perf_event: Convert to raw_spinlock

Convert locks which cannot be sleeping locks in preempt-rt to
raw_spinlocks.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 53 insertions, 53 deletions

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index e73e53c7582f..9052d6c8c9fd 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -203,14 +203,14 @@ perf_lock_task_context(struct task_struct *task, unsigned long *flags)
                  * if so.  If we locked the right context, then it
                  * can't get swapped on us any more.
                  */
-                spin_lock_irqsave(&ctx->lock, *flags);
+                raw_spin_lock_irqsave(&ctx->lock, *flags);
                 if (ctx != rcu_dereference(task->perf_event_ctxp)) {
-                        spin_unlock_irqrestore(&ctx->lock, *flags);
+                        raw_spin_unlock_irqrestore(&ctx->lock, *flags);
                         goto retry;
                 }
 
                 if (!atomic_inc_not_zero(&ctx->refcount)) {
-                        spin_unlock_irqrestore(&ctx->lock, *flags);
+                        raw_spin_unlock_irqrestore(&ctx->lock, *flags);
                         ctx = NULL;
                 }
         }
@@ -231,7 +231,7 @@ static struct perf_event_context *perf_pin_task_context(struct task_struct *task
         ctx = perf_lock_task_context(task, &flags);
         if (ctx) {
                 ++ctx->pin_count;
-                spin_unlock_irqrestore(&ctx->lock, flags);
+                raw_spin_unlock_irqrestore(&ctx->lock, flags);
         }
         return ctx;
 }
@@ -240,9 +240,9 @@ static void perf_unpin_context(struct perf_event_context *ctx)
 {
         unsigned long flags;
 
-        spin_lock_irqsave(&ctx->lock, flags);
+        raw_spin_lock_irqsave(&ctx->lock, flags);
         --ctx->pin_count;
-        spin_unlock_irqrestore(&ctx->lock, flags);
+        raw_spin_unlock_irqrestore(&ctx->lock, flags);
         put_ctx(ctx);
 }
 
@@ -427,7 +427,7 @@ static void __perf_event_remove_from_context(void *info)
         if (ctx->task && cpuctx->task_ctx != ctx)
                 return;
 
-        spin_lock(&ctx->lock);
+        raw_spin_lock(&ctx->lock);
         /*
          * Protect the list operation against NMI by disabling the
          * events on a global level.
@@ -449,7 +449,7 @@ static void __perf_event_remove_from_context(void *info)
         }
 
         perf_enable();
-        spin_unlock(&ctx->lock);
+        raw_spin_unlock(&ctx->lock);
 }
 
 
@@ -488,12 +488,12 @@ retry:
         task_oncpu_function_call(task, __perf_event_remove_from_context,
                                  event);
 
-        spin_lock_irq(&ctx->lock);
+        raw_spin_lock_irq(&ctx->lock);
         /*
          * If the context is active we need to retry the smp call.
          */
         if (ctx->nr_active && !list_empty(&event->group_entry)) {
-                spin_unlock_irq(&ctx->lock);
+                raw_spin_unlock_irq(&ctx->lock);
                 goto retry;
         }
 
@@ -504,7 +504,7 @@ retry:
          */
         if (!list_empty(&event->group_entry))
                 list_del_event(event, ctx);
-        spin_unlock_irq(&ctx->lock);
+        raw_spin_unlock_irq(&ctx->lock);
 }
 
 /*
@@ -535,7 +535,7 @@ static void __perf_event_disable(void *info)
         if (ctx->task && cpuctx->task_ctx != ctx)
                 return;
 
-        spin_lock(&ctx->lock);
+        raw_spin_lock(&ctx->lock);
 
         /*
          * If the event is on, turn it off.
@@ -551,7 +551,7 @@ static void __perf_event_disable(void *info)
                 event->state = PERF_EVENT_STATE_OFF;
         }
 
-        spin_unlock(&ctx->lock);
+        raw_spin_unlock(&ctx->lock);
 }
 
 /*
@@ -584,12 +584,12 @@ void perf_event_disable(struct perf_event *event)
  retry:
         task_oncpu_function_call(task, __perf_event_disable, event);
 
-        spin_lock_irq(&ctx->lock);
+        raw_spin_lock_irq(&ctx->lock);
         /*
          * If the event is still active, we need to retry the cross-call.
          */
         if (event->state == PERF_EVENT_STATE_ACTIVE) {
-                spin_unlock_irq(&ctx->lock);
+                raw_spin_unlock_irq(&ctx->lock);
                 goto retry;
         }
 
@@ -602,7 +602,7 @@ void perf_event_disable(struct perf_event *event)
                 event->state = PERF_EVENT_STATE_OFF;
         }
 
-        spin_unlock_irq(&ctx->lock);
+        raw_spin_unlock_irq(&ctx->lock);
 }
 
 static int
@@ -770,7 +770,7 @@ static void __perf_install_in_context(void *info)
                 cpuctx->task_ctx = ctx;
         }
 
-        spin_lock(&ctx->lock);
+        raw_spin_lock(&ctx->lock);
         ctx->is_active = 1;
         update_context_time(ctx);
 
@@ -820,7 +820,7 @@ static void __perf_install_in_context(void *info)
  unlock:
         perf_enable();
 
-        spin_unlock(&ctx->lock);
+        raw_spin_unlock(&ctx->lock);
 }
 
 /*
@@ -856,12 +856,12 @@ retry:
         task_oncpu_function_call(task, __perf_install_in_context,
                                  event);
 
-        spin_lock_irq(&ctx->lock);
+        raw_spin_lock_irq(&ctx->lock);
         /*
          * we need to retry the smp call.
          */
         if (ctx->is_active && list_empty(&event->group_entry)) {
-                spin_unlock_irq(&ctx->lock);
+                raw_spin_unlock_irq(&ctx->lock);
                 goto retry;
         }
 
@@ -872,7 +872,7 @@ retry:
          */
         if (list_empty(&event->group_entry))
                 add_event_to_ctx(event, ctx);
-        spin_unlock_irq(&ctx->lock);
+        raw_spin_unlock_irq(&ctx->lock);
 }
 
 /*
@@ -917,7 +917,7 @@ static void __perf_event_enable(void *info)
                 cpuctx->task_ctx = ctx;
         }
 
-        spin_lock(&ctx->lock);
+        raw_spin_lock(&ctx->lock);
         ctx->is_active = 1;
         update_context_time(ctx);
 
@@ -959,7 +959,7 @@ static void __perf_event_enable(void *info)
         }
 
  unlock:
-        spin_unlock(&ctx->lock);
+        raw_spin_unlock(&ctx->lock);
 }
 
 /*
@@ -985,7 +985,7 @@ void perf_event_enable(struct perf_event *event)
                 return;
         }
 
-        spin_lock_irq(&ctx->lock);
+        raw_spin_lock_irq(&ctx->lock);
         if (event->state >= PERF_EVENT_STATE_INACTIVE)
                 goto out;
 
@@ -1000,10 +1000,10 @@ void perf_event_enable(struct perf_event *event)
                 event->state = PERF_EVENT_STATE_OFF;
 
  retry:
-        spin_unlock_irq(&ctx->lock);
+        raw_spin_unlock_irq(&ctx->lock);
         task_oncpu_function_call(task, __perf_event_enable, event);
 
-        spin_lock_irq(&ctx->lock);
+        raw_spin_lock_irq(&ctx->lock);
 
         /*
          * If the context is active and the event is still off,
@@ -1020,7 +1020,7 @@ void perf_event_enable(struct perf_event *event)
                 __perf_event_mark_enabled(event, ctx);
 
  out:
-        spin_unlock_irq(&ctx->lock);
+        raw_spin_unlock_irq(&ctx->lock);
 }
 
 static int perf_event_refresh(struct perf_event *event, int refresh)
@@ -1042,7 +1042,7 @@ void __perf_event_sched_out(struct perf_event_context *ctx,
 {
         struct perf_event *event;
 
-        spin_lock(&ctx->lock);
+        raw_spin_lock(&ctx->lock);
         ctx->is_active = 0;
         if (likely(!ctx->nr_events))
                 goto out;
@@ -1055,7 +1055,7 @@ void __perf_event_sched_out(struct perf_event_context *ctx,
         }
         perf_enable();
  out:
-        spin_unlock(&ctx->lock);
+        raw_spin_unlock(&ctx->lock);
 }
 
 /*
@@ -1193,8 +1193,8 @@ void perf_event_task_sched_out(struct task_struct *task,
                  * order we take the locks because no other cpu could
                  * be trying to lock both of these tasks.
                  */
-                spin_lock(&ctx->lock);
-                spin_lock_nested(&next_ctx->lock, SINGLE_DEPTH_NESTING);
+                raw_spin_lock(&ctx->lock);
+                raw_spin_lock_nested(&next_ctx->lock, SINGLE_DEPTH_NESTING);
                 if (context_equiv(ctx, next_ctx)) {
                         /*
                          * XXX do we need a memory barrier of sorts
@@ -1208,8 +1208,8 @@ void perf_event_task_sched_out(struct task_struct *task,
 
                         perf_event_sync_stat(ctx, next_ctx);
                 }
-                spin_unlock(&next_ctx->lock);
-                spin_unlock(&ctx->lock);
+                raw_spin_unlock(&next_ctx->lock);
+                raw_spin_unlock(&ctx->lock);
         }
         rcu_read_unlock();
 
@@ -1251,7 +1251,7 @@ __perf_event_sched_in(struct perf_event_context *ctx,
         struct perf_event *event;
         int can_add_hw = 1;
 
-        spin_lock(&ctx->lock);
+        raw_spin_lock(&ctx->lock);
         ctx->is_active = 1;
         if (likely(!ctx->nr_events))
                 goto out;
@@ -1306,7 +1306,7 @@ __perf_event_sched_in(struct perf_event_context *ctx,
         }
         perf_enable();
  out:
-        spin_unlock(&ctx->lock);
+        raw_spin_unlock(&ctx->lock);
 }
 
 /*
@@ -1370,7 +1370,7 @@ static void perf_ctx_adjust_freq(struct perf_event_context *ctx)
         struct hw_perf_event *hwc;
         u64 interrupts, freq;
 
-        spin_lock(&ctx->lock);
+        raw_spin_lock(&ctx->lock);
         list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {
                 if (event->state != PERF_EVENT_STATE_ACTIVE)
                         continue;
@@ -1425,7 +1425,7 @@ static void perf_ctx_adjust_freq(struct perf_event_context *ctx)
                         perf_enable();
                 }
         }
-        spin_unlock(&ctx->lock);
+        raw_spin_unlock(&ctx->lock);
 }
 
 /*
@@ -1438,7 +1438,7 @@ static void rotate_ctx(struct perf_event_context *ctx)
         if (!ctx->nr_events)
                 return;
 
-        spin_lock(&ctx->lock);
+        raw_spin_lock(&ctx->lock);
         /*
          * Rotate the first entry last (works just fine for group events too):
          */
@@ -1449,7 +1449,7 @@ static void rotate_ctx(struct perf_event_context *ctx)
         }
         perf_enable();
 
-        spin_unlock(&ctx->lock);
+        raw_spin_unlock(&ctx->lock);
 }
 
 void perf_event_task_tick(struct task_struct *curr, int cpu)
@@ -1498,7 +1498,7 @@ static void perf_event_enable_on_exec(struct task_struct *task)
 
         __perf_event_task_sched_out(ctx);
 
-        spin_lock(&ctx->lock);
+        raw_spin_lock(&ctx->lock);
 
         list_for_each_entry(event, &ctx->group_list, group_entry) {
                 if (!event->attr.enable_on_exec)
@@ -1516,7 +1516,7 @@ static void perf_event_enable_on_exec(struct task_struct *task)
         if (enabled)
                 unclone_ctx(ctx);
 
-        spin_unlock(&ctx->lock);
+        raw_spin_unlock(&ctx->lock);
 
         perf_event_task_sched_in(task, smp_processor_id());
  out:
@@ -1542,10 +1542,10 @@ static void __perf_event_read(void *info)
         if (ctx->task && cpuctx->task_ctx != ctx)
                 return;
 
-        spin_lock(&ctx->lock);
+        raw_spin_lock(&ctx->lock);
         update_context_time(ctx);
         update_event_times(event);
-        spin_unlock(&ctx->lock);
+        raw_spin_unlock(&ctx->lock);
 
         event->pmu->read(event);
 }
@@ -1563,10 +1563,10 @@ static u64 perf_event_read(struct perf_event *event)
                 struct perf_event_context *ctx = event->ctx;
                 unsigned long flags;
 
-                spin_lock_irqsave(&ctx->lock, flags);
+                raw_spin_lock_irqsave(&ctx->lock, flags);
                 update_context_time(ctx);
                 update_event_times(event);
-                spin_unlock_irqrestore(&ctx->lock, flags);
+                raw_spin_unlock_irqrestore(&ctx->lock, flags);
         }
 
         return atomic64_read(&event->count);
@@ -1579,7 +1579,7 @@ static void
 __perf_event_init_context(struct perf_event_context *ctx,
                             struct task_struct *task)
 {
-        spin_lock_init(&ctx->lock);
+        raw_spin_lock_init(&ctx->lock);
         mutex_init(&ctx->mutex);
         INIT_LIST_HEAD(&ctx->group_list);
         INIT_LIST_HEAD(&ctx->event_list);
@@ -1649,7 +1649,7 @@ static struct perf_event_context *find_get_context(pid_t pid, int cpu)
         ctx = perf_lock_task_context(task, &flags);
         if (ctx) {
                 unclone_ctx(ctx);
-                spin_unlock_irqrestore(&ctx->lock, flags);
+                raw_spin_unlock_irqrestore(&ctx->lock, flags);
         }
 
         if (!ctx) {
@@ -1987,7 +1987,7 @@ static int perf_event_period(struct perf_event *event, u64 __user *arg)
         if (!value)
                 return -EINVAL;
 
-        spin_lock_irq(&ctx->lock);
+        raw_spin_lock_irq(&ctx->lock);
         if (event->attr.freq) {
                 if (value > sysctl_perf_event_sample_rate) {
                         ret = -EINVAL;
@@ -2000,7 +2000,7 @@ static int perf_event_period(struct perf_event *event, u64 __user *arg)
                 event->hw.sample_period = value;
         }
 unlock:
-        spin_unlock_irq(&ctx->lock);
+        raw_spin_unlock_irq(&ctx->lock);
 
         return ret;
 }
@@ -4992,7 +4992,7 @@ void perf_event_exit_task(struct task_struct *child)
          * reading child->perf_event_ctxp, we wait until it has
          * incremented the context's refcount before we do put_ctx below.
          */
-        spin_lock(&child_ctx->lock);
+        raw_spin_lock(&child_ctx->lock);
         child->perf_event_ctxp = NULL;
         /*
          * If this context is a clone; unclone it so it can't get
@@ -5001,7 +5001,7 @@ void perf_event_exit_task(struct task_struct *child)
          */
         unclone_ctx(child_ctx);
         update_context_time(child_ctx);
-        spin_unlock_irqrestore(&child_ctx->lock, flags);
+        raw_spin_unlock_irqrestore(&child_ctx->lock, flags);
 
         /*
          * Report the task dead after unscheduling the events so that we
@@ -5292,11 +5292,11 @@ perf_set_reserve_percpu(struct sysdev_class *class,
         perf_reserved_percpu = val;
         for_each_online_cpu(cpu) {
                 cpuctx = &per_cpu(perf_cpu_context, cpu);
-                spin_lock_irq(&cpuctx->ctx.lock);
+                raw_spin_lock_irq(&cpuctx->ctx.lock);
                 mpt = min(perf_max_events - cpuctx->ctx.nr_events,
                           perf_max_events - perf_reserved_percpu);
                 cpuctx->max_pertask = mpt;
-                spin_unlock_irq(&cpuctx->ctx.lock);
+                raw_spin_unlock_irq(&cpuctx->ctx.lock);
         }
         spin_unlock(&perf_resource_lock);