Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull perf fixes from Ingo Molnar:
 "Three fixlets and two small (and low risk) hw-enablement changes"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf: Fix event group context move
  x86/perf: Add IvyBridge EP support
  perf/x86: Fix P6 driver section warning
  arch/x86/tools/insn_sanity.c: Identify source of messages
  perf/x86: Enable Intel Lincroft/Penwell/Cloverview Atom support

1 files changed, 18 insertions, 2 deletions

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 301079d06f24..7b6646a8c067 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -908,6 +908,15 @@ list_add_event(struct perf_event *event, struct perf_event_context *ctx)
 }
 
 /*
+ * Initialize event state based on the perf_event_attr::disabled.
+ */
+static inline void perf_event__state_init(struct perf_event *event)
+{
+        event->state = event->attr.disabled ? PERF_EVENT_STATE_OFF :
+                                              PERF_EVENT_STATE_INACTIVE;
+}
+
+/*
  * Called at perf_event creation and when events are attached/detached from a
  * group.
  */
@@ -6179,8 +6188,7 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
         event->overflow_handler = overflow_handler;
         event->overflow_handler_context = context;
 
-        if (attr->disabled)
-                event->state = PERF_EVENT_STATE_OFF;
+        perf_event__state_init(event);
 
         pmu = NULL;
 
@@ -6609,9 +6617,17 @@ SYSCALL_DEFINE5(perf_event_open,
 
                 mutex_lock(&gctx->mutex);
                 perf_remove_from_context(group_leader);
+
+                /*
+                 * Removing from the context ends up with disabled
+                 * event. What we want here is event in the initial
+                 * startup state, ready to be add into new context.
+                 */
+                perf_event__state_init(group_leader);
                 list_for_each_entry(sibling, &group_leader->sibling_list,
                                     group_entry) {
                         perf_remove_from_context(sibling);
+                        perf_event__state_init(sibling);
                         put_ctx(gctx);
                 }
                 mutex_unlock(&gctx->mutex);