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Date: Tue, 5 May 2009 18:35:07 GMT
From: tip-bot for Oleg Nesterov <oleg@...hat.com>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
hpa@...or.com, mingo@...hat.com, akpm@...ux-foundation.org,
oleg@...hat.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:core/rcu] rcu: rcu_sched_grace_period(): kill the bogus flush_signals()
Commit-ID: 41c51c98f588edcdf6141cff1895df738e03ddd4
Gitweb: http://git.kernel.org/tip/41c51c98f588edcdf6141cff1895df738e03ddd4
Author: Oleg Nesterov <oleg@...hat.com>
AuthorDate: Sun, 3 May 2009 23:11:18 +0200
Committer: Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 5 May 2009 20:28:05 +0200
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@...hat.com>
Reviewed-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
LKML-Reference: <20090503211118.GA22973@...hat.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
kernel/rcupreempt.c | 8 +-------
1 files changed, 1 insertions(+), 7 deletions(-)
diff --git a/kernel/rcupreempt.c b/kernel/rcupreempt.c
index ce97a4d..beb0e65 100644
--- a/kernel/rcupreempt.c
+++ b/kernel/rcupreempt.c
@@ -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());
--
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