On 2021/5/11 18:05, Mike Rapoport wrote:
From: Mike Rapoport <rppt@xxxxxxxxxxxxx> Hi, These patches aim to remove CONFIG_HOLES_IN_ZONE and essentially hardwire pfn_valid_within() to 1. The idea is to mark NOMAP pages as reserved in the memory map and restore the intended semantics of pfn_valid() to designate availability of struct page for a pfn. With this the core mm will be able to cope with the fact that it cannot use NOMAP pages and the holes created by NOMAP ranges within MAX_ORDER blocks will be treated correctly even without the need for pfn_valid_within. The patches are boot tested on qemu-system-aarch64. I beleive it would be best to route these via mmotm tree.
Reviewed-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
