Merge branch 'linus' into tracing/core

Merge reason: update to upstream tracing facilities

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 11 insertions, 2 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index c7f4a4be05dc..678e3d6caf85 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -928,9 +928,14 @@ void ftrace_release(void *start, unsigned long size)
 
         mutex_lock(&ftrace_lock);
         do_for_each_ftrace_rec(pg, rec) {
-                if ((rec->ip >= s) && (rec->ip < e) &&
-                    !(rec->flags & FTRACE_FL_FREE))
+                if ((rec->ip >= s) && (rec->ip < e)) {
+                        /*
+                         * rec->ip is changed in ftrace_free_rec()
+                         * It should not between s and e if record was freed.
+                         */
+                        FTRACE_WARN_ON(rec->flags & FTRACE_FL_FREE);
                         ftrace_free_rec(rec);
+                }
         } while_for_each_ftrace_rec();
         mutex_unlock(&ftrace_lock);
 }
@@ -3287,6 +3292,9 @@ void unregister_ftrace_graph(void)
 {
         mutex_lock(&ftrace_lock);
 
+        if (!unlikely(atomic_read(&ftrace_graph_active)))
+                goto out;
+
         atomic_dec(&ftrace_graph_active);
         unregister_trace_sched_switch(ftrace_graph_probe_sched_switch);
         ftrace_graph_return = (trace_func_graph_ret_t)ftrace_stub;
@@ -3294,6 +3302,7 @@ void unregister_ftrace_graph(void)
         ftrace_shutdown(FTRACE_STOP_FUNC_RET);
         unregister_pm_notifier(&ftrace_suspend_notifier);
 
+ out:
         mutex_unlock(&ftrace_lock);
 }