Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
References: <CALCETrW2QHa2TLvnUuVxAAheqcbSZ-5_WRXtDSAGcbG8N+gtdQ@mail.gmail.com>
 <CALCETrUBC34NSHj3eLScYtHJk_7ZHOVJZVPkdLUXemPEiyA_uA@mail.gmail.com>
 <CAJvTdKm8aQPwQMXFQWgVb5dfJ88ds3d0=uHOyWeueUqfya9Nsw@mail.gmail.com> <YF8B3M9qihZzCf3n@kroah.com>
In-Reply-To: <YF8B3M9qihZzCf3n@kroah.com>
From:   Len Brown <lenb@kernel.org>
Date:   Mon, 29 Mar 2021 11:47:42 -0400
Message-ID: <CAJvTdK=QbPRtZ9zPgu8c9tqxOtaG3apo7u4BBTXP0--qVWA5ig@mail.gmail.com>
Subject: Re: Candidate Linux ABI for Intel AMX and hypothetical new related features
To:     Greg KH <gregkh@linuxfoundation.org>
Cc:     Andy Lutomirski <luto@kernel.org>,
        "Bae, Chang Seok" <chang.seok.bae@intel.com>,
        Dave Hansen <dave.hansen@intel.com>, X86 ML <x86@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        libc-alpha <libc-alpha@sourceware.org>,
        Florian Weimer <fweimer@redhat.com>,
        Rich Felker <dalias@libc.org>, Kyle Huey <me@kylehuey.com>,
        Keno Fischer <keno@juliacomputing.com>,
        Linux API <linux-api@vger.kernel.org>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Sat, Mar 27, 2021 at 5:58 AM Greg KH <gregkh@linuxfoundation.org> wrote:
>
> On Fri, Mar 26, 2021 at 11:39:18PM -0400, Len Brown wrote:
> > Hi Andy,
> >
> > Say a mainline links with a math library that uses AMX without the
> > knowledge of the mainline.

sorry for the confusion.

mainline = main().

ie. the part of the program written by you, and not the library you linked with.

In particular, the library may use instructions that main() doesn't know exist.

-- 
Len Brown, Intel Open Source Technology Center