linux-kernel - [PATCH] do_sigaction: remove now unneeded recalc

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Message-ID: <20070802223720.GA623@tv-sign.ru>
Date:	Fri, 3 Aug 2007 02:37:20 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] do_sigaction: remove now unneeded recalc_sigpending()

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@...sign.ru>

--- t/kernel/signal.c~	2007-08-03 02:26:30.000000000 +0400
+++ t/kernel/signal.c	2007-08-03 02:28:50.000000000 +0400
@@ -2342,7 +2342,6 @@ 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);
 		}

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