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

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Message-ID: <alpine.DEB.2.21.1906162356390.1760@nanos.tec.linutronix.de>
Date:   Mon, 17 Jun 2019 00:00:58 +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 16, 2019, at 09:05, Thomas Gleixner <tglx@...utronix.de> wrote:
> diff --git a/Documentation/x86/x86_64/fsgs.rst b/Documentation/x86/x86_64/fsgs.rst
> index 380c0b5..d5588e00 100644
> --- a/Documentation/x86/x86_64/fsgs.rst
> +++ b/Documentation/x86/x86_64/fsgs.rst
> @@ -125,7 +125,7 @@ FSGSBASE instructions enablement
>  FSGSBASE instructions compiler support
>  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>  
> -GCC version 4.6.4 and newer provide instrinsics for the FSGSBASE
> +GCC version 6 and newer provide instrinsics for the FSGSBASE
>  instructions. Clang supports them as well.
>  
>    =================== ===========================
> @@ -141,7 +141,7 @@ code and the compiler option -mfsgsbase has to be added.
>  Compiler support for FS/GS based addressing
>  -------------------------------------------
>  
> -GCC version 6 and newer provide support for FS/GS based addressing via
> +GCC version 4.6.4 and newer provide support for FS/GS based addressing via
>  Named Address Spaces. GCC implements the following address space
>  identifiers for x86:

That's close to what I pushed out earlier into tip WIP.x86/cpu

Please check against that version including the Clang part about address
spaces close to the end.

Thanks, 

	tglx