linux-kernel - Re: PROBLEM: Only one CPU active on Ultra 60 since ~4.8 (regression)

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Message-ID: <20240330091601.GA128565@ravnborg.org>
Date: Sat, 30 Mar 2024 10:16:01 +0100
From: Sam Ravnborg <sam@...nborg.org>
To: Nick Bowler <nbowler@...conx.ca>
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)

On Fri, Mar 29, 2024 at 04:11:06PM -0400, Nick Bowler wrote:
> 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, I will add a Tested-by: Nick Bowler <nbowler@...conx.ca>
and submit the patch properly along with a few other sparc64 related
fixes.

	Sam