linux-kernel - Re: [PATCH v9 3/6] riscv: mm: dma-noncoherent: nonstandard cache operations support

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Date:   Wed, 14 Jun 2023 23:00:01 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Prabhakar <prabhakar.csengg@...il.com>,
        "Conor.Dooley" <conor.dooley@...rochip.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        guoren <guoren@...nel.org>,
        Andrew Jones <ajones@...tanamicro.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Samuel Holland <samuel@...lland.org>,
        linux-riscv@...ts.infradead.org,
        Christoph Hellwig <hch@...radead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>,
        "Lad, Prabhakar" <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v9 3/6] riscv: mm: dma-noncoherent: nonstandard cache
 operations support

On Wed, Jun 14, 2023 at 02:35:44PM +0200, Arnd Bergmann wrote:
> I understand that Christoph will still not like this, but I think this
> is as good as it gets, making the standard variant the fast path,
> and using the function pointers only for the nonstandard cases.

Yes.  And I really do not want to make the non-standard cases easy.
The extension to do cache maintenance have been ratified for a while
and under discussion for much longer.  Adding random crap because
vendors suck is a bad idea, and we should not be adding this crap.