-retry:
- sh = rcu_dereference(p->sighand);
-
- spin_lock_irqsave(&sh->siglock, flags);
- if (p->sighand != sh) {
- /* We raced with exec() in a multithreaded process... */
- spin_unlock_irqrestore(&sh->siglock, flags);
- goto retry;
- }
-
- /*
- * We do the check here again to handle the following scenario:
- *
- * CPU 0 CPU 1
- * send_sigqueue
- * check PF_EXITING
- * interrupt exit code running
- * __exit_signal
- * lock sighand->siglock
- * unlock sighand->siglock
- * lock sh->siglock
- * add(tsk->pending) flush_sigqueue(tsk->pending)
- *
- */
-
- if (unlikely(p->flags & PF_EXITING)) {
- ret = -1;
- goto out;
- }
-