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Groups > linux.kernel > #1446174
| From | tip-bot for Richard Weinberger <tipbot@zytor.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [tip:smp/hotplug] smp/cfd: Convert core to hotplug state machine |
| Date | 2016-07-19 09:30 +0200 |
| Message-ID | <rWxDB-15B-67@gated-at.bofh.it> (permalink) |
| References | <rUw8X-67L-55@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Commit-ID: 31487f8328f20fdb302430b020a5d6e8446c1971
Gitweb: http://git.kernel.org/tip/31487f8328f20fdb302430b020a5d6e8446c1971
Author: Richard Weinberger <richard@nod.at>
AuthorDate: Wed, 13 Jul 2016 17:17:01 +0000
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Fri, 15 Jul 2016 10:41:43 +0200
smp/cfd: Convert core to hotplug state machine
Install the callbacks via the state machine. They are installed at runtime so
smpcfd_prepare_cpu() needs to be invoked by the boot-CPU.
Signed-off-by: Richard Weinberger <richard@nod.at>
[ Added the dropped CPU dying case back in. ]
Signed-off-by: Richard Cochran <rcochran@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Davidlohr Bueso <dave@stgolabs>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153337.818376366@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
include/linux/cpuhotplug.h | 2 ++
include/linux/smp.h | 5 +++
kernel/cpu.c | 9 ++++++
kernel/smp.c | 79 +++++++++++++++++++---------------------------
4 files changed, 48 insertions(+), 47 deletions(-)
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 7817082..b5cf01a 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -18,6 +18,7 @@ enum cpuhp_state {
CPUHP_HRTIMERS_PREPARE,
CPUHP_PROFILE_PREPARE,
CPUHP_X2APIC_PREPARE,
+ CPUHP_SMPCFD_PREPARE,
CPUHP_TIMERS_DEAD,
CPUHP_NOTIFY_PREPARE,
CPUHP_BRINGUP_CPU,
@@ -57,6 +58,7 @@ enum cpuhp_state {
CPUHP_AP_ARM_CORESIGHT4_STARTING,
CPUHP_AP_ARM64_ISNDEP_STARTING,
CPUHP_AP_LEDTRIG_STARTING,
+ CPUHP_AP_SMPCFD_DYING,
CPUHP_AP_X86_TBOOT_DYING,
CPUHP_AP_NOTIFY_STARTING,
CPUHP_AP_ONLINE,
diff --git a/include/linux/smp.h b/include/linux/smp.h
index c441407..eccae469 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -196,4 +196,9 @@ extern void arch_enable_nonboot_cpus_end(void);
void smp_setup_processor_id(void);
+/* SMP core functions */
+int smpcfd_prepare_cpu(unsigned int cpu);
+int smpcfd_dead_cpu(unsigned int cpu);
+int smpcfd_dying_cpu(unsigned int cpu);
+
#endif /* __LINUX_SMP_H */
diff --git a/kernel/cpu.c b/kernel/cpu.c
index e1017d9..008e2fd 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -1195,6 +1195,11 @@ static struct cpuhp_step cpuhp_bp_states[] = {
.startup = hrtimers_prepare_cpu,
.teardown = hrtimers_dead_cpu,
},
+ [CPUHP_SMPCFD_PREPARE] = {
+ .name = "SMPCFD prepare",
+ .startup = smpcfd_prepare_cpu,
+ .teardown = smpcfd_dead_cpu,
+ },
[CPUHP_TIMERS_DEAD] = {
.name = "timers dead",
.startup = NULL,
@@ -1218,6 +1223,10 @@ 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.
diff --git a/kernel/smp.c b/kernel/smp.c
index 7416544..7180491 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());
}
/*
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[patch V2 26/67] perf/x86/amd/power: Convert the hotplug notifier to state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
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[patch V2 49/67] arm/xen: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
Re: [patch V2 49/67] arm/xen: Convert to hotplug state machine Stefano Stabellini <sstabellini@kernel.org> - 2016-07-13 20:30 +0200
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[patch V2 59/67] smp: Convert core to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
[tip:smp/hotplug] smp/cfd: Convert core to hotplug state machine tip-bot for Richard Weinberger <tipbot@zytor.com> - 2016-07-19 09:30 +0200
[patch V2 55/67] hrtimer: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
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[patch V2 28/67] workqueue: Convert to state machine callbacks Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
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[patch V2 42/67] clocksource/mips-gic: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
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[patch V2 48/67] arm/twd: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
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[patch V2 47/67] arm/l2c: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
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[patch V2 43/67] leds/trigger/cpu: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:30 +0200
Re: [patch V2 43/67] leds/trigger/cpu: Convert to hotplug state machine Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-07-14 09:20 +0200
Re: [patch V2 43/67] leds/trigger/cpu: Convert to hotplug state machine Ingo Molnar <mingo@kernel.org> - 2016-07-14 09:50 +0200
Re: [patch V2 43/67] leds/trigger/cpu: Convert to hotplug state machine Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-07-14 10:20 +0200
Re: [patch V2 43/67] leds/trigger/cpu: Convert to hotplug state machine Peter Zijlstra <peterz@infradead.org> - 2016-07-14 11:50 +0200
Re: [patch V2 43/67] leds/trigger/cpu: Convert to hotplug state machine Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-07-14 13:30 +0200
Re: [patch V2 43/67] leds/trigger/cpu: Convert to hotplug state machine Thomas Gleixner <tglx@linutronix.de> - 2016-07-14 13:40 +0200
Re: [patch V2 43/67] leds/trigger/cpu: Convert to hotplug state machine Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-07-14 14:00 +0200
Re: [patch V2 43/67] leds/trigger/cpu: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-07-15 16:20 +0200
Re: [patch V2 43/67] leds/trigger/cpu: Convert to hotplug state machine Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-07-18 10:30 +0200
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[patch V2 14/67] perf/x86/intel/rapl: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
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[patch V2 01/67] cpuhotplug: Handle early registration gracefully Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
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[patch V2 32/67] x86/kvm/kvmclock: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] x86/kvm/kvmclock: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:20 +0200
[patch V2 07/67] irqchip/bcm2836: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] irqchip/bcm2836: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:10 +0200
[patch V2 18/67] powerpc/perf: Convert book3s notifier to state machine callbacks Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] powerpc/perf: Convert book3s notifier to state machine callbacks tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2016-07-19 09:10 +0200
[patch V2 08/67] ARM: mvebu: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] ARM/mvebu: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:10 +0200
[patch V2 24/67] xtensa/perf: Convert the hotplug notifier to state machine callbacks Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] xtensa/perf: Convert the hotplug notifier to state machine callbacks tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:20 +0200
[patch V2 11/67] perf/x86/intel/uncore: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] perf/x86/intel/uncore: Convert to hotplug state machine tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2016-07-19 09:10 +0200
[patch V2 23/67] bus/arm-ccn: Convert to hotplug statemachine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
Re: [patch V2 23/67] bus/arm-ccn: Convert to hotplug statemachine Pawel Moll <pawel.moll@arm.com> - 2016-07-18 20:40 +0200
[tip:smp/hotplug] bus/arm-ccn: Convert to hotplug statemachine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:20 +0200
[patch V2 25/67] perf/x86/amd/power: Change hotplug notifier to a symmetric structure Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] perf/x86/amd/power: Change hotplug notifier to a symmetric structure tip-bot for Anna-Maria Gleixner <tipbot@zytor.com> - 2016-07-19 09:20 +0200
[patch V2 20/67] s390/perf: Convert the hotplug notifier to state machine callbacks (Sampling) Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] s390/perf: Convert the hotplug notifier to state machine callbacks (Sampling) tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:10 +0200
[patch V2 33/67] x86/apb_timer: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] x86/apb_timer: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:20 +0200
[patch V2 61/67] rcu: Convert rcutree to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] rcu: Convert rcutree to hotplug state machine tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2016-07-19 09:40 +0200
[patch V2 31/67] KVM/x86: Remove superfluous SMP function call Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
Re: [patch V2 31/67] KVM/x86: Remove superfluous SMP function call Paolo Bonzini <pbonzini@redhat.com> - 2016-07-14 10:30 +0200
[tip:smp/hotplug] KVM/x86: Remove superfluous SMP function call tip-bot for Anna-Maria Gleixner <tipbot@zytor.com> - 2016-07-19 09:20 +0200
[patch V2 09/67] perf/core: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] perf/core: Convert to hotplug state machine tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2016-07-19 09:10 +0200
[patch V2 16/67] perf/x86/intel/cstate: Convert Intel CSTATE to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] perf/x86/intel/cstate: Convert Intel CSTATE to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:10 +0200
[patch V2 22/67] bus/arm-cci: Convert to hotplug statemachine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
Re: [patch V2 22/67] bus/arm-cci: Convert to hotplug statemachine Punit Agrawal <punit.agrawal@arm.com> - 2016-07-15 14:40 +0200
[tip:smp/hotplug] bus/arm-cci: Convert to hotplug statemachine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:10 +0200
[patch V2 34/67] arm: Convert VFP hotplug notifiers to state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] arm: Convert VFP hotplug notifiers to state machine tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2016-07-19 09:20 +0200
[patch V2 36/67] virt: Convert kvm hotplug to state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] virt: Convert kvm hotplug to state machine tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2016-07-19 09:20 +0200
[patch V2 37/67] ACPI/processor: Avoid STARTING/DYING actions in a more logical way Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] ACPI/processor: Avoid STARTING/DYING actions in a more logical way tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:20 +0200
[patch V2 41/67] clocksource/qcom-timer: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] clocksource/qcom-timer: Convert to hotplug state machine tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:30 +0200
[patch V2 52/67] hwtracing/coresight-etm4x: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] hwtracing/coresight-etm4x: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:30 +0200
[patch V2 38/67] clocksource/arm_arch_timer: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] clocksource/arm_arch_timer: Convert to hotplug state machine tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:20 +0200
[patch V2 45/67] arm/kvm/arch_timer: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] arm/kvm/arch_timer: Convert to hotplug state machine tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:30 +0200
[patch V2 30/67] powerpc/numa: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Anton Blanchard <anton@samba.org> - 2016-07-14 23:50 +0200
Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-15 02:10 +0200
Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Anton Blanchard <anton@samba.org> - 2016-07-15 02:30 +0200
Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Ingo Molnar <mingo@kernel.org> - 2016-07-15 10:50 +0200
Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Anton Blanchard <anton@samba.org> - 2016-07-15 14:20 +0200
Re: [patch V2 30/67] powerpc/numa: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-07-15 18:30 +0200
[PATCH v2] powerpc/numa: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-07-18 16:10 +0200
[tip:smp/hotplug] powerpc/numa: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-22 22:00 +0200
[patch V2 46/67] metag/perf: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] metag/perf: Convert to hotplug state machine tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:30 +0200
[patch V2 57/67] profile: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] profile: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-19 09:30 +0200
[patch V2 12/67] perf/x86/amd/uncore: Convert to hotplug state machine Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-13 19:40 +0200
[tip:smp/hotplug] perf/x86/amd/uncore: Convert to hotplug state machine tip-bot for Richard Cochran <tipbot@zytor.com> - 2016-07-19 09:10 +0200
Re: [patch V2 00/67] cpuhotplug: Convert all priority notifiers to the state machine Jason Cooper <jason@lakedaemon.net> - 2016-07-13 21:40 +0200
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