[PATCH 5/7] dma-mapping: Provide CONFIG_ARCH_DMA_DEFAULT_COHERENT

[Jiaxun Yang]

> 2023年2月21日 17:58，Christoph Hellwig <hch at 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