linux-kernel - Re: [PATCH 1/2] ARM: remove support for NOMMU ARMv4/v5

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Date:   Thu, 17 Mar 2022 08:38:40 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Russell King <linux@...linux.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Vladimir Murzin <vladimir.murzin@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Mark Rutland <mark.rutland@....com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        John Crispin <john@...ozen.org>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Marc Zyngier <maz@...nel.org>, Jean Delvare <jdelvare@...e.de>,
        Stephen Boyd <sboyd@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH 1/2] ARM: remove support for NOMMU ARMv4/v5

Hi Arnd,

On Wed, Mar 16, 2022 at 10:13 PM Arnd Bergmann <arnd@...nel.org> wrote:
> From: Arnd Bergmann <arnd@...db.de>
>
> It is possible to build MMU-less kernels for Cortex-M base
> microcrontrollers as well as a couple of older platforms that
> have not been converted to CONFIG_ARCH_MULTIPLATFORM,
> specifically ep93xx, footbridge, dove, sa1100 and s3c24xx.
>
> It seems unlikely that anybody has tested those configurations
> in recent years, as even building them is frequently broken.
> A patch I submitted caused another build time regression
> in this configuration. I sent a patch for that, but it seems
> better to also remove the option entirely, leaving ARMv7-M
> as the only supported Arm NOMMU target for simplicity.
>
> A couple of platforms have dependencies on CONFIG_MMU, those
> can all be removed now. Notably, mach-integrator tries to
> support MMU-less CPU cores, but those have not actually been
> selectable for a long time.
>
> This addresses several build failures in randconfig builds that
> have accumulated over the years.
>
> Cc: Vladimir Murzin <vladimir.murzin@....com>
> Cc: Russell King <linux@...linux.org.uk>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks for your patch!

Always feeling sad when seeing a feature is removed...

>  arch/arm/mach-shmobile/Kconfig                |  2 +-

Acked-by: Geert Uytterhoeven <geert+renesas@...der.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds