linux-kernel - Re: [PATCHv2 1/1] perf/x86/intel: make error messages less confusing

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Message-ID: <20180905085212.GS24124@hirez.programming.kicks-ass.net>
Date:   Wed, 5 Sep 2018 10:52:12 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Eduardo Valentin <eduval@...zon.com>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Kan Liang <kan.liang@...ux.intel.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Jia Zhang <qianyue.zj@...baba-inc.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 1/1] perf/x86/intel: make error messages less confusing

On Thu, Aug 23, 2018 at 08:07:32AM -0700, Eduardo Valentin wrote:
> On a system with X86_FEATURE_ARCH_PERFMON disabled
> and with a model not known by family PMU drivers,
> user gets a kernel message log like the following:
> [ 0.100114] Performance Events: unsupported p6 CPU model 85 no PMU driver, software events only.
> 
> The "unsupported .. CPU" part may be confusing for some
> users leading to wrong understanding that the kernel
> does not support the CPU model.

Send them back to first grade, such that they might learn to read?