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authorDavid S. Miller <davem@davemloft.net>2019-04-17 11:26:25 -0700
committerDavid S. Miller <davem@davemloft.net>2019-04-17 11:26:25 -0700
commit6b0a7f84ea1fe248df96ccc4dd86e817e32ef65b (patch)
tree0a7976054052e793da782c2b7ec34eccfbf66449 /kernel
parentcea0aa9cbd5ad4efe267e9487ed5d48d16756253 (diff)
parentfe5cdef29e41c8bda8cd1a11545e7c6bfe25570e (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Conflict resolution of af_smc.c from Stephen Rothwell. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/dma/debug.c2
-rw-r--r--kernel/events/core.c52
-rw-r--r--kernel/events/ring_buffer.c4
-rw-r--r--kernel/irq/chip.c4
-rw-r--r--kernel/irq/irqdesc.c1
-rw-r--r--kernel/locking/lockdep.c29
-rw-r--r--kernel/sched/fair.c6
-rw-r--r--kernel/time/alarmtimer.c2
-rw-r--r--kernel/trace/trace.c6
9 files changed, 72 insertions, 34 deletions
diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
index 45d51e8e26f6..a218e43cc382 100644
--- a/kernel/dma/debug.c
+++ b/kernel/dma/debug.c
@@ -706,7 +706,7 @@ static struct dma_debug_entry *dma_entry_alloc(void)
#ifdef CONFIG_STACKTRACE
entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES;
entry->stacktrace.entries = entry->st_entries;
- entry->stacktrace.skip = 2;
+ entry->stacktrace.skip = 1;
save_stack_trace(&entry->stacktrace);
#endif
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 72d06e302e99..534e01e7bc36 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2009,8 +2009,8 @@ event_sched_out(struct perf_event *event,
event->pmu->del(event, 0);
event->oncpu = -1;
- if (event->pending_disable) {
- event->pending_disable = 0;
+ if (READ_ONCE(event->pending_disable) >= 0) {
+ WRITE_ONCE(event->pending_disable, -1);
state = PERF_EVENT_STATE_OFF;
}
perf_event_set_state(event, state);
@@ -2198,7 +2198,8 @@ EXPORT_SYMBOL_GPL(perf_event_disable);
void perf_event_disable_inatomic(struct perf_event *event)
{
- event->pending_disable = 1;
+ WRITE_ONCE(event->pending_disable, smp_processor_id());
+ /* can fail, see perf_pending_event_disable() */
irq_work_queue(&event->pending);
}
@@ -5810,10 +5811,45 @@ void perf_event_wakeup(struct perf_event *event)
}
}
+static void perf_pending_event_disable(struct perf_event *event)
+{
+ int cpu = READ_ONCE(event->pending_disable);
+
+ if (cpu < 0)
+ return;
+
+ if (cpu == smp_processor_id()) {
+ WRITE_ONCE(event->pending_disable, -1);
+ perf_event_disable_local(event);
+ return;
+ }
+
+ /*
+ * CPU-A CPU-B
+ *
+ * perf_event_disable_inatomic()
+ * @pending_disable = CPU-A;
+ * irq_work_queue();
+ *
+ * sched-out
+ * @pending_disable = -1;
+ *
+ * sched-in
+ * perf_event_disable_inatomic()
+ * @pending_disable = CPU-B;
+ * irq_work_queue(); // FAILS
+ *
+ * irq_work_run()
+ * perf_pending_event()
+ *
+ * But the event runs on CPU-B and wants disabling there.
+ */
+ irq_work_queue_on(&event->pending, cpu);
+}
+
static void perf_pending_event(struct irq_work *entry)
{
- struct perf_event *event = container_of(entry,
- struct perf_event, pending);
+ struct perf_event *event = container_of(entry, struct perf_event, pending);
int rctx;
rctx = perf_swevent_get_recursion_context();
@@ -5822,10 +5858,7 @@ static void perf_pending_event(struct irq_work *entry)
* and we won't recurse 'further'.
*/
- if (event->pending_disable) {
- event->pending_disable = 0;
- perf_event_disable_local(event);
- }
+ perf_pending_event_disable(event);
if (event->pending_wakeup) {
event->pending_wakeup = 0;
@@ -10236,6 +10269,7 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
init_waitqueue_head(&event->waitq);
+ event->pending_disable = -1;
init_irq_work(&event->pending, perf_pending_event);
mutex_init(&event->mmap_mutex);
diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index a4047321d7d8..2545ac08cc77 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -392,7 +392,7 @@ void *perf_aux_output_begin(struct perf_output_handle *handle,
* store that will be enabled on successful return
*/
if (!handle->size) { /* A, matches D */
- event->pending_disable = 1;
+ event->pending_disable = smp_processor_id();
perf_output_wakeup(handle);
local_set(&rb->aux_nest, 0);
goto err_put;
@@ -480,7 +480,7 @@ void perf_aux_output_end(struct perf_output_handle *handle, unsigned long size)
if (wakeup) {
if (handle->aux_flags & PERF_AUX_FLAG_TRUNCATED)
- handle->event->pending_disable = 1;
+ handle->event->pending_disable = smp_processor_id();
perf_output_wakeup(handle);
}
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 3faef4a77f71..51128bea3846 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -1449,6 +1449,10 @@ int irq_chip_set_vcpu_affinity_parent(struct irq_data *data, void *vcpu_info)
int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on)
{
data = data->parent_data;
+
+ if (data->chip->flags & IRQCHIP_SKIP_SET_WAKE)
+ return 0;
+
if (data->chip->irq_set_wake)
return data->chip->irq_set_wake(data, on);
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 13539e12cd80..9f8a709337cf 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -558,6 +558,7 @@ int __init early_irq_init(void)
alloc_masks(&desc[i], node);
raw_spin_lock_init(&desc[i].lock);
lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
+ mutex_init(&desc[i].request_mutex);
desc_set_defaults(i, &desc[i], node, NULL, NULL);
}
return arch_early_irq_init();
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 34cdcbedda49..e16766ff184b 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -4689,8 +4689,8 @@ static void free_zapped_rcu(struct rcu_head *ch)
return;
raw_local_irq_save(flags);
- if (!graph_lock())
- goto out_irq;
+ arch_spin_lock(&lockdep_lock);
+ current->lockdep_recursion = 1;
/* closed head */
pf = delayed_free.pf + (delayed_free.index ^ 1);
@@ -4702,8 +4702,8 @@ static void free_zapped_rcu(struct rcu_head *ch)
*/
call_rcu_zapped(delayed_free.pf + delayed_free.index);
- graph_unlock();
-out_irq:
+ current->lockdep_recursion = 0;
+ arch_spin_unlock(&lockdep_lock);
raw_local_irq_restore(flags);
}
@@ -4744,21 +4744,17 @@ static void lockdep_free_key_range_reg(void *start, unsigned long size)
{
struct pending_free *pf;
unsigned long flags;
- int locked;
init_data_structures_once();
raw_local_irq_save(flags);
- locked = graph_lock();
- if (!locked)
- goto out_irq;
-
+ arch_spin_lock(&lockdep_lock);
+ current->lockdep_recursion = 1;
pf = get_pending_free();
__lockdep_free_key_range(pf, start, size);
call_rcu_zapped(pf);
-
- graph_unlock();
-out_irq:
+ current->lockdep_recursion = 0;
+ arch_spin_unlock(&lockdep_lock);
raw_local_irq_restore(flags);
/*
@@ -4911,9 +4907,8 @@ void lockdep_unregister_key(struct lock_class_key *key)
return;
raw_local_irq_save(flags);
- if (!graph_lock())
- goto out_irq;
-
+ arch_spin_lock(&lockdep_lock);
+ current->lockdep_recursion = 1;
pf = get_pending_free();
hlist_for_each_entry_rcu(k, hash_head, hash_entry) {
if (k == key) {
@@ -4925,8 +4920,8 @@ void lockdep_unregister_key(struct lock_class_key *key)
WARN_ON_ONCE(!found);
__lockdep_free_key_range(pf, key, 1);
call_rcu_zapped(pf);
- graph_unlock();
-out_irq:
+ current->lockdep_recursion = 0;
+ arch_spin_unlock(&lockdep_lock);
raw_local_irq_restore(flags);
/* Wait until is_dynamic_key() has finished accessing k->hash_entry. */
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index fdab7eb6f351..40bd1e27b1b7 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7784,10 +7784,10 @@ static void update_cfs_rq_h_load(struct cfs_rq *cfs_rq)
if (cfs_rq->last_h_load_update == now)
return;
- cfs_rq->h_load_next = NULL;
+ WRITE_ONCE(cfs_rq->h_load_next, NULL);
for_each_sched_entity(se) {
cfs_rq = cfs_rq_of(se);
- cfs_rq->h_load_next = se;
+ WRITE_ONCE(cfs_rq->h_load_next, se);
if (cfs_rq->last_h_load_update == now)
break;
}
@@ -7797,7 +7797,7 @@ static void update_cfs_rq_h_load(struct cfs_rq *cfs_rq)
cfs_rq->last_h_load_update = now;
}
- while ((se = cfs_rq->h_load_next) != NULL) {
+ while ((se = READ_ONCE(cfs_rq->h_load_next)) != NULL) {
load = cfs_rq->h_load;
load = div64_ul(load * se->avg.load_avg,
cfs_rq_load_avg(cfs_rq) + 1);
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 2c97e8c2d29f..0519a8805aab 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -594,7 +594,7 @@ static ktime_t alarm_timer_remaining(struct k_itimer *timr, ktime_t now)
{
struct alarm *alarm = &timr->it.alarm.alarmtimer;
- return ktime_sub(now, alarm->node.expires);
+ return ktime_sub(alarm->node.expires, now);
}
/**
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 21153e64bf1c..6c24755655c7 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -7041,12 +7041,16 @@ static void buffer_pipe_buf_release(struct pipe_inode_info *pipe,
buf->private = 0;
}
-static void buffer_pipe_buf_get(struct pipe_inode_info *pipe,
+static bool buffer_pipe_buf_get(struct pipe_inode_info *pipe,
struct pipe_buffer *buf)
{
struct buffer_ref *ref = (struct buffer_ref *)buf->private;
+ if (ref->ref > INT_MAX/2)
+ return false;
+
ref->ref++;
+ return true;
}
/* Pipe buffer operations for a buffer. */