linux-kernel - Re: [PATCH 7/8] membarrier: Remove arm (32) support for SYNC

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Message-ID: <CACRpkdYHoC66K7W6mUMqKfAJkcKeopBnAq8Rq+tLSdLo61jtAQ@mail.gmail.com>
Date:   Fri, 18 Jun 2021 14:54:05 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Krzysztof Halasa <khalasa@...p.pl>,
        Neil Armstrong <narmstrong@...libre.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Will Deacon <will@...nel.org>
Subject: Re: [PATCH 7/8] membarrier: Remove arm (32) support for SYNC_CORE

On Wed, Jun 16, 2021 at 6:27 PM Russell King (Oracle)
<linux@...linux.org.uk> wrote:

> Arnd tells me that the current remaining ARM11MPCore users are:
> - CNS3xxx (where there is some martinal interest in the Gateworks
>   Laguna platform)
> - Similar for OXNAS
> - There used to be the Realview MPCore tile - I haven't turned that on
>   in ages, and it may be that the 3V cell that backs up the encryption
>   keys is dead so it may not even boot.

I have this machine with 4 x ARM11 MPCore, it works like a charm.
I use it to test exactly this kind of stuff, I know if a kernel works
on ARM11MPCore it works on anything because of how fragile
it is.

> So it seems to come down to a question about CNS3xxx and OXNAS. If
> these aren't being used, maybe we can drop ARM11MPCore support and
> the associated platforms?
>
> Linus, Krzysztof, Neil, any input?

I don't especially need to keep the ARM11MPCore machine alive,
it is just a testchip after all. The Oxnas is another story, that has wide
deployment and was contributed recently (2016) and has excellent
support in OpenWrt so I wouldn't really want
to axe that.

Yours,
Linus Walleij