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SubjectRe: [PATCH] dma-mapping: remove CONFIG_DMA_REMAP
On Mon, Feb 28, 2022 at 10:32:54AM +0000, Robin Murphy wrote:
> Is it even possible to hit this case now? From a quick look, all the
> architectures defining HIGHMEM either have an explicit dependency on MMU or
> don't allow deselecting it anyway (plus I don't see how HIGHMEM && !MMU
> could work in general), so I'm pretty sure this whole chunk should go away
> now.
>
> With that (or if there *is* some subtle wacky case where PageHighmem() can
> actually return true for !MMU, a comment to remind us in future),

No, you're right - I don't think we can support highmem on !CONFIG_MMU.

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