Messages in this thread | | | Date | Sat, 18 Sep 2021 07:18:43 +0200 | From | Christoph Hellwig <> | Subject | Re: [BUG 5.14] arm64/mm: dma memory mapping fails (in some cases) |
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On Sat, Sep 18, 2021 at 12:22:47AM +0300, Mike Rapoport wrote: > I did some digging and it seems that the most "generic" way to check if a > page is in RAM is page_is_ram(). It's not 100% bullet proof as it'll give > false negatives for architectures that do not register "System RAM", but > those are not using dma_map_resource() anyway and, apparently, never would.
The downside of page_is_ram is that it looks really expensiv for something done at dma mapping time.
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