Merge branch 'upstream-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid

[pandora-kernel.git] / kernel / perf_event.c

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 403d180..b98bed3 100644 (file)
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -402,11 +402,31 @@ static void perf_group_detach(struct perf_event *event)
        }
 }
 
+static inline int
+event_filter_match(struct perf_event *event)
+{
+       return event->cpu == -1 || event->cpu == smp_processor_id();
+}
+
 static void
 event_sched_out(struct perf_event *event,
                  struct perf_cpu_context *cpuctx,
                  struct perf_event_context *ctx)
 {
+       u64 delta;
+       /*
+        * An event which could not be activated because of
+        * filter mismatch still needs to have its timings
+        * maintained, otherwise bogus information is return
+        * via read() for time_enabled, time_running:
+        */
+       if (event->state == PERF_EVENT_STATE_INACTIVE
+           && !event_filter_match(event)) {
+               delta = ctx->time - event->tstamp_stopped;
+               event->tstamp_running += delta;
+               event->tstamp_stopped = ctx->time;
+       }
+
        if (event->state != PERF_EVENT_STATE_ACTIVE)
                return;
 
@@ -432,9 +452,7 @@ group_sched_out(struct perf_event *group_event,
                struct perf_event_context *ctx)
 {
        struct perf_event *event;
-
-       if (group_event->state != PERF_EVENT_STATE_ACTIVE)
-               return;
+       int state = group_event->state;
 
        event_sched_out(group_event, cpuctx, ctx);
 
@@ -444,7 +462,7 @@ group_sched_out(struct perf_event *group_event,
        list_for_each_entry(event, &group_event->sibling_list, group_entry)
                event_sched_out(event, cpuctx, ctx);
 
-       if (group_event->attr.exclusive)
+       if (state == PERF_EVENT_STATE_ACTIVE && group_event->attr.exclusive)
                cpuctx->exclusive = 0;
 }
 
@@ -2184,15 +2202,13 @@ static void perf_event_for_each(struct perf_event *event,
 static int perf_event_period(struct perf_event *event, u64 __user *arg)
 {
        struct perf_event_context *ctx = event->ctx;
-       unsigned long size;
        int ret = 0;
        u64 value;
 
        if (!event->attr.sample_period)
                return -EINVAL;
 
-       size = copy_from_user(&value, arg, sizeof(value));
-       if (size != sizeof(value))
+       if (copy_from_user(&value, arg, sizeof(value)))
                return -EFAULT;
 
        if (!value)
@@ -5743,15 +5759,15 @@ perf_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu)
 {
        unsigned int cpu = (long)hcpu;
 
-       switch (action) {
+       switch (action & ~CPU_TASKS_FROZEN) {
 
        case CPU_UP_PREPARE:
-       case CPU_UP_PREPARE_FROZEN:
+       case CPU_DOWN_FAILED:
                perf_event_init_cpu(cpu);
                break;
 
+       case CPU_UP_CANCELED:
        case CPU_DOWN_PREPARE:
-       case CPU_DOWN_PREPARE_FROZEN:
                perf_event_exit_cpu(cpu);
                break;