在 2021/3/11 20:20, Matthew Wilcox 写道: > 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. > Thanks Mattherw I think pfn_to_virt could not work in my case. Because of the pfn is not in memory block. -- Regards Chen Jun
