From: Vladimir Murzin <vladimir.murzin@arm.com>
To: Arnd Bergmann <arnd@kernel.org>, Robin Murphy <robin.murphy@arm.com>
Cc: Russell King <linux@armlinux.org.uk>,
Linus Walleij <linus.walleij@linaro.org>,
Arnd Bergmann <arnd@arndb.de>, kernel test robot <lkp@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Marc Zyngier <maz@kernel.org>, Ard Biesheuvel <ardb@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Mark Rutland <mark.rutland@arm.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>,
Anshuman Khandual <anshuman.khandual@arm.com>
Subject: Re: [PATCH 2/2] ARM: remove support for NOMMU ARMv4/v5
Date: Wed, 9 Mar 2022 16:21:39 +0000 [thread overview]
Message-ID: <08232117-7444-55d8-e13c-b49828c8f3e9@arm.com> (raw)
In-Reply-To: <CAK8P3a20ccBbAwgVkq3n6tMehFH4YEyzquTkF3V=nJ46Tk4ePg@mail.gmail.com>
On 3/9/22 4:17 PM, Arnd Bergmann wrote:
> On Wed, Mar 9, 2022 at 4:48 PM Robin Murphy <robin.murphy@arm.com> wrote:
>>
>> On 2022-03-09 14:40, Arnd Bergmann wrote:
>>> From: Arnd Bergmann <arnd@arndb.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.
>>
>> In that case, it would probably make sense to garbage-collect all the
>> configs, setup code and other stuff relating to older MMU-less CPU cores
>> like ARM1156, ARM940, etc. at the same time.
>
> Right, good idea. These are only selected by CONFIG_ARCH_INTEGRATOR,
> but that in turn doesn't build for CONFIG_MMU=n because it depends on
> ARCH_MULTIPLATFORM. I'll send a patch for these.
>
> I also went back and forth between removing the #ifdefs in
> arch/arm/mm/proc-*.S for this patch, though I did not do that in the end.
> We may still want them at least for proc-v7.S because that is a small
> chance that someone will want to support Cortex-R.
>
I'd appreciate if you keep them since I run Cortex-R52...
Cheers
Vladimir
> Arnd
>
next prev parent reply other threads:[~2022-03-09 16:32 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-09 14:40 [PATCH 1/2] ARM: fix building NOMMU ARMv4/v5 kernels Arnd Bergmann
2022-03-09 14:40 ` [PATCH 2/2] ARM: remove support for NOMMU ARMv4/v5 Arnd Bergmann
2022-03-09 15:48 ` Robin Murphy
2022-03-09 16:17 ` Arnd Bergmann
2022-03-09 16:21 ` Vladimir Murzin [this message]
2022-03-09 16:38 ` Arnd Bergmann
2022-03-10 1:29 ` Linus Walleij
2022-03-10 1:22 ` Linus Walleij
2022-03-10 9:23 ` Arnd Bergmann
2022-03-10 14:21 ` Robin Murphy
2022-03-14 23:00 ` Linus Walleij
2022-03-15 7:27 ` Arnd Bergmann
2022-03-10 1:19 ` [PATCH 1/2] ARM: fix building NOMMU ARMv4/v5 kernels Linus Walleij
2022-03-12 9:14 ` Ard Biesheuvel
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