[PATCH] dma-mapping: clear mark DMA ops as an architecture feature

[Robin Murphy]

On 24/08/2024 4:57 am, Christoph Hellwig wrote:
> DMA ops are a helper for architectures and not for drivers to override
> the DMA implementation.  Unfortunately driver authors keep ignoring
> this.  Make this more clear by renaming the symbol to ARCH_DMA_OPS,
> have the three drivers overriding it depend on that.  They should
> probably also be marked broken, but we can give them a bit of a grace
> period for that.

Nit: from a quick survey of "git grep 'select ARCH_'", maybe 
ARCH_HAS_DMA_OPS might be the clearest and most consistent name? 
Otherwise, now that any potential confusion from drivers/iommu is no 
more, I too thoroughly approve of the overall idea.

Acked-by: Robin Murphy <robin.murphy at arm.com>