From: Suresh Siddha <suresh.b.siddha@intel.com>
To: "paulmck@linux.vnet.ibm.com" <paulmck@linux.vnet.ibm.com>
Cc: Nick Piggin <npiggin@suse.de>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Oleg Nesterov <oleg@redhat.com>,
Jens Axboe <jens.axboe@oracle.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Ingo Molnar <mingo@elte.hu>,
Rusty Russell <rusty@rustcorp.com.au>,
Steven Rostedt <rostedt@goodmis.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>
Subject: Re: smp.c && barriers (Was: [PATCH 1/4] generic-smp: remove single ipi fallback for smp_call_function_many())
Date: Tue, 17 Feb 2009 18:15:31 -0800 [thread overview]
Message-ID: <1234923331.29823.2.camel@vayu> (raw)
In-Reply-To: <20090217155147.GE6761@linux.vnet.ibm.com>
On Tue, 2009-02-17 at 07:51 -0800, Paul E. McKenney wrote:
> On Tue, Feb 17, 2009 at 12:26:57PM +0100, Nick Piggin wrote:
> > + spin_lock(&q->lock);
> > + list_replace_init(&q->list, &list);
> > + spin_unlock(&q->lock);
>
> OK, I'll bite...
>
> How do we avoid deadlock in the case where a pair of CPUs send to each
> other concurrently?
Sender takes the lock with interrupts-disabled. That should prevent any
deadlock, right?
next prev parent reply other threads:[~2009-02-18 2:16 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20090216204902.GA6924@redhat.com>
[not found] ` <1234818201.30178.386.camel@laptop>
[not found] ` <20090216213205.GA9098@redhat.com>
[not found] ` <1234820704.30178.396.camel@laptop>
[not found] ` <20090216220214.GA10093@redhat.com>
[not found] ` <1234823097.30178.406.camel@laptop>
[not found] ` <20090216231946.GA12009@redhat.com>
[not found] ` <1234862974.4744.31.camel@laptop>
[not found] ` <20090217101130.GA8660@wotan.suse.de>
[not found] ` <1234866453.4744.58.camel@laptop>
2009-02-17 11:26 ` Q: smp.c && barriers (Was: [PATCH 1/4] generic-smp: remove single ipi fallback for smp_call_function_many()) Nick Piggin
2009-02-17 11:48 ` Peter Zijlstra
2009-02-17 15:51 ` Paul E. McKenney
2009-02-18 2:15 ` Suresh Siddha [this message]
2009-02-18 2:40 ` Paul E. McKenney
2009-02-17 19:28 ` Q: " Oleg Nesterov
2009-02-17 21:32 ` Paul E. McKenney
2009-02-17 21:45 ` Oleg Nesterov
2009-02-17 22:39 ` Paul E. McKenney
2009-02-18 13:52 ` Nick Piggin
2009-02-18 16:09 ` Linus Torvalds
2009-02-18 16:21 ` Ingo Molnar
2009-02-18 16:21 ` Ingo Molnar
2009-02-18 16:33 ` Linus Torvalds
2009-02-18 16:58 ` Ingo Molnar
2009-02-18 17:05 ` Ingo Molnar
2009-02-18 17:10 ` Ingo Molnar
2009-02-18 17:17 ` Linus Torvalds
2009-02-18 17:23 ` Ingo Molnar
2009-02-18 17:14 ` Linus Torvalds
2009-02-18 17:47 ` Ingo Molnar
2009-02-18 18:33 ` Suresh Siddha
2009-02-18 16:37 ` Gleb Natapov
2009-02-19 0:12 ` Nick Piggin
2009-02-19 6:47 ` Benjamin Herrenschmidt
2009-02-19 13:11 ` Nick Piggin
2009-02-19 13:11 ` Nick Piggin
2009-02-19 15:06 ` Ingo Molnar
2009-02-19 21:49 ` Benjamin Herrenschmidt
2009-02-18 2:21 ` Suresh Siddha
2009-02-18 13:59 ` Nick Piggin
2009-02-18 16:19 ` Linus Torvalds
2009-02-18 16:23 ` Ingo Molnar
2009-02-18 18:43 ` Suresh Siddha
2009-02-18 19:17 ` Ingo Molnar
2009-02-18 23:55 ` Suresh Siddha
2009-02-19 12:20 ` Ingo Molnar
2009-02-19 12:29 ` Nick Piggin
2009-02-19 12:45 ` Ingo Molnar
2009-02-19 22:00 ` Suresh Siddha
2009-02-20 10:56 ` Ingo Molnar
2009-02-20 18:56 ` Suresh Siddha
2009-02-20 18:56 ` Suresh Siddha
2009-02-20 19:40 ` Ingo Molnar
2009-02-20 23:28 ` Jack Steiner
2009-02-25 3:32 ` Nick Piggin
2009-02-25 12:47 ` Ingo Molnar
2009-02-25 18:25 ` Luck, Tony
2009-03-17 18:16 ` Suresh Siddha
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