linux-kernel - Re: [PATCH v2 6/6] nvme-apple: Add initial Apple SoC NVMe driver

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Date:   Wed, 20 Apr 2022 06:34:37 +0200
From:   "hch@....de" <hch@....de>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Sven Peter <sven@...npeter.dev>, "hch@....de" <hch@....de>,
        Keith Busch <kbusch@...nel.org>, "axboe@...com" <axboe@...com>,
        "sagi@...mberg.me" <sagi@...mberg.me>,
        Hector Martin <marcan@...can.st>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-nvme@...ts.infradead.org, linux-spdx@...r.kernel.org
Subject: Re: [PATCH v2 6/6] nvme-apple: Add initial Apple SoC NVMe driver

On Tue, Apr 19, 2022 at 11:52:15AM +0200, Arnd Bergmann wrote:
> > I just checked again and 64-bit accesses seem to work fine.
> > I'll remove the lo_hi_* calls and this include.
> 
> If you remove the #include, it is no longer possible to compile-test
> this on all 32-bit architectures, though that is probably fine as long
> as the Kconfig file has the right dependencies, like
> 
>       depends on ARCH_APPLE || (COMPILE_TEST && 64BIT)
> 
> I'd prefer to keep the #include here, but I don't mind the dependency
> if Christoph prefers it that way.

So thre's really two steps here:

 1) stop uing lo_hi_readq diretly which forces 32-bit access even on
    64-bit platforms
 2) stop using the io-64-nonatomic headers entirely

I definitively want 1) done if the hardware does not require it.  Trying
to cater to 32-bit build tests on hardware that has no chance of ever
being used there by including the header seems a bit silly, but if
it makes folks happy I can live with it.

> 
>        Arnd
---end quoted text---