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

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Date:	Fri, 22 Jun 2007 11:27:20 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Pavel Machek <pavel@....cz>,
	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>,
	asit.k.mallick@...el.com
Subject: Re: [PATCH] x86: Document the hotplug code is incompatible with x86 irq handling

"Rafael J. Wysocki" <rjw@...k.pl> writes:
>
> OK, thanks.
>
> Eric, would you agree to follow this plan without making the entire CPU hotplug
> (on x86) depend on BROKEN?

Sorry for the delay, I missed this email.  If we can actually move irq
migration into process context on x86.  I would be happy to.

Currently I am dubious if this can be done reliably.  But I think
the benefits of doing irq migration outside of the irq handler
are sufficient to give another go at making it work.

However this isn't just Intel's ioapics we have to worry about,
but Intel's were the worst so that is a reasonable starting point.

Eric
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