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Date:   Mon, 15 Jun 2020 20:40:41 +0200
From:   "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>
To:     "Luck, Tony" <tony.luck@intel.com>
Cc:     Borislav Petkov <bp@alien8.de>,
        "Park, Kyung Min" <kyung.min.park@intel.com>,
        "x86@kernel.org" <x86@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "tglx@linutronix.de" <tglx@linutronix.de>,
        "mingo@redhat.com" <mingo@redhat.com>,
        "hpa@zytor.com" <hpa@zytor.com>,
        "ak@linux.intel.com" <ak@linux.intel.com>,
        "Hansen, Dave" <dave.hansen@intel.com>,
        "Shankar, Ravi V" <ravi.v.shankar@intel.com>,
        "Neri, Ricardo" <ricardo.neri@intel.com>,
        Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Subject: Re: [RFC PATCH 1/3] Documentation/x86: Add documentation for
 /proc/cpuinfo feature flags
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On Mon, Jun 15, 2020 at 06:31:50PM +0000, Luck, Tony wrote:
> > In general, this should say something along the lines that /proc/cpuinfo
> > shows features which the kernel supports.
> >
> > "For a full list of CPUID flags which the CPU supports, use
> > tools/arch/x86/tools/cpuid/cpuid"
> >
> > :-)
> 
> Dave Hansen had suggested (offline) that we add a cpuid tool to the kernel sources.
> 
> I think that's a lot of (duplicated) work for someone to maintain.  The version of this
> tool at http://www.etallen.com/cpuid.html is close to 10K lines of code.

10k is nothing, have you looked at tools/perf/ ?  :)

greg k-h