linux-kernel - Re: [PATCH] ARM: ep93xx: remove MaverickCrunch support

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Date:   Tue, 3 Aug 2021 11:52:09 -0400 (EDT)
From:   Jerome Oufella <jerome.oufella@...oirfairelinux.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     martinwguy <martinwguy@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Hartley Sweeten <hsweeten@...ionengravers.com>,
        Alexander Sverdlin <alexander.sverdlin@...il.com>,
        SoC Team <soc@...nel.org>,
        Nikita Shubin <nikita.shubin@...uefel.me>,
        Arnd Bergmann <arnd@...db.de>, Oleg Nesterov <oleg@...hat.com>,
        Hubert Feurstein <hubert.feurstein@...tec.at>,
        Lukasz Majewski <lukma@...x.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] ARM: ep93xx: remove MaverickCrunch support

On Aug 3, 2021, at 7:58 AM, Arnd Bergmann arnd@...nel.org wrote:

> On Tue, Aug 3, 2021 at 1:41 PM Martin Guy <martinwguy@...il.com> wrote:
>>
>> I forward opinion from people currently producing and supporting EP93XX boards:
> 
> Thanks a lot for bringing them in. I definitely don't want to remove support for
> something that is actively being used, and we don't have to merge the patch
> if they currently rely on MaverickCrunch on older platforms.
> 
> It does sound however like Jerome's customers are using a normal (softfloat)
> Linus distro on EP93xx, rather than one using the original MaverickCrunch
> FPU instructions. There are no plans to discontinue EP93xx support, there
> is actually a good amount of recent work going into updating the platform.
> 
> Jerome, please let me know if I understood you correctly here. If your
> customers do rely on MaverickCrunch support in user space, I would
> leave that in the kernel for as long as ep93xx itself is supported, and instead
> require building support with the GNU assembler to avoid having to
> add support to the clang integrated assembler. If you don't know of anyone
> using MaverickCrunch, I would go ahead with my patch to remove kernel
> support.
> 
>      Arnd

Arnd,

You are correct on assuming usage of softfloat toolchains and not
using the MaverickCrunch unit. AFAIK, I am not aware of active users
of this FPU on recent setups.

 Jerome