ftrace: Avoid synchronize_rcu_tasks_rude() call when not necessary

[platform/kernel/linux-rpi.git] / kernel / trace / ftrace.c

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index e6fb3e6..4fbcf56 100644 (file)
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -5985,7 +5985,8 @@ ftrace_graph_release(struct inode *inode, struct file *file)
                 * infrastructure to do the synchronization, thus we must do it
                 * ourselves.
                 */
-               synchronize_rcu_tasks_rude();
+               if (old_hash != EMPTY_HASH)
+                       synchronize_rcu_tasks_rude();
 
                free_ftrace_hash(old_hash);
        }