) pwq_cache = KMEM_CACHE(pool_workqueue, SLAB_PANIC); - cpu_notifier(workqueue_cpu_up_callback, CPU_PRI_WORKQUEUE_UP); - hotcpu_notifier(workqueue_cpu_down_callback, CPU_PRI_WORKQUEUE_DOWN); - wq_numa_init(); /* initialize CPU pools */ |