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

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Message-ID: <Y0gZxOA4XBDn1tXj@hirez.programming.kicks-ass.net>
Date:   Thu, 13 Oct 2022 15:59:32 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Cody Yao-oc <CodyYao-oc@...oxin.com>
Cc:     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 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>

I suppose I'll queue it up for perf/urgent post -rc1