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Message-ID: <a7c155ed-71fc-4ed9-a8c8-f98024b74651@draconx.ca>
Date: Fri, 29 Mar 2024 16:11:06 -0400
From: Nick Bowler <nbowler@...conx.ca>
To: Sam Ravnborg <sam@...nborg.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
 linux-kernel@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
 sparclinux@...r.kernel.org, Andreas Larsson <andreas@...sler.com>,
 Linux regressions mailing list <regressions@...ts.linux.dev>
Subject: Re: PROBLEM: Only one CPU active on Ultra 60 since ~4.8 (regression)

Hi Sam,

On 2024-03-29 05:44, Sam Ravnborg wrote:
> I took a look at this and may have a fix. Could you try the following
> patch. It builds - but I have not tested it.

With this patch applied on top of 6.9-rc1, both CPUs appear to come up:

  % cat /proc/cpuinfo 
  [...]
  ncpus probed	: 2
  ncpus active	: 2
  [...]
  State:
  CPU0:		online
  CPU2:		online

Thanks,
  Nick

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