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    SubjectRe: [PATCH 5/7] dma-mapping: Provide CONFIG_ARCH_DMA_DEFAULT_COHERENT
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    > 2023年2月21日 17:58,Christoph Hellwig <hch@lst.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
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