linux-kernel - Re: [2.6.23-rc1 REGRESSION] CPU hotplug totally broken on HPC nx6325 (x86

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Message-ID: <20070731021622.GE3673@sequoia.sous-sol.org>
Date:	Mon, 30 Jul 2007 19:16:22 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Chris Wright <chrisw@...s-sol.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Andi Kleen <ak@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Machek <pavel@....cz>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Subject: Re: [2.6.23-rc1 REGRESSION] CPU hotplug totally broken on HPC
	nx6325 (x86_64)

* Linus Torvalds (torvalds@...ux-foundation.org) wrote:
> On Mon, 30 Jul 2007, Chris Wright wrote:
> > This also fixes paravirt patching which was broken when text_poke()
> > tried to patch the various pv ops in lookup_address.
> 
> Hmm. What is "this"? The revert? 

Yes, sorry, your revert also fixes paravirt patching.

> That said, I do wonder whether virtualization still has problems with 
> CONFIG_RODATA, though. We limit the RODATA memory ranges based on KPROBES 
> and HOTPLUG_CPU, but not based on VIRTUALIZATION.
> 
> I'd expect any virtualization fixups to hit the same problems that the SMP 
> alternatives hit. No?

Hmm, patching should've already happened, and aside of module loading,
isn't typically done again.  I think it's OK as it is.

thanks,
-chris
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