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

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Date:   Fri, 18 Jun 2021 15:36:49 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        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>,
        Daniel Golle <daniel@...rotopia.org>
Subject: Re: [PATCH 7/8] membarrier: Remove arm (32) support for SYNC_CORE

On Fri, Jun 18, 2021 at 2:54 PM Linus Walleij <linus.walleij@...aro.org> wrote:
> On Wed, Jun 16, 2021 at 6:27 PM Russell King (Oracle) <linux@...linux.org.uk> wrote:

> > 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.

Agreed, as long as oxnas and/or cns3xxx are around, we should just keep
the realview 11mpcore support, but if both of the commercial platforms
are gone, then the realview can be retired as far as I'm concerned.

Regarding oxnas, I see that OpenWRT has a number of essential
device drivers (sata, pcie, usb and reset) that look like they could just
be merged upstream, but that effort appears to have stalled: no
device support was added to the dts files since the original 2016
merge. While the support in OpenWRT may be excellent, the platform
support in the mainline kernel is limited to ethernet, nand, uart
and gpio.

       Arnd