linux-kernel - RE: [RFC PATCH 1/3] Documentation/x86: Add documentation for /proc/cpuinfo feature flags

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Date:   Mon, 15 Jun 2020 18:31:50 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Borislav Petkov <bp@...en8.de>,
        "Park, Kyung Min" <kyung.min.park@...el.com>
CC:     "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "Neri, Ricardo" <ricardo.neri@...el.com>,
        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Subject: RE: [RFC PATCH 1/3] Documentation/x86: Add documentation for
 /proc/cpuinfo feature flags

> 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.

-Tony