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Subject[ANNOUNCE] 3.18.11-rt7
Dear RT folks!

I'm pleased to announce the v3.18.11-rt7 patch set.

Changes since v3.18.11-rt6

- kvm tick optimisation by Marcelo Tosatti.

- the cpufreq driver for "AMD Opteron/Athlon64 PowerNow" is deactivated.
Ralf Mardorf reported that this responsible for a crash on his
machine. Since nobody is able to debug this, it remains off on -RT.

- Carsten Emde reported a hrtimer related deadlock in FULL_NOHZ mode.
The deadlock is workarounded by using the dedicated IRQ vector for
NOHZ callbacks.

- Mike Galbraith reworked a patch of his to get FULL_NOHZ working on
-RT (again).

- a hotplug related fix by Mike Galbraith.

Known issues:

- bcache is disabled.

- CPU hotplug works in general. Steven's test script however
deadlocks usually on the second invocation.

- xor / raid_pq
I had max latency jumping up to 67563us on one CPU while the next
lower max was 58us. I tracked it down to module's init code of
xor and raid_pq. Both disable preemption while measuring the
performance of the individual implementation.

The delta patch against 3.18.11-rt6 is appended below and can be found here:

https://www.kernel.org/pub/linux/kernel/projects/rt/3.18/incr/patch-3.18.11-rt6-rt7.patch.xz

The RT patch against 3.18.11 can be found here:

https://www.kernel.org/pub/linux/kernel/projects/rt/3.18/patch-3.18.11-rt7.patch.xz

The split quilt queue is available at:

https://www.kernel.org/pub/linux/kernel/projects/rt/3.18/patches-3.18.11-rt7.tar.xz

Sebastian

diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index fe912bc87c33..a8e32aaf0383 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -506,14 +506,12 @@ void arch_send_call_function_single_ipi(int cpu)
}

#ifdef CONFIG_IRQ_WORK
-#ifndef CONFIG_PREEMPT_RT_FULL
void arch_irq_work_raise(void)
{
if (arch_irq_work_has_interrupt())
smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
}
#endif
-#endif

#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
void tick_broadcast(const struct cpumask *mask)
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 9e193c8a959e..e71a43720a21 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -441,9 +441,9 @@ static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)

static void vcpu_pause(struct kvm_vcpu *vcpu)
{
- wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu);
+ struct swait_head *wq = kvm_arch_vcpu_wq(vcpu);

- wait_event_interruptible(*wq, !vcpu->arch.pause);
+ swait_event_interruptible(*wq, !vcpu->arch.pause);
}

static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
diff --git a/arch/arm/kvm/psci.c b/arch/arm/kvm/psci.c
index 09cf37737ee2..b26f4cb51b1e 100644
--- a/arch/arm/kvm/psci.c
+++ b/arch/arm/kvm/psci.c
@@ -66,7 +66,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
{
struct kvm *kvm = source_vcpu->kvm;
struct kvm_vcpu *vcpu = NULL, *tmp;
- wait_queue_head_t *wq;
+ struct swait_head *wq;
unsigned long cpu_id;
unsigned long context_id;
unsigned long mpidr;
@@ -123,7 +123,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
smp_mb(); /* Make sure the above is visible */

wq = kvm_arch_vcpu_wq(vcpu);
- wake_up_interruptible(wq);
+ swait_wake_interruptible(wq);

return PSCI_RET_SUCCESS;
}
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 1828a6421f60..b06d1d90ee8c 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -529,14 +529,12 @@ void arch_send_call_function_single_ipi(int cpu)
}

#ifdef CONFIG_IRQ_WORK
-#ifndef CONFIG_PREEMPT_RT_FULL
void arch_irq_work_raise(void)
{
if (__smp_cross_call)
smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
}
#endif
-#endif

static DEFINE_RAW_SPINLOCK(stop_lock);

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 047855619cc4..addfd9b99cef 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -296,7 +296,7 @@ struct kvmppc_vcore {
u8 in_guest;
struct list_head runnable_threads;
spinlock_t lock;
- wait_queue_head_t wq;
+ struct swait_head wq;
u64 stolen_tb;
u64 preempt_tb;
struct kvm_vcpu *runner;
@@ -618,7 +618,7 @@ struct kvm_vcpu_arch {
u8 prodded;
u32 last_inst;

- wait_queue_head_t *wqp;
+ struct swait_head *wqp;
struct kvmppc_vcore *vcore;
int ret;
int trap;
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 550a14dd313b..f4de021815ae 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -424,7 +424,7 @@ unsigned long profile_pc(struct pt_regs *regs)
EXPORT_SYMBOL(profile_pc);
#endif

-#if defined(CONFIG_IRQ_WORK) && !defined(CONFIG_PREEMPT_RT_FULL)
+#if defined(CONFIG_IRQ_WORK)

/*
* 64-bit uses a byte in the PACA, 32-bit uses a per-cpu variable...
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index e63587d30b70..499bc8303456 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -84,11 +84,11 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
{
int me;
int cpu = vcpu->cpu;
- wait_queue_head_t *wqp;
+ struct swait_head *wqp;

wqp = kvm_arch_vcpu_wq(vcpu);
- if (waitqueue_active(wqp)) {
- wake_up_interruptible(wqp);
+ if (swaitqueue_active(wqp)) {
+ swait_wake_interruptible(wqp);
++vcpu->stat.halt_wakeup;
}

@@ -639,8 +639,8 @@ int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
tvcpu->arch.prodded = 1;
smp_mb();
if (vcpu->arch.ceded) {
- if (waitqueue_active(&vcpu->wq)) {
- wake_up_interruptible(&vcpu->wq);
+ if (swaitqueue_active(&vcpu->wq)) {
+ swait_wake_interruptible(&vcpu->wq);
vcpu->stat.halt_wakeup++;
}
}
@@ -1357,7 +1357,7 @@ static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int core)

INIT_LIST_HEAD(&vcore->runnable_threads);
spin_lock_init(&vcore->lock);
- init_waitqueue_head(&vcore->wq);
+ init_swait_head(&vcore->wq);
vcore->preempt_tb = TB_NIL;
vcore->lpcr = kvm->arch.lpcr;
vcore->first_vcpuid = core * threads_per_subcore;
@@ -1826,13 +1826,13 @@ static void kvmppc_wait_for_exec(struct kvm_vcpu *vcpu, int wait_state)
*/
static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
{
- DEFINE_WAIT(wait);
+ DEFINE_SWAITER(wait);

- prepare_to_wait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
+ swait_prepare(&vc->wq, &wait, TASK_INTERRUPTIBLE);
vc->vcore_state = VCORE_SLEEPING;
spin_unlock(&vc->lock);
schedule();
- finish_wait(&vc->wq, &wait);
+ swait_finish(&vc->wq, &wait);
spin_lock(&vc->lock);
vc->vcore_state = VCORE_INACTIVE;
}
@@ -1873,7 +1873,7 @@ static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
kvmppc_create_dtl_entry(vcpu, vc);
kvmppc_start_thread(vcpu);
} else if (vc->vcore_state == VCORE_SLEEPING) {
- wake_up(&vc->wq);
+ swait_wake(&vc->wq);
}

}
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 2175f911a73a..884ec9b27b3c 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -311,7 +311,7 @@ struct kvm_s390_local_interrupt {
struct list_head list;
atomic_t active;
struct kvm_s390_float_interrupt *float_int;
- wait_queue_head_t *wq;
+ struct swait_head *wq;
atomic_t *cpuflags;
unsigned int action_bits;
};
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 29e2e5aa2111..e6c1cd7043df 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -619,13 +619,13 @@ int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)

void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
{
- if (waitqueue_active(&vcpu->wq)) {
+ if (swaitqueue_active(&vcpu->wq)) {
/*
* The vcpu gave up the cpu voluntarily, mark it as a good
* yield-candidate.
*/
vcpu->preempted = true;
- wake_up_interruptible(&vcpu->wq);
+ swait_wake_interruptible(&vcpu->wq);
vcpu->stat.halt_wakeup++;
}
}
@@ -746,7 +746,7 @@ int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
spin_lock(&li->lock);
list_add(&inti->list, &li->list);
atomic_set(&li->active, 1);
- BUG_ON(waitqueue_active(li->wq));
+ BUG_ON(swaitqueue_active(li->wq));
spin_unlock(&li->lock);
return 0;
}
@@ -771,7 +771,7 @@ int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
spin_lock(&li->lock);
list_add(&inti->list, &li->list);
atomic_set(&li->active, 1);
- BUG_ON(waitqueue_active(li->wq));
+ BUG_ON(swaitqueue_active(li->wq));
spin_unlock(&li->lock);
return 0;
}
diff --git a/arch/sparc/kernel/pcr.c b/arch/sparc/kernel/pcr.c
index 927d9c5e50f5..7e967c8018c8 100644
--- a/arch/sparc/kernel/pcr.c
+++ b/arch/sparc/kernel/pcr.c
@@ -43,12 +43,10 @@ void __irq_entry deferred_pcr_work_irq(int irq, struct pt_regs *regs)
set_irq_regs(old_regs);
}

-#ifndef CONFIG_PREEMPT_RT_FULL
void arch_irq_work_raise(void)
{
set_softint(1 << PIL_DEFERRED_PCR_WORK);
}
-#endif

const struct pcr_ops *pcr_ops;
EXPORT_SYMBOL_GPL(pcr_ops);
diff --git a/arch/x86/kernel/irq_work.c b/arch/x86/kernel/irq_work.c
index cbfb33df3749..15d741ddfeeb 100644
--- a/arch/x86/kernel/irq_work.c
+++ b/arch/x86/kernel/irq_work.c
@@ -38,7 +38,6 @@ __visible void smp_trace_irq_work_interrupt(struct pt_regs *regs)
exiting_irq();
}

-#ifndef CONFIG_PREEMPT_RT_FULL
void arch_irq_work_raise(void)
{
#ifdef CONFIG_X86_LOCAL_APIC
@@ -49,4 +48,3 @@ void arch_irq_work_raise(void)
apic_wait_icr_idle();
#endif
}
-#endif
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index b8345dd41b25..ca7b11e8e2d3 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1034,8 +1034,38 @@ static void update_divide_count(struct kvm_lapic *apic)
apic->divide_count);
}

+
+static enum hrtimer_restart apic_timer_fn(struct hrtimer *data);
+
+static void apic_timer_expired(struct hrtimer *data)
+{
+ int ret, i = 0;
+ enum hrtimer_restart r;
+ struct kvm_timer *ktimer = container_of(data, struct kvm_timer, timer);
+
+ r = apic_timer_fn(data);
+
+ if (r == HRTIMER_RESTART) {
+ do {
+ ret = hrtimer_start_expires(data, HRTIMER_MODE_ABS);
+ if (ret == -ETIME)
+ hrtimer_add_expires_ns(&ktimer->timer,
+ ktimer->period);
+ i++;
+ } while (ret == -ETIME && i < 10);
+
+ if (ret == -ETIME) {
+ printk_once(KERN_ERR "%s: failed to reprogram timer\n",
+ __func__);
+ WARN_ON_ONCE(1);
+ }
+ }
+}
+
+
static void start_apic_timer(struct kvm_lapic *apic)
{
+ int ret;
ktime_t now;
atomic_set(&apic->lapic_timer.pending, 0);

@@ -1065,9 +1095,11 @@ static void start_apic_timer(struct kvm_lapic *apic)
}
}

- hrtimer_start(&apic->lapic_timer.timer,
+ ret = hrtimer_start(&apic->lapic_timer.timer,
ktime_add_ns(now, apic->lapic_timer.period),
HRTIMER_MODE_ABS);
+ if (ret == -ETIME)
+ apic_timer_expired(&apic->lapic_timer.timer);

apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
PRIx64 ", "
@@ -1097,8 +1129,10 @@ static void start_apic_timer(struct kvm_lapic *apic)
ns = (tscdeadline - guest_tsc) * 1000000ULL;
do_div(ns, this_tsc_khz);
}
- hrtimer_start(&apic->lapic_timer.timer,
+ ret = hrtimer_start(&apic->lapic_timer.timer,
ktime_add_ns(now, ns), HRTIMER_MODE_ABS);
+ if (ret == -ETIME)
+ apic_timer_expired(&apic->lapic_timer.timer);

local_irq_restore(flags);
}
@@ -1539,7 +1573,7 @@ static enum hrtimer_restart apic_timer_fn(struct hrtimer *data)
struct kvm_timer *ktimer = container_of(data, struct kvm_timer, timer);
struct kvm_lapic *apic = container_of(ktimer, struct kvm_lapic, lapic_timer);
struct kvm_vcpu *vcpu = apic->vcpu;
- wait_queue_head_t *q = &vcpu->wq;
+ struct swait_head *q = &vcpu->wq;

/*
* There is a race window between reading and incrementing, but we do
@@ -1553,8 +1587,8 @@ static enum hrtimer_restart apic_timer_fn(struct hrtimer *data)
kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu);
}

- if (waitqueue_active(q))
- wake_up_interruptible(q);
+ if (swaitqueue_active(q))
+ swait_wake_interruptible(q);

if (lapic_is_periodic(apic)) {
hrtimer_add_expires_ns(&ktimer->timer, ktimer->period);
@@ -1587,6 +1621,7 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu)
hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
HRTIMER_MODE_ABS);
apic->lapic_timer.timer.function = apic_timer_fn;
+ apic->lapic_timer.timer.irqsafe = 1;

/*
* APIC is created enabled. This will prevent kvm_lapic_set_base from
@@ -1707,7 +1742,8 @@ void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)

timer = &vcpu->arch.apic->lapic_timer.timer;
if (hrtimer_cancel(timer))
- hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
+ if (hrtimer_start_expires(timer, HRTIMER_MODE_ABS) == -ETIME)
+ apic_timer_expired(timer);
}

/*
diff --git a/block/blk-mq.c b/block/blk-mq.c
index ec679b2c2229..49909ae53e50 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -194,7 +194,7 @@ static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
rq->resid_len = 0;
rq->sense = NULL;

-#if CONFIG_PREEMPT_RT_FULL
+#ifdef CONFIG_PREEMPT_RT_FULL
INIT_WORK(&rq->work, __blk_mq_complete_request_remote_work);
#endif
INIT_LIST_HEAD(&rq->timeout_list);
@@ -352,7 +352,7 @@ static void blk_mq_ipi_complete_request(struct request *rq)
shared = cpus_share_cache(cpu, ctx->cpu);

if (cpu != ctx->cpu && !shared && cpu_online(ctx->cpu)) {
-#if CONFIG_PREEMPT_RT_FULL
+#ifdef CONFIG_PREEMPT_RT_FULL
schedule_work_on(ctx->cpu, &rq->work);
#else
rq->csd.func = __blk_mq_complete_request_remote;
diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86
index 89ae88f91895..e3108a67e671 100644
--- a/drivers/cpufreq/Kconfig.x86
+++ b/drivers/cpufreq/Kconfig.x86
@@ -113,7 +113,7 @@ config X86_POWERNOW_K7_ACPI

config X86_POWERNOW_K8
tristate "AMD Opteron/Athlon64 PowerNow!"
- depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
+ depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ && !PREEMPT_RT_BASE
help
This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
Support for K10 and newer processors is now in acpi-cpufreq.
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index a6059bdf7b03..9527595fdb2d 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -244,7 +244,7 @@ struct kvm_vcpu {

int fpu_active;
int guest_fpu_loaded, guest_xcr0_loaded;
- wait_queue_head_t wq;
+ struct swait_head wq;
struct pid *pid;
int sigset_active;
sigset_t sigset;
@@ -687,7 +687,7 @@ static inline bool kvm_arch_has_noncoherent_dma(struct kvm *kvm)
}
#endif

-static inline wait_queue_head_t *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
+static inline struct swait_head *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
{
#ifdef __KVM_HAVE_ARCH_WQP
return vcpu->arch.wqp;
diff --git a/kernel/cpu.c b/kernel/cpu.c
index af677166c2a8..27f44cd27d9d 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -265,7 +265,7 @@ static int sync_unplug_thread(void *data)
* we don't want any more work on this CPU.
*/
current->flags &= ~PF_NO_SETAFFINITY;
- do_set_cpus_allowed(current, cpu_present_mask);
+ set_cpus_allowed_ptr(current, cpu_present_mask);
migrate_me();
return 0;
}
diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index 4b53470bf97b..9dda38a377bf 100644
--- a/kernel/irq_work.c
+++ b/kernel/irq_work.c
@@ -17,6 +17,7 @@
#include <linux/cpu.h>
#include <linux/notifier.h>
#include <linux/smp.h>
+#include <linux/interrupt.h>
#include <asm/processor.h>


@@ -51,11 +52,7 @@ static bool irq_work_claim(struct irq_work *work)
return true;
}

-#ifdef CONFIG_PREEMPT_RT_FULL
-void arch_irq_work_raise(void)
-#else
void __weak arch_irq_work_raise(void)
-#endif
{
/*
* Lame architectures will get the timer tick callback
@@ -118,8 +115,9 @@ bool irq_work_queue(struct irq_work *work)
if (llist_add(&work->llnode, this_cpu_ptr(&hirq_work_list)))
arch_irq_work_raise();
} else {
- if (llist_add(&work->llnode, this_cpu_ptr(&lazy_list)))
- arch_irq_work_raise();
+ if (llist_add(&work->llnode, this_cpu_ptr(&lazy_list)) &&
+ tick_nohz_tick_stopped())
+ raise_softirq(TIMER_SOFTIRQ);
}
#else
if (work->flags & IRQ_WORK_LAZY) {
@@ -203,30 +201,25 @@ static void irq_work_run_list(struct llist_head *list)
void irq_work_run(void)
{
#ifdef CONFIG_PREEMPT_RT_FULL
- if (in_irq()) {
- irq_work_run_list(this_cpu_ptr(&hirq_work_list));
- return;
- }
-#endif
+ irq_work_run_list(this_cpu_ptr(&hirq_work_list));
+#else
irq_work_run_list(this_cpu_ptr(&raised_list));
irq_work_run_list(this_cpu_ptr(&lazy_list));
+#endif
}
EXPORT_SYMBOL_GPL(irq_work_run);

void irq_work_tick(void)
{
- struct llist_head *raised;
-
#ifdef CONFIG_PREEMPT_RT_FULL
- if (in_irq()) {
- irq_work_run_list(this_cpu_ptr(&hirq_work_list));
- return;
- }
-#endif
- raised = &__get_cpu_var(raised_list);
- if (!llist_empty(raised))
+ irq_work_run_list(this_cpu_ptr(&lazy_list));
+#else
+ struct llist_head *raised = &__get_cpu_var(raised_list);
+
+ if (!llist_empty(raised) && !arch_irq_work_has_interrupt())
irq_work_run_list(raised);
irq_work_run_list(&__get_cpu_var(lazy_list));
+#endif
}

/*
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 2d2c72bb3376..f093b200d8ad 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -786,14 +786,29 @@ static inline bool got_nohz_idle_kick(void)
#endif /* CONFIG_NO_HZ_COMMON */

#ifdef CONFIG_NO_HZ_FULL
+
+static int ksoftirqd_running(void)
+{
+ struct task_struct *softirqd;
+
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT_FULL))
+ return 0;
+ softirqd = this_cpu_ksoftirqd();
+ if (softirqd && softirqd->on_rq)
+ return 1;
+ return 0;
+}
+
bool sched_can_stop_tick(void)
{
/*
* More than one running task need preemption.
* nr_running update is assumed to be visible
* after IPI is sent from wakers.
+ *
+ * NOTE, RT: if ksoftirqd is awake, subtract it.
*/
- if (this_rq()->nr_running > 1)
+ if (this_rq()->nr_running - ksoftirqd_running() > 1)
return false;

return true;
@@ -3301,6 +3316,8 @@ void rt_mutex_setprio(struct task_struct *p, int prio)
} else {
if (dl_prio(oldprio))
p->dl.dl_boosted = 0;
+ if (rt_prio(oldprio))
+ p->rt.timeout = 0;
p->sched_class = &fair_sched_class;
}

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 7405d0105892..d7cef36a443c 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -181,6 +181,11 @@ static bool can_stop_full_tick(void)
return false;
}

+ if (!arch_irq_work_has_interrupt()) {
+ trace_tick_stop(0, "missing irq work interrupt\n");
+ return false;
+ }
+
/* sched_clock_tick() needs us? */
#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
/*
@@ -222,7 +227,12 @@ void __tick_nohz_full_check(void)

static void nohz_full_kick_work_func(struct irq_work *work)
{
+ unsigned long flags;
+
+ /* ksoftirqd processes sirqs with interrupts enabled */
+ local_irq_save(flags);
__tick_nohz_full_check();
+ local_irq_restore(flags);
}

static DEFINE_PER_CPU(struct irq_work, nohz_full_kick_work) = {
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index b617b9a9400d..a29ab1a17023 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1450,9 +1450,9 @@ void update_process_times(int user_tick)
scheduler_tick();
run_local_timers();
rcu_check_callbacks(cpu, user_tick);
-#ifdef CONFIG_IRQ_WORK
- if (in_irq())
- irq_work_tick();
+
+#if defined(CONFIG_IRQ_WORK) && !defined(CONFIG_PREEMPT_RT_FULL)
+ irq_work_tick();
#endif
run_posix_cpu_timers(p);
}
diff --git a/localversion-rt b/localversion-rt
index 8fc605d80667..045478966e9f 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt6
+-rt7
diff --git a/virt/kvm/async_pf.c b/virt/kvm/async_pf.c
index 5ff7f7f2689a..1e545966ddd9 100644
--- a/virt/kvm/async_pf.c
+++ b/virt/kvm/async_pf.c
@@ -94,8 +94,8 @@ static void async_pf_execute(struct work_struct *work)

trace_kvm_async_pf_completed(addr, gva);

- if (waitqueue_active(&vcpu->wq))
- wake_up_interruptible(&vcpu->wq);
+ if (swaitqueue_active(&vcpu->wq))
+ swait_wake_interruptible(&vcpu->wq);

mmput(mm);
kvm_put_kvm(vcpu->kvm);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index cfbe0e7d1c45..06e4febc51e7 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -221,7 +221,7 @@ int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
vcpu->kvm = kvm;
vcpu->vcpu_id = id;
vcpu->pid = NULL;
- init_waitqueue_head(&vcpu->wq);
+ init_swait_head(&vcpu->wq);
kvm_async_pf_vcpu_init(vcpu);

page = alloc_page(GFP_KERNEL | __GFP_ZERO);
@@ -1740,10 +1740,10 @@ EXPORT_SYMBOL_GPL(mark_page_dirty);
*/
void kvm_vcpu_block(struct kvm_vcpu *vcpu)
{
- DEFINE_WAIT(wait);
+ DEFINE_SWAITER(wait);

for (;;) {
- prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
+ swait_prepare(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);

if (kvm_arch_vcpu_runnable(vcpu)) {
kvm_make_request(KVM_REQ_UNHALT, vcpu);
@@ -1757,7 +1757,7 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
schedule();
}

- finish_wait(&vcpu->wq, &wait);
+ swait_finish(&vcpu->wq, &wait);
}
EXPORT_SYMBOL_GPL(kvm_vcpu_block);

@@ -1769,11 +1769,11 @@ void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
{
int me;
int cpu = vcpu->cpu;
- wait_queue_head_t *wqp;
+ struct swait_head *wqp;

wqp = kvm_arch_vcpu_wq(vcpu);
- if (waitqueue_active(wqp)) {
- wake_up_interruptible(wqp);
+ if (swaitqueue_active(wqp)) {
+ swait_wake_interruptible(wqp);
++vcpu->stat.halt_wakeup;
}

@@ -1878,7 +1878,7 @@ void kvm_vcpu_on_spin(struct kvm_vcpu *me)
continue;
if (vcpu == me)
continue;
- if (waitqueue_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu))
+ if (swaitqueue_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu))
continue;
if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
continue;

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