From: Oleg Nesterov <oleg@tv-sign.ru>
To: vatsa@in.ibm.com
Cc: "Paul E. McKenney" <paulmck@us.ibm.com>,
linux-kernel@vger.kernel.org,
Dipankar Sarma <dipankar@in.ibm.com>,
Manfred Spraul <manfred@colorfullife.com>,
Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>
Subject: [PATCH] rcu: fix hotplug-cpu ->donelist leak
Date: Tue, 10 Jan 2006 17:24:53 +0300 [thread overview]
Message-ID: <43C3C3B5.61D5641@tv-sign.ru> (raw)
In-Reply-To: 20060110095811.GA30159@in.ibm.com
Pointed out by Srivatsa Vaddagiri <vatsa@in.ibm.com>.
rcu_do_batch() stops after processing maxbatch callbacks
on ->donelist leaving rcu_tasklet in TASKLET_STATE_SCHED
state.
If CPU_DEAD event happens remaining ->donelist entries are
lost, rcu_offline_cpu() kills this tasklet.
With this patch ->donelist migrates along with ->curlist
and ->nxtlist to the current cpu.
Compile tested.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
--- 2.6.15/kernel/rcupdate.c~4_HPFIX 2006-01-10 19:06:38.000000000 +0300
+++ 2.6.15/kernel/rcupdate.c 2006-01-10 19:15:01.000000000 +0300
@@ -343,8 +343,9 @@ static void __rcu_offline_cpu(struct rcu
spin_unlock_bh(&rcp->lock);
rcu_move_batch(this_rdp, rdp->curlist, rdp->curtail);
rcu_move_batch(this_rdp, rdp->nxtlist, rdp->nxttail);
-
+ rcu_move_batch(this_rdp, rdp->donelist, rdp->donetail);
}
+
static void rcu_offline_cpu(int cpu)
{
struct rcu_data *this_rdp = &get_cpu_var(rcu_data);
next prev parent reply other threads:[~2006-01-10 13:08 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-08 19:19 [PATCH 2/5] rcu: don't check ->donelist in __rcu_pending() Oleg Nesterov
2006-01-08 22:00 ` Paul E. McKenney
2006-01-09 9:31 ` Srivatsa Vaddagiri
2006-01-09 14:51 ` Oleg Nesterov
2006-01-09 13:42 ` Srivatsa Vaddagiri
2006-01-09 15:33 ` Oleg Nesterov
2006-01-09 18:59 ` Paul E. McKenney
2006-01-09 20:31 ` Oleg Nesterov
2006-01-09 19:59 ` Paul E. McKenney
2006-01-10 9:58 ` Srivatsa Vaddagiri
2006-01-10 14:24 ` Oleg Nesterov [this message]
2006-01-11 5:01 ` [PATCH] rcu: fix hotplug-cpu ->donelist leak Paul E. McKenney
2006-01-11 16:28 ` Paul E. McKenney
2006-01-11 19:25 ` Oleg Nesterov
2006-01-11 18:21 ` Paul E. McKenney
2006-01-10 14:27 ` [PATCH 2/5] rcu: don't check ->donelist in __rcu_pending() Oleg Nesterov
2006-01-10 18:13 ` Dipankar Sarma
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