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 only boot tested on qemu-system-aarch64 so I'd really appreciate memory stress tests on real hardware. If this actually works we'll be one step closer to drop custom pfn_valid() on arm64 altogether. Mike Rapoport (3): memblock: update initialization of reserved pages arm64: decouple check whether pfn is normal memory from pfn_valid() arm64: drop pfn_valid_within() and simplify pfn_valid() arch/arm64/Kconfig | 3 --- arch/arm64/include/asm/memory.h | 2 +- arch/arm64/include/asm/page.h | 1 + arch/arm64/kvm/mmu.c | 2 +- arch/arm64/mm/init.c | 10 ++++++++-- arch/arm64/mm/ioremap.c | 4 ++-- arch/arm64/mm/mmu.c | 2 +- mm/memblock.c | 23 +++++++++++++++++++++-- 8 files changed, 35 insertions(+), 12 deletions(-) base-commit: e49d033bddf5b565044e2abe4241353959bc9120 -- 2.28.0
