From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: Nick Piggin <piggin@cyberone.com.au>,
Nathan Lynch <nathanl@austin.ibm.com>,
lkml - Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>, Ingo Molnar <mingo@elte.hu>
Subject: Re: [patch 2/2] cpu hotplug notifier for updating sched domains
Date: Thu, 09 Sep 2004 20:31:57 +1000 [thread overview]
Message-ID: <4140311D.4080405@yahoo.com.au> (raw)
In-Reply-To: <1094725124.25639.18.camel@bach>
Rusty Russell wrote:
> On Wed, 2004-09-08 at 12:19, Nick Piggin wrote:
>>Do you have a theoretical race here? Can we hotplug a CPU before the notifier
>>is registered? (I know we *can't* because it is still earlyish boot).
>
>
> No, init has so many serial assumptions that this is the least of our
> worries.
>
No. But the point is, you cannot (easily) set something up like this:
"do some setup with this specific, valid cpu_online_map";
"register notifier so we can keep everything valid";
without a race between them. Protecting the notifier chain under a
different lock is the trivial fix. I'll send the patch if you'd
like?
prev parent reply other threads:[~2004-09-09 10:48 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-07 18:50 [patch 2/2] cpu hotplug notifier for updating sched domains nathanl
2004-09-08 0:44 ` Nick Piggin
2004-09-08 2:05 ` Nathan Lynch
2004-09-08 2:19 ` Nick Piggin
2004-09-08 2:55 ` Nathan Lynch
2004-09-09 10:18 ` Rusty Russell
2004-09-09 10:31 ` Nick Piggin [this message]
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