>Can we do this a different way? If we can add a predicate macro
Sure ;).
>PAGE_VALID_FOR_IO(struct page *page, dev_t dev), then we can use that
>instead.
Ok, agreed. I thought to something similar too because device drivers that
works only in DMA could work just do I/O over bigmem pages fine, without
need of any driver change even now. So we can _just_ elaborate something
more than the simple PageBIGMEM().
Andrea
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