From: Oleg Nesterov <oleg@tv-sign.ru>

With the recent changes, do_sigaction()->recalc_sigpending_and_wake() can
never clear TIF_SIGPENDING. Instead, it can set this flag and wake up the
thread without any reason. Harmless, but unneeded and wastes CPU.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Roland McGrath <roland@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/signal.c |    1 -
 1 file changed, 1 deletion(-)

diff -puN kernel/signal.c~do_sigaction-remove-now-unneeded-recalc_sigpending kernel/signal.c
--- a/kernel/signal.c~do_sigaction-remove-now-unneeded-recalc_sigpending
+++ a/kernel/signal.c
@@ -2327,7 +2327,6 @@ int do_sigaction(int sig, struct k_sigac
 			rm_from_queue_full(&mask, &t->signal->shared_pending);
 			do {
 				rm_from_queue_full(&mask, &t->pending);
-				recalc_sigpending_and_wake(t);
 				t = next_thread(t);
 			} while (t != current);
 		}
_