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

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Message-ID: <7f38dca513424e8ca1d99074ad6c4621@AcuMS.aculab.com>
Date:   Mon, 12 Apr 2021 07:59:49 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Len Brown' <lenb@...nel.org>, Andy Lutomirski <luto@...nel.org>
CC:     Dave Hansen <dave.hansen@...el.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        "Bae, Chang Seok" <chang.seok.bae@...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

From: Len Brown
> Sent: 11 April 2021 20:07
...
> Granted, if you have an application that is statically linked and run
> on new hardware
> and new OS, it can still fail.

That also includes anything compiled and released as a program
binary that must run on older Linux installations.

Such programs have to be compiled with old copies of the system
headers (and probably with an of gcc).

While such programs themselves won't use AVX without checking
for OS support, the glibc code on the installed system might.

Such programs can be modified to run-time detect the required
signal stack size - but cannot rely on glibc to convert
SIGSTKSZ into a function call.

	David

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