linux-kernel - Re: [PATCH] ARM: do not assemble iwmmxt.S with LLVM toolchain

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Message-ID: <20200413210049.GQ25745@shell.armlinux.org.uk>
Date:   Mon, 13 Apr 2020 22:00:49 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Peter Smith <Peter.Smith@....com>,
        Stefan Agner <stefan@...er.ch>,
        David Howells <dhowells@...hat.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Manoj Gupta <manojgupta@...gle.com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Jian Cai <caij2003@...il.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Ilie Halip <ilie.halip@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Jian Cai <jiancai@...gle.com>,
        Doug Anderson <armlinux@...isordat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Patrick Bellasi <patrick.bellasi@....com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Tejun Heo <tj@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] ARM: do not assemble iwmmxt.S with LLVM toolchain

On Mon, Apr 13, 2020 at 12:23:38PM -0700, Nick Desaulniers wrote:
> On Fri, Apr 10, 2020 at 5:33 AM Russell King - ARM Linux admin
> <linux@...linux.org.uk> wrote:
> >
> > For older CPUs, it doesn't matter what the latest ARM ARM says, the
> > appropriate version of the ARM ARM is the one relevant for the CPU
> > architecture.  This is a mistake frequently made, and it's been pointed
> > out by Arm Ltd in the past (before ARMv6 even came on the scene) that
> > keeping older revisions is necessary if you want to be interested in
> > the older architectures.
> 
> As if it never existed *waves hands*.  Interesting.  Does ARM still
> distribute these older reference manuals? Do you keep copies of the
> older revisions?

I keep copies of every document I've needed that I'm allowed to keep
as a general rule, including the early paper copies of the ARM
architecture reference manual. I even have the original VLSI ARM2
databook.

For the ARMv5TE architecture, you're looking for DDI0100E which can be
found via google.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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