linux-kernel - Re: [PATCH v7 18/18] x86/fsgsbase/64: Add documentation for FSGSBASE

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Message-ID: <alpine.DEB.2.21.1906161038160.1760@nanos.tec.linutronix.de>
Date:   Sun, 16 Jun 2019 10:39:28 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Bae, Chang Seok" <chang.seok.bae@...el.com>
cc:     Andy Lutomirski <luto@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>, Andi Kleen <ak@...ux.intel.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "x86@...nel.org" <x86@...nel.org>, Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH v7 18/18] x86/fsgsbase/64: Add documentation for
 FSGSBASE

On Sun, 16 Jun 2019, Bae, Chang Seok wrote:
> On Jun 14, 2019, at 13:07, Bae, Chang Seok <chang.seok.bae@...el.com<mailto:chang.seok.bae@...el.com>> wrote:
> 
> 
> On Jun 13, 2019, at 23:54, Thomas Gleixner <tglx@...utronix.de<mailto:tglx@...utronix.de>> wrote:
> 
> +The GS segment has no common use and can be used freely by
> +applications. There is no storage class specifier similar to __thread which
> +would cause the compiler to use GS based addressing modes. Newer versions
> +of GCC and Clang support GS based addressing via address space identifiers.
> +
> 
> …
> 
> +
> +Clang does not provide these address space identifiers, but it provides
> +an attribute based mechanism:
> +
> 
> These two sentences seem to conflict with each other; Clang needs to be clarified
> above.
> 
> Thanks for the write-up. Just preparing v8 right now. Will send out shortly.

Please dont. Send me a delta patch against the documentation. I have queued
all the other patches already internally. I did not push it out because I
wanted to have proper docs.

Thanks,

	tglx