linux-kernel - Re: Candidate Linux ABI for Intel AMX and hypothetical new related features

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Message-ID: <CAJvTdK=QbPRtZ9zPgu8c9tqxOtaG3apo7u4BBTXP0--qVWA5ig@mail.gmail.com>
Date:   Mon, 29 Mar 2021 11:47:42 -0400
From:   Len Brown <lenb@...nel.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Andy Lutomirski <luto@...nel.org>,
        "Bae, Chang Seok" <chang.seok.bae@...el.com>,
        Dave Hansen <dave.hansen@...el.com>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        libc-alpha <libc-alpha@...rceware.org>,
        Florian Weimer <fweimer@...hat.com>,
        Rich Felker <dalias@...c.org>, Kyle Huey <me@...ehuey.com>,
        Keno Fischer <keno@...iacomputing.com>,
        Linux API <linux-api@...r.kernel.org>
Subject: Re: Candidate Linux ABI for Intel AMX and hypothetical new related features

On Sat, Mar 27, 2021 at 5:58 AM Greg KH <gregkh@...uxfoundation.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