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SubjectRe: [PATCH 0/7] MIPS DMA coherence fixes
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> 2023年2月21日 19:46,Robin Murphy <robin.murphy@arm.com> 写道:
>
> On 2023-02-21 18:15, Jiaxun Yang wrote:
>>> 2023年2月21日 17:54,Christoph Hellwig <hch@lst.de> 写道:
>>>
>>> Can you explain the motivation here? Also why riscv patches are at
>>> the end of a mips fіxes series?
>> Ah sorry for any confusion.
>> So the main purpose of this patch is to fix MIPS’s broken per-device coherency.
>> To be more precise, we want to be able to control the default coherency for all devices probed from
>> devicetree in early boot code.
>
> Including the patch which actually does that would be helpful. As it is, patches 4-7 here just appear to be moving an option around for no practical effect.

Well the affect is default coherency of devicetree probed devices are now following dma_default_coherent
instead of a static Kconfig option. For MIPS platform, dma_default_coherent will be determined by boot code.

Thanks
- Jiaxun

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