linux-kernel - Re: [PATCH 5/7] dma-mapping: Provide CONFIG_ARCH_DMA_DEFAULT

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Message-Id: <9AD04590-81B1-4420-979E-ACC1C7C6C8E8@flygoat.com>
Date:   Tue, 21 Feb 2023 18:18:58 +0000
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        mpe@...erman.id.au, paul.walmsley@...ive.com, palmer@...belt.com,
        Rob Herring <robh+dt@...nel.org>, m.szyprowski@...sung.com,
        robin.murphy@....com
Subject: Re: [PATCH 5/7] dma-mapping: Provide CONFIG_ARCH_DMA_DEFAULT_COHERENT



> 2023年2月21日 17:58，Christoph Hellwig <hch@....de> 写道：
> 
> On Tue, Feb 21, 2023 at 12:46:11PM +0000, Jiaxun Yang wrote:
>> Provide a kconfig option to allow arches to manipulate default
>> value of dma_default_coherent in Kconfig.
> 
> I don't see the win over just doing this by setting dma_default_coherent
> in the early boot code.

I just don’t want to dig into every archs’ early boot code to decide a good
timing for setting this variable.

Also as we do have a OF_DMA_DEFAULT_COHERENT before it makes more
sense to me.

Thanks
- Jiaxun