linux-kernel - Re: [PATCH] x86/perf: Fixed kernel panic during boot on Nano processor.

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Date:   Sun, 16 Oct 2022 11:59:49 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Arjan <8vvbbqzo567a@...pam.xutrox.com>
Cc:     Cody Yao-oc <CodyYao-oc@...oxin.com>, mingo@...hat.com,
        acme@...nel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, tglx@...utronix.de, bp@...en8.de,
        hpa@...or.com, x86@...nel.org, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, shyaololo@....com
Subject: Re: [PATCH] x86/perf: Fixed kernel panic during boot on Nano
 processor.

On Sun, Oct 16, 2022 at 11:53:14AM +0200, Arjan wrote:
> On 13-10-2022 17:07, Peter Zijlstra wrote:
> > On Mon, Jun 07, 2021 at 09:31:09AM +0800, Cody Yao-oc wrote:
> > > From: CodyYao-oc <CodyYao-oc@...oxin.com>
> > > 
> > > Nano processor may not fully support rdpmc instruction, it works well
> > > for reading general pmc counter, but will lead to GP(general protection)
> > > when accessing fixed pmc counter. Futhermore, family/model information
> > > is same between Nano processor and ZX-C processor, it leads to zhaoxin
> > > pmu driver is wrongly loaded for Nano processor, which resulting boot
> > > kernal fail.
> > > 
> > > To solve this problem, stepping information will be checked to distinguish
> > > between Nano processor and ZX-C processor.
> > > 
> > > [https://bugzilla.kernel.org/show_bug.cgi?id=212389]
> > > 
> > > Reported-by: Arjan <8vvbbqzo567a@...pam.xutrox.com>
> > > Signed-off-by: CodyYao-oc <CodyYao-oc@...oxin.com>
> > 
> > *sigh*.. so this email address doesn't exist, as such I can't apply this
> > patch. Consider it dropped.
> 
> If it's about my email address: The address exists and works.
> If the nospam part bothers you, that part can be left out. You may leave the reported-by line out if you want to.

The SoB address (CodyYao-oc@...oxin.com) bounced for me -- since that's
the patch author that is somewhat important.