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

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Message-ID: <20070731012340.GD3673@sequoia.sous-sol.org>
Date:	Mon, 30 Jul 2007 18:23:40 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"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 Thu, 26 Jul 2007, Rafael J. Wysocki wrote:
> > On my Turion64-based HPC nx6325 with the 2.6.23-rc1 x86_64 kernel doing
> > 
> > # echo 0 > /sys/devices/system/cpu/cpu1/online
> > 
> > causes the system to crash in a spectacular fashion (call traces going
> > continuously on the console, no reaction to anything except for the power
> > button).  For this reason, suspend and hibernation don't work as well.
> 
> Yeah, I really shouldn't have applied that patch. I didn't notice that it 
> not only cleaned up the direct memcpy's, it also re-introduced the damn 
> broken code that we fixed once already.

This also fixes paravirt patching which was broken when text_poke()
tried to patch the various pv ops in lookup_address.

thanks,
-chris
-
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