On Thu, Mar 11, 2021 at 07:48:25AM +0000, chenjun (AM) wrote: > static int dax_writeback_one(struct xa_state *xas, struct dax_device > *dax_dev, struct address_space *mapping, void *entry) > ----dax_flush(dax_dev, page_address(pfn_to_page(pfn)), count * PAGE_SIZE); > The pfn is returned by the driver. In my case, the pfn does not have > struct page. so pfn_to_page(pfn) return a wrong address. I wasn't involved, but I think the right solution here is simply to replace page_address(pfn_to_page(pfn)) with pfn_to_virt(pfn). I don't know why Dan decided to do this in the more complicated way.
