linux-kernel - Re: [PATCH] x86: Document the hotplug code is incompatible with x86 irq handling

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Date:	Fri, 1 Jun 2007 22:44:38 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Robert Hancock <hancockr@...w.ca>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>, linux-kernel@...r.kernel.org,
	Neil Brown <neilb@...e.de>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] x86: Document the hotplug code is incompatible with x86 irq handling

[Removed the Zwane's address from the CC list, because I get rejects from it]

On Friday, 1 June 2007 22:29, Eric W. Biederman wrote:
> "Rafael J. Wysocki" <rjw@...k.pl> writes:
> 
> > Very well, but could you _please_ give us some time to do this?
> >
> > We know of the problem now and will work to fix it, but it's not _that_ easy.
> >
> > In fact, we also rely on the CPU hotplug's code that takes tasks away from the
> > offlined CPUs (and does the opposite with respect to the onlined CPUs), so
> > we just can't get rid of the CPU hotplug _right_ _now_.
> 
> Sure.  My primary point was to document this, and get things moving if
> possible to fix it.  This patch is 2.6.23 at the earliest, so there is
> some time to work on it even on the most optimistic merge schedule.
> 
> I just don't want to be complacent and let this problem sit undetected
> in back corner any more.

So, can you advise what we can do to get the "nonboot" CPUs out of the picture
during a suspend/hibernation?

Greetings,
Rafael
 

-- 
"Premature optimization is the root of all evil." - Donald Knuth
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