1 files changed, 7 insertions, 0 deletions

diff --git a/kernel/signal.c b/kernel/signal.c
index 29a410780aa9..ae60996fedff 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2491,6 +2491,13 @@ void __set_current_blocked(const sigset_t *newset)
 {
         struct task_struct *tsk = current;
 
+        /*
+         * In case the signal mask hasn't changed, there is nothing we need
+         * to do. The current->blocked shouldn't be modified by other task.
+         */
+        if (sigequalsets(&tsk->blocked, newset))
+                return;
+
         spin_lock_irq(&tsk->sighand->siglock);
         __set_task_blocked(tsk, newset);
         spin_unlock_irq(&tsk->sighand->siglock);