Commit 41c51c98 authored May 03, 2009 by Oleg Nesterov Committed by Ingo Molnar May 05, 2009

rcu: rcu_sched_grace_period(): kill the bogus flush_signals()



As a kernel thread, rcu_sched_grace_period() runs with all signals ignored.
It can never receive a signal even if it sleeps in TASK_INTERRUPTIBLE, it
needs the explicit allow_signal() to be visible for signals.

[ Impact: reduce kernel size, remove dead code ]

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <20090503211118.GA22973@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 05725f7e

kernel/rcupreempt.c

+1 −7

Original line number	Diff line number	Diff line
		@@ -1356,17 +1356,11 @@ static int rcu_sched_grace_period(void *arg)

		rcu_ctrlblk.sched_sleep = rcu_sched_sleeping;
		spin_unlock_irqrestore(&rcu_ctrlblk.schedlock, flags);
		ret = 0;
		ret = 0; /* unused */
		__wait_event_interruptible(rcu_ctrlblk.sched_wq,
		rcu_ctrlblk.sched_sleep != rcu_sched_sleeping,
		ret);

		/*
		* Signals would prevent us from sleeping, and we cannot
		* do much with them in any case. So flush them.
		*/
		if (ret)
		flush_signals(current);
		couldsleepnext = 0;

		} while (!kthread_should_stop());