From: Ingo Molnar <mingo@elte.hu>
To: Jiri Slaby <jirislaby@gmail.com>
Cc: linux-kernel@vger.kernel.org,
Linux-pm mailing list <linux-pm@lists.linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Arjan van de Ven <arjan@linux.intel.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: broken suspend (sched related) [Was: 2.6.24-rc4-mm1]
Date: Mon, 10 Dec 2007 10:10:52 +0100 [thread overview]
Message-ID: <20071210091052.GA14487@elte.hu> (raw)
In-Reply-To: <475CFF01.2090502@gmail.com>
> > softlockup: remove get_online_cpus() which doesn't help here.
> >
> > The get_online_cpus() protection seems to be bogus in
> > kernel/softlockup.c as cpu cached in check_cpu can go offline once
> > we do a put_online_cpus().
> >
> > This can also cause deadlock during a cpu offline as follows:
i'm wondering, what's the proper CPU-hotplug safe sequence here then?
I'm picking a CPU number from cpu_online_map, and that CPU could go away
while i'm still using it, right? What's saving us here?
Ingo
next prev parent reply other threads:[~2007-12-10 9:10 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20071204211701.994dfce6.akpm@linux-foundation.org>
2007-12-07 14:34 ` broken suspend (sched related) [Was: 2.6.24-rc4-mm1] Jiri Slaby
2007-12-07 15:11 ` Ingo Molnar
[not found] ` <20071207151150.GB24254@elte.hu>
2007-12-07 17:51 ` Ingo Molnar
2007-12-08 8:10 ` Jiri Slaby
[not found] ` <475A5188.6070809@gmail.com>
2007-12-08 8:39 ` Ingo Molnar
[not found] ` <20071208083939.GD30997@elte.hu>
2007-12-08 9:23 ` Jiri Slaby
[not found] ` <475A629C.7010408@gmail.com>
2007-12-08 15:24 ` Ingo Molnar
2007-12-08 17:34 ` Jiri Slaby
2007-12-08 17:43 ` Jiri Slaby
2007-12-08 23:12 ` Jiri Slaby
[not found] ` <475B24F4.3090904@gmail.com>
2007-12-09 7:46 ` Ingo Molnar
[not found] ` <20071209074647.GE22981@elte.hu>
2007-12-09 9:09 ` Jiri Slaby
2007-12-10 8:19 ` Gautham R Shenoy
2007-12-10 8:55 ` Jiri Slaby
[not found] ` <475CFF01.2090502@gmail.com>
2007-12-10 9:10 ` Ingo Molnar [this message]
2007-12-10 10:15 ` Gautham R Shenoy
[not found] ` <20071210101500.GB12880@in.ibm.com>
2007-12-10 10:21 ` Ingo Molnar
[not found] ` <20071210102157.GB31103@elte.hu>
2007-12-10 11:08 ` Gautham R Shenoy
2007-12-10 11:28 ` Ingo Molnar
[not found] ` <20071210112832.GA20189@elte.hu>
2007-12-10 11:49 ` Gautham R Shenoy
2007-12-10 9:29 ` Ingo Molnar
[not found] ` <475AD7D0.8040905@gmail.com>
2007-12-09 8:06 ` Ingo Molnar
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