linux-kernel - Re: [PATCH] dma-mapping: no need to pass a bus_type into get_arch_dma

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Message-Id: <4e57a5aa-fd7a-4cda-90e3-6a02cfeb04c0@app.fastmail.com>
Date:   Tue, 14 Feb 2023 15:12:29 +0100
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     "Richard Henderson" <richard.henderson@...aro.org>,
        "Ivan Kokshaysky" <ink@...assic.park.msu.ru>,
        "Matt Turner" <mattst88@...il.com>,
        "Thomas Bogendoerfer" <tsbogend@...ha.franken.de>,
        "James E . J . Bottomley" <James.Bottomley@...senPartnership.com>,
        "Helge Deller" <deller@....de>,
        "David S . Miller" <davem@...emloft.net>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>,
        "Dave Hansen" <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, "Christoph Hellwig" <hch@....de>,
        "Marek Szyprowski" <m.szyprowski@...sung.com>,
        "Robin Murphy" <robin.murphy@....com>,
        "Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>,
        linux-alpha@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        sparclinux@...r.kernel.org, iommu@...ts.linux.dev,
        Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH] dma-mapping: no need to pass a bus_type into get_arch_dma_ops()

On Tue, Feb 14, 2023, at 15:01, Greg Kroah-Hartman wrote:
> The get_arch_dma_ops() arch-specific function never does anything with
> the struct bus_type that is passed into it, so remove it entirely as it
> is not needed.
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
> Note: Unless someone objects, I would like to take this through the
> driver-core tree, as further bus_type cleanups depend on it, and it's
> stand-alone from everyone else's tree at the moment from what I can
> determine.

Nice find!

Reviewed-by: Arnd Bergmann <arnd@...db.de>

It looks like the bus was last required in 2020 before commit
255a69a94b8c ("sparc32: use per-device dma_ops").

    Arnd