[ANNOUNCE] v4.14.34-rt27

From: Sebastian Andrzej Siewior
Date: Fri Apr 13 2018 - 17:52:49 EST

Dear RT folks!

I'm pleased to announce the v4.14.34-rt27 patch set.

Changes since v4.14.34-rt26:

- Two posix-timer related patches and one for the alarmtimer.

- Backported a kvm patch patch by Christoffer Dall to remove a
BUG_ON() statement which triggers on RT+arm64.

- Backported a handful patches for AMD's iommu. The series avoids
acquiring sleeping locks in atomic context on -RT. Some of patches
were made by Scott Wood.

- Inter-event (latency) fixes by Tom Zanussi.

Known issues
- A warning triggered in "rcu_note_context_switch" originated from
SyS_timer_gettime(). The issue was always there, it is now
visible. Reported by Grygorii Strashko and Daniel Wagner.

The delta patch against v4.14.34-rt26 is appended below and can be found here:

https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.14/incr/patch-4.14.34-rt26-rt27.patch.xz

You can get this release via the git tree at:

git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git v4.14.34-rt27

The RT patch against v4.14.34 can be found here:

https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.14/older/patch-4.14.34-rt27.patch.xz

The split quilt queue is available at:

https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.14/older/patches-4.14.34-rt27.tar.xz

Sebastian

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index e97eee1b2e36..b96b8c11a586 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -81,11 +81,12 @@
*/
#define AMD_IOMMU_PGSIZES ((~0xFFFUL) & ~(2ULL << 38))

-static DEFINE_RWLOCK(amd_iommu_devtable_lock);
+static DEFINE_SPINLOCK(amd_iommu_devtable_lock);
+static DEFINE_SPINLOCK(pd_bitmap_lock);
+static DEFINE_SPINLOCK(iommu_table_lock);

/* List of all available dev_data structures */
-static LIST_HEAD(dev_data_list);
-static DEFINE_SPINLOCK(dev_data_list_lock);
+static LLIST_HEAD(dev_data_list);

LIST_HEAD(ioapic_map);
LIST_HEAD(hpet_map);
@@ -204,40 +205,33 @@ static struct dma_ops_domain* to_dma_ops_domain(struct protection_domain *domain
static struct iommu_dev_data *alloc_dev_data(u16 devid)
{
struct iommu_dev_data *dev_data;
- unsigned long flags;

dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL);
if (!dev_data)
return NULL;

dev_data->devid = devid;
-
- spin_lock_irqsave(&dev_data_list_lock, flags);
- list_add_tail(&dev_data->dev_data_list, &dev_data_list);
- spin_unlock_irqrestore(&dev_data_list_lock, flags);
-
ratelimit_default_init(&dev_data->rs);

+ llist_add(&dev_data->dev_data_list, &dev_data_list);
return dev_data;
}

static struct iommu_dev_data *search_dev_data(u16 devid)
{
struct iommu_dev_data *dev_data;
- unsigned long flags;
+ struct llist_node *node;

- spin_lock_irqsave(&dev_data_list_lock, flags);
- list_for_each_entry(dev_data, &dev_data_list, dev_data_list) {
+ if (llist_empty(&dev_data_list))
+ return NULL;
+
+ node = dev_data_list.first;
+ llist_for_each_entry(dev_data, node, dev_data_list) {
if (dev_data->devid == devid)
- goto out_unlock;
+ return dev_data;
}

- dev_data = NULL;
-
-out_unlock:
- spin_unlock_irqrestore(&dev_data_list_lock, flags);
-
- return dev_data;
+ return NULL;
}

static int __last_alias(struct pci_dev *pdev, u16 alias, void *data)
@@ -311,6 +305,8 @@ static struct iommu_dev_data *find_dev_data(u16 devid)

if (dev_data == NULL) {
dev_data = alloc_dev_data(devid);
+ if (!dev_data)
+ return NULL;

if (translation_pre_enabled(iommu))
dev_data->defer_attach = true;
@@ -1054,9 +1050,9 @@ static int iommu_queue_command_sync(struct amd_iommu *iommu,
unsigned long flags;
int ret;

- spin_lock_irqsave(&iommu->lock, flags);
+ raw_spin_lock_irqsave(&iommu->lock, flags);
ret = __iommu_queue_command_sync(iommu, cmd, sync);
- spin_unlock_irqrestore(&iommu->lock, flags);
+ raw_spin_unlock_irqrestore(&iommu->lock, flags);

return ret;
}
@@ -1082,7 +1078,7 @@ static int iommu_completion_wait(struct amd_iommu *iommu)

build_completion_wait(&cmd, (u64)&iommu->cmd_sem);

- spin_lock_irqsave(&iommu->lock, flags);
+ raw_spin_lock_irqsave(&iommu->lock, flags);

iommu->cmd_sem = 0;

@@ -1093,7 +1089,7 @@ static int iommu_completion_wait(struct amd_iommu *iommu)
ret = wait_on_sem(&iommu->cmd_sem);

out_unlock:
- spin_unlock_irqrestore(&iommu->lock, flags);
+ raw_spin_unlock_irqrestore(&iommu->lock, flags);

return ret;
}
@@ -1602,29 +1598,26 @@ static void del_domain_from_list(struct protection_domain *domain)

static u16 domain_id_alloc(void)
{
- unsigned long flags;
int id;

- write_lock_irqsave(&amd_iommu_devtable_lock, flags);
+ spin_lock(&pd_bitmap_lock);
id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID);
BUG_ON(id == 0);
if (id > 0 && id < MAX_DOMAIN_ID)
__set_bit(id, amd_iommu_pd_alloc_bitmap);
else
id = 0;
- write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
+ spin_unlock(&pd_bitmap_lock);

return id;
}

static void domain_id_free(int id)
{
- unsigned long flags;
-
- write_lock_irqsave(&amd_iommu_devtable_lock, flags);
+ spin_lock(&pd_bitmap_lock);
if (id > 0 && id < MAX_DOMAIN_ID)
__clear_bit(id, amd_iommu_pd_alloc_bitmap);
- write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
+ spin_unlock(&pd_bitmap_lock);
}

#define DEFINE_FREE_PT_FN(LVL, FN) \
@@ -2093,9 +2086,9 @@ static int attach_device(struct device *dev,
}

skip_ats_check:
- write_lock_irqsave(&amd_iommu_devtable_lock, flags);
+ spin_lock_irqsave(&amd_iommu_devtable_lock, flags);
ret = __attach_device(dev_data, domain);
- write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
+ spin_unlock_irqrestore(&amd_iommu_devtable_lock, flags);

/*
* We might boot into a crash-kernel here. The crashed kernel
@@ -2145,9 +2138,9 @@ static void detach_device(struct device *dev)
domain = dev_data->domain;

/* lock device table */
- write_lock_irqsave(&amd_iommu_devtable_lock, flags);
+ spin_lock_irqsave(&amd_iommu_devtable_lock, flags);
__detach_device(dev_data);
- write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
+ spin_unlock_irqrestore(&amd_iommu_devtable_lock, flags);

if (!dev_is_pci(dev))
return;
@@ -2811,7 +2804,7 @@ static void cleanup_domain(struct protection_domain *domain)
struct iommu_dev_data *entry;
unsigned long flags;

- write_lock_irqsave(&amd_iommu_devtable_lock, flags);
+ spin_lock_irqsave(&amd_iommu_devtable_lock, flags);

while (!list_empty(&domain->dev_list)) {
entry = list_first_entry(&domain->dev_list,
@@ -2819,7 +2812,7 @@ static void cleanup_domain(struct protection_domain *domain)
__detach_device(entry);
}

- write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
+ spin_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
}

static void protection_domain_free(struct protection_domain *domain)
@@ -3586,14 +3579,62 @@ static void set_dte_irq_entry(u16 devid, struct irq_remap_table *table)
amd_iommu_dev_table[devid].data[2] = dte;
}

-static struct irq_remap_table *get_irq_table(u16 devid, bool ioapic)
+static struct irq_remap_table *get_irq_table(u16 devid)
+{
+ struct irq_remap_table *table;
+
+ if (WARN_ONCE(!amd_iommu_rlookup_table[devid],
+ "%s: no iommu for devid %x\n", __func__, devid))
+ return NULL;
+
+ table = irq_lookup_table[devid];
+ if (WARN_ONCE(!table, "%s: no table for devid %x\n", __func__, devid))
+ return NULL;
+
+ return table;
+}
+
+static struct irq_remap_table *__alloc_irq_table(void)
+{
+ struct irq_remap_table *table;
+
+ table = kzalloc(sizeof(*table), GFP_KERNEL);
+ if (!table)
+ return NULL;
+
+ table->table = kmem_cache_alloc(amd_iommu_irq_cache, GFP_KERNEL);
+ if (!table->table) {
+ kfree(table);
+ return NULL;
+ }
+ raw_spin_lock_init(&table->lock);
+
+ if (!AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir))
+ memset(table->table, 0,
+ MAX_IRQS_PER_TABLE * sizeof(u32));
+ else
+ memset(table->table, 0,
+ (MAX_IRQS_PER_TABLE * (sizeof(u64) * 2)));
+ return table;
+}
+
+static void set_remap_table_entry(struct amd_iommu *iommu, u16 devid,
+ struct irq_remap_table *table)
+{
+ irq_lookup_table[devid] = table;
+ set_dte_irq_entry(devid, table);
+ iommu_flush_dte(iommu, devid);
+}
+
+static struct irq_remap_table *alloc_irq_table(u16 devid)
{
struct irq_remap_table *table = NULL;
+ struct irq_remap_table *new_table = NULL;
struct amd_iommu *iommu;
unsigned long flags;
u16 alias;

- write_lock_irqsave(&amd_iommu_devtable_lock, flags);
+ spin_lock_irqsave(&iommu_table_lock, flags);

iommu = amd_iommu_rlookup_table[devid];
if (!iommu)
@@ -3606,60 +3647,45 @@ static struct irq_remap_table *get_irq_table(u16 devid, bool ioapic)
alias = amd_iommu_alias_table[devid];
table = irq_lookup_table[alias];
if (table) {
- irq_lookup_table[devid] = table;
- set_dte_irq_entry(devid, table);
- iommu_flush_dte(iommu, devid);
- goto out;
+ set_remap_table_entry(iommu, devid, table);
+ goto out_wait;
}
+ spin_unlock_irqrestore(&iommu_table_lock, flags);

/* Nothing there yet, allocate new irq remapping table */
- table = kzalloc(sizeof(*table), GFP_ATOMIC);
- if (!table)
+ new_table = __alloc_irq_table();
+ if (!new_table)
+ return NULL;
+
+ spin_lock_irqsave(&iommu_table_lock, flags);
+
+ table = irq_lookup_table[devid];
+ if (table)
goto out_unlock;

- /* Initialize table spin-lock */
- spin_lock_init(&table->lock);
-
- if (ioapic)
- /* Keep the first 32 indexes free for IOAPIC interrupts */
- table->min_index = 32;
-
- table->table = kmem_cache_alloc(amd_iommu_irq_cache, GFP_ATOMIC);
- if (!table->table) {
- kfree(table);
- table = NULL;
- goto out_unlock;
+ table = irq_lookup_table[alias];
+ if (table) {
+ set_remap_table_entry(iommu, devid, table);
+ goto out_wait;
}

- if (!AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir))
- memset(table->table, 0,
- MAX_IRQS_PER_TABLE * sizeof(u32));
- else
- memset(table->table, 0,
- (MAX_IRQS_PER_TABLE * (sizeof(u64) * 2)));
+ table = new_table;
+ new_table = NULL;

- if (ioapic) {
- int i;
+ set_remap_table_entry(iommu, devid, table);
+ if (devid != alias)
+ set_remap_table_entry(iommu, alias, table);

- for (i = 0; i < 32; ++i)
- iommu->irte_ops->set_allocated(table, i);
- }
-
- irq_lookup_table[devid] = table;
- set_dte_irq_entry(devid, table);
- iommu_flush_dte(iommu, devid);
- if (devid != alias) {
- irq_lookup_table[alias] = table;
- set_dte_irq_entry(alias, table);
- iommu_flush_dte(iommu, alias);
- }
-
-out:
+out_wait:
iommu_completion_wait(iommu);

out_unlock:
- write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
+ spin_unlock_irqrestore(&iommu_table_lock, flags);

+ if (new_table) {
+ kmem_cache_free(amd_iommu_irq_cache, new_table->table);
+ kfree(new_table);
+ }
return table;
}

@@ -3673,11 +3699,11 @@ static int alloc_irq_index(u16 devid, int count)
if (!iommu)
return -ENODEV;

- table = get_irq_table(devid, false);
+ table = alloc_irq_table(devid);
if (!table)
return -ENODEV;

- spin_lock_irqsave(&table->lock, flags);
+ raw_spin_lock_irqsave(&table->lock, flags);

/* Scan table for free entries */
for (c = 0, index = table->min_index;
@@ -3700,7 +3726,7 @@ static int alloc_irq_index(u16 devid, int count)
index = -ENOSPC;

out:
- spin_unlock_irqrestore(&table->lock, flags);
+ raw_spin_unlock_irqrestore(&table->lock, flags);

return index;
}
@@ -3717,11 +3743,11 @@ static int modify_irte_ga(u16 devid, int index, struct irte_ga *irte,
if (iommu == NULL)
return -EINVAL;

- table = get_irq_table(devid, false);
+ table = get_irq_table(devid);
if (!table)
return -ENOMEM;

- spin_lock_irqsave(&table->lock, flags);
+ raw_spin_lock_irqsave(&table->lock, flags);

entry = (struct irte_ga *)table->table;
entry = &entry[index];
@@ -3732,7 +3758,7 @@ static int modify_irte_ga(u16 devid, int index, struct irte_ga *irte,
if (data)
data->ref = entry;

- spin_unlock_irqrestore(&table->lock, flags);
+ raw_spin_unlock_irqrestore(&table->lock, flags);

iommu_flush_irt(iommu, devid);
iommu_completion_wait(iommu);
@@ -3750,13 +3776,13 @@ static int modify_irte(u16 devid, int index, union irte *irte)
if (iommu == NULL)
return -EINVAL;

- table = get_irq_table(devid, false);
+ table = get_irq_table(devid);
if (!table)
return -ENOMEM;

- spin_lock_irqsave(&table->lock, flags);
+ raw_spin_lock_irqsave(&table->lock, flags);
table->table[index] = irte->val;
- spin_unlock_irqrestore(&table->lock, flags);
+ raw_spin_unlock_irqrestore(&table->lock, flags);

iommu_flush_irt(iommu, devid);
iommu_completion_wait(iommu);
@@ -3774,13 +3800,13 @@ static void free_irte(u16 devid, int index)
if (iommu == NULL)
return;

- table = get_irq_table(devid, false);
+ table = get_irq_table(devid);
if (!table)
return;

- spin_lock_irqsave(&table->lock, flags);
+ raw_spin_lock_irqsave(&table->lock, flags);
iommu->irte_ops->clear_allocated(table, index);
- spin_unlock_irqrestore(&table->lock, flags);
+ raw_spin_unlock_irqrestore(&table->lock, flags);

iommu_flush_irt(iommu, devid);
iommu_completion_wait(iommu);
@@ -3861,10 +3887,8 @@ static void irte_ga_set_affinity(void *entry, u16 devid, u16 index,
u8 vector, u32 dest_apicid)
{
struct irte_ga *irte = (struct irte_ga *) entry;
- struct iommu_dev_data *dev_data = search_dev_data(devid);

- if (!dev_data || !dev_data->use_vapic ||
- !irte->lo.fields_remap.guest_mode) {
+ if (!irte->lo.fields_remap.guest_mode) {
irte->hi.fields.vector = vector;
irte->lo.fields_remap.destination = dest_apicid;
modify_irte_ga(devid, index, irte, NULL);
@@ -4070,7 +4094,7 @@ static int irq_remapping_alloc(struct irq_domain *domain, unsigned int virq,
struct amd_ir_data *data = NULL;
struct irq_cfg *cfg;
int i, ret, devid;
- int index = -1;
+ int index;

if (!info)
return -EINVAL;
@@ -4094,10 +4118,26 @@ static int irq_remapping_alloc(struct irq_domain *domain, unsigned int virq,
return ret;

if (info->type == X86_IRQ_ALLOC_TYPE_IOAPIC) {
- if (get_irq_table(devid, true))
+ struct irq_remap_table *table;
+ struct amd_iommu *iommu;
+
+ table = alloc_irq_table(devid);
+ if (table) {
+ if (!table->min_index) {
+ /*
+ * Keep the first 32 indexes free for IOAPIC
+ * interrupts.
+ */
+ table->min_index = 32;
+ iommu = amd_iommu_rlookup_table[devid];
+ for (i = 0; i < 32; ++i)
+ iommu->irte_ops->set_allocated(table, i);
+ }
+ WARN_ON(table->min_index != 32);
index = info->ioapic_pin;
- else
- ret = -ENOMEM;
+ } else {
+ index = -ENOMEM;
+ }
} else {
index = alloc_irq_index(devid, nr_irqs);
}
@@ -4341,7 +4381,7 @@ int amd_iommu_update_ga(int cpu, bool is_run, void *data)
{
unsigned long flags;
struct amd_iommu *iommu;
- struct irq_remap_table *irt;
+ struct irq_remap_table *table;
struct amd_ir_data *ir_data = (struct amd_ir_data *)data;
int devid = ir_data->irq_2_irte.devid;
struct irte_ga *entry = (struct irte_ga *) ir_data->entry;
@@ -4355,11 +4395,11 @@ int amd_iommu_update_ga(int cpu, bool is_run, void *data)
if (!iommu)
return -ENODEV;

- irt = get_irq_table(devid, false);
- if (!irt)
+ table = get_irq_table(devid);
+ if (!table)
return -ENODEV;

- spin_lock_irqsave(&irt->lock, flags);
+ raw_spin_lock_irqsave(&table->lock, flags);

if (ref->lo.fields_vapic.guest_mode) {
if (cpu >= 0)
@@ -4368,7 +4408,7 @@ int amd_iommu_update_ga(int cpu, bool is_run, void *data)
barrier();
}

- spin_unlock_irqrestore(&irt->lock, flags);
+ raw_spin_unlock_irqrestore(&table->lock, flags);

iommu_flush_irt(iommu, devid);
iommu_completion_wait(iommu);
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 6fe2d0346073..e3cd81b32a33 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1474,7 +1474,7 @@ static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
{
int ret;

- spin_lock_init(&iommu->lock);
+ raw_spin_lock_init(&iommu->lock);

/* Add IOMMU to internal data structures */
list_add_tail(&iommu->list, &amd_iommu_list);
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index f6b24c7d8b70..16b1404da58c 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -406,7 +406,7 @@ extern bool amd_iommu_iotlb_sup;
#define IRQ_TABLE_ALIGNMENT 128

struct irq_remap_table {
- spinlock_t lock;
+ raw_spinlock_t lock;
unsigned min_index;
u32 *table;
};
@@ -488,7 +488,7 @@ struct amd_iommu {
int index;

/* locks the accesses to the hardware */
- spinlock_t lock;
+ raw_spinlock_t lock;

/* Pointer to PCI device of this IOMMU */
struct pci_dev *dev;
@@ -625,7 +625,7 @@ struct devid_map {
*/
struct iommu_dev_data {
struct list_head list; /* For domain->dev_list */
- struct list_head dev_data_list; /* For global dev_data_list */
+ struct llist_node dev_data_list; /* For global dev_data_list */
struct protection_domain *domain; /* Domain the device is bound to */
u16 devid; /* PCI Device ID */
u16 alias; /* Alias Device ID */
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index 672c4f32311e..4754eb4298b1 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -101,8 +101,8 @@ struct k_itimer {
struct {
struct alarm alarmtimer;
} alarm;
- struct rcu_head rcu;
} it;
+ struct rcu_head rcu;
};

void run_posix_cpu_timers(struct task_struct *task);
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index ec09ce9a6012..ede5ef787865 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -429,7 +429,7 @@ int alarm_cancel(struct alarm *alarm)
int ret = alarm_try_to_cancel(alarm);
if (ret >= 0)
return ret;
- cpu_relax();
+ hrtimer_wait_for_timer(&alarm->timer);
}
}
EXPORT_SYMBOL_GPL(alarm_cancel);
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index f357877f0cb7..c5866984f12d 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -471,7 +471,7 @@ static struct k_itimer * alloc_posix_timer(void)

static void k_itimer_rcu_free(struct rcu_head *head)
{
- struct k_itimer *tmr = container_of(head, struct k_itimer, it.rcu);
+ struct k_itimer *tmr = container_of(head, struct k_itimer, rcu);

kmem_cache_free(posix_timers_cache, tmr);
}
@@ -488,7 +488,7 @@ static void release_posix_timer(struct k_itimer *tmr, int it_id_set)
}
put_pid(tmr->it_pid);
sigqueue_free(tmr->sigq);
- call_rcu(&tmr->it.rcu, k_itimer_rcu_free);
+ call_rcu(&tmr->rcu, k_itimer_rcu_free);
}

static int common_timer_create(struct k_itimer *new_timer)
@@ -797,20 +797,6 @@ SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id)
return overrun;
}

-/*
- * Protected by RCU!
- */
-static void timer_wait_for_callback(const struct k_clock *kc, struct k_itimer *timr)
-{
-#ifdef CONFIG_PREEMPT_RT_FULL
- if (kc->timer_set == common_timer_set)
- hrtimer_wait_for_timer(&timr->it.real.timer);
- else
- /* FIXME: Whacky hack for posix-cpu-timers */
- schedule_timeout(1);
-#endif
-}
-
static void common_hrtimer_arm(struct k_itimer *timr, ktime_t expires,
bool absolute, bool sigev_none)
{
@@ -841,6 +827,22 @@ static void common_hrtimer_arm(struct k_itimer *timr, ktime_t expires,
hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
}

+/*
+ * Protected by RCU!
+ */
+static void timer_wait_for_callback(const struct k_clock *kc, struct k_itimer *timr)
+{
+#ifdef CONFIG_PREEMPT_RT_FULL
+ if (kc->timer_arm == common_hrtimer_arm)
+ hrtimer_wait_for_timer(&timr->it.real.timer);
+ else if (kc == &alarm_clock)
+ hrtimer_wait_for_timer(&timr->it.alarm.alarmtimer.timer);
+ else
+ /* FIXME: Whacky hack for posix-cpu-timers */
+ schedule_timeout(1);
+#endif
+}
+
static int common_hrtimer_try_to_cancel(struct k_itimer *timr)
{
return hrtimer_try_to_cancel(&timr->it.real.timer);
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 49afef3cc384..37db86145c8b 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -669,7 +669,7 @@ static notrace void trace_event_raw_event_synth(void *__data,
char *str_val = (char *)(long)var_ref_vals[var_ref_idx + i];
char *str_field = (char *)&entry->fields[n_u64];

- strncpy(str_field, str_val, STR_VAR_LEN_MAX);
+ strscpy(str_field, str_val, STR_VAR_LEN_MAX);
n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
} else {
entry->fields[n_u64] = var_ref_vals[var_ref_idx + i];
@@ -1686,8 +1686,6 @@ static const char *hist_field_name(struct hist_field *field,
else if (field->flags & HIST_FIELD_FL_LOG2 ||
field->flags & HIST_FIELD_FL_ALIAS)
field_name = hist_field_name(field->operands[0], ++level);
- else if (field->flags & HIST_FIELD_FL_TIMESTAMP)
- field_name = "common_timestamp";
else if (field->flags & HIST_FIELD_FL_CPU)
field_name = "cpu";
else if (field->flags & HIST_FIELD_FL_EXPR ||
@@ -1703,7 +1701,8 @@ static const char *hist_field_name(struct hist_field *field,
field_name = full_name;
} else
field_name = field->name;
- }
+ } else if (field->flags & HIST_FIELD_FL_TIMESTAMP)
+ field_name = "common_timestamp";

if (field_name == NULL)
field_name = "";
@@ -2053,7 +2052,7 @@ static void expr_field_str(struct hist_field *field, char *expr)

strcat(expr, hist_field_name(field, 0));

- if (field->flags) {
+ if (field->flags && !(field->flags & HIST_FIELD_FL_VAR_REF)) {
const char *flags_str = get_hist_field_flags(field);

if (flags_str) {
@@ -3091,7 +3090,7 @@ static inline void __update_field_vars(struct tracing_map_elt *elt,
char *str = elt_data->field_var_str[j++];
char *val_str = (char *)(uintptr_t)var_val;

- strncpy(str, val_str, STR_VAR_LEN_MAX);
+ strscpy(str, val_str, STR_VAR_LEN_MAX);
var_val = (u64)(uintptr_t)str;
}
tracing_map_set_var(elt, var_idx, var_val);
@@ -4364,6 +4363,53 @@ static void print_onmatch_spec(struct seq_file *m,
seq_puts(m, ")");
}

+static bool actions_match(struct hist_trigger_data *hist_data,
+ struct hist_trigger_data *hist_data_test)
+{
+ unsigned int i, j;
+
+ if (hist_data->n_actions != hist_data_test->n_actions)
+ return false;
+
+ for (i = 0; i < hist_data->n_actions; i++) {
+ struct action_data *data = hist_data->actions[i];
+ struct action_data *data_test = hist_data_test->actions[i];
+
+ if (data->fn != data_test->fn)
+ return false;
+
+ if (data->n_params != data_test->n_params)
+ return false;
+
+ for (j = 0; j < data->n_params; j++) {
+ if (strcmp(data->params[j], data_test->params[j]) != 0)
+ return false;
+ }
+
+ if (data->fn == action_trace) {
+ if (strcmp(data->onmatch.synth_event_name,
+ data_test->onmatch.synth_event_name) != 0)
+ return false;
+ if (strcmp(data->onmatch.match_event_system,
+ data_test->onmatch.match_event_system) != 0)
+ return false;
+ if (strcmp(data->onmatch.match_event,
+ data_test->onmatch.match_event) != 0)
+ return false;
+ } else if (data->fn == onmax_save) {
+ if (strcmp(data->onmax.var_str,
+ data_test->onmax.var_str) != 0)
+ return false;
+ if (strcmp(data->onmax.fn_name,
+ data_test->onmax.fn_name) != 0)
+ return false;
+ }
+ }
+
+ return true;
+}
+
+
static void print_actions_spec(struct seq_file *m,
struct hist_trigger_data *hist_data)
{
@@ -4859,23 +4905,15 @@ static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
if (hist_field->var.name)
seq_printf(m, "%s=", hist_field->var.name);

- if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP)
- seq_puts(m, "common_timestamp");
- else if (hist_field->flags & HIST_FIELD_FL_CPU)
+ if (hist_field->flags & HIST_FIELD_FL_CPU)
seq_puts(m, "cpu");
else if (field_name) {
if (hist_field->flags & HIST_FIELD_FL_VAR_REF ||
hist_field->flags & HIST_FIELD_FL_ALIAS)
seq_putc(m, '$');
seq_printf(m, "%s", field_name);
- }
-
- if (hist_field->flags) {
- const char *flags_str = get_hist_field_flags(hist_field);
-
- if (flags_str)
- seq_printf(m, ".%s", flags_str);
- }
+ } else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP)
+ seq_puts(m, "common_timestamp");
}

static int event_hist_trigger_print(struct seq_file *m,
@@ -5184,6 +5222,9 @@ static bool hist_trigger_match(struct event_trigger_data *data,
(strcmp(data->filter_str, data_test->filter_str) != 0))
return false;

+ if (!actions_match(hist_data, hist_data_test))
+ return false;
+
return true;
}

diff --git a/localversion-rt b/localversion-rt
index 2e9afd4a0afd..be1e37b64ad0 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt26
+-rt27
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index 3db4af5d0197..60a3f23927d9 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -69,7 +69,6 @@ static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);

static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
{
- BUG_ON(preemptible());
__this_cpu_write(kvm_arm_running_vcpu, vcpu);
}

@@ -79,7 +78,6 @@ static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
*/
struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
{
- BUG_ON(preemptible());
return __this_cpu_read(kvm_arm_running_vcpu);
}