On Tue, 11 May 2021 at 12:05, Mike Rapoport <rppt@xxxxxxxxxx> 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. > Did you use EFI boot when testing this? The memory map is much more fragmented in that case, so this would be a good data point. > I beleive it would be best to route these via mmotm tree. > > v4: > * rebase on v5.13-rc1 > > v3: Link: https://lore.kernel.org/lkml/20210422061902.21614-1-rppt@xxxxxxxxxx > * Fix minor issues found by Anshuman > * Freshen up the declaration of pfn_valid() to make it consistent with > pfn_is_map_memory() > * Add more Acked-by and Reviewed-by tags, thanks Anshuman and David > > v2: Link: https://lore.kernel.org/lkml/20210421065108.1987-1-rppt@xxxxxxxxxx > * Add check for PFN overflow in pfn_is_map_memory() > * Add Acked-by and Reviewed-by tags, thanks David. > > v1: Link: https://lore.kernel.org/lkml/20210420090925.7457-1-rppt@xxxxxxxxxx > * Add comment about the semantics of pfn_valid() as Anshuman suggested > * Extend comments about MEMBLOCK_NOMAP, per Anshuman > * Use pfn_is_map_memory() name for the exported wrapper for > memblock_is_map_memory(). It is still local to arch/arm64 in the end > because of header dependency issues. > > rfc: Link: https://lore.kernel.org/lkml/20210407172607.8812-1-rppt@xxxxxxxxxx > > Mike Rapoport (4): > include/linux/mmzone.h: add documentation for pfn_valid() > memblock: update initialization of reserved pages > arm64: decouple check whether pfn is in linear map 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 | 3 ++- > arch/arm64/kvm/mmu.c | 2 +- > arch/arm64/mm/init.c | 14 +++++++++++++- > arch/arm64/mm/ioremap.c | 4 ++-- > arch/arm64/mm/mmu.c | 2 +- > include/linux/memblock.h | 4 +++- > include/linux/mmzone.h | 11 +++++++++++ > mm/memblock.c | 28 ++++++++++++++++++++++++++-- > 10 files changed, 60 insertions(+), 13 deletions(-) > > > base-commit: 6efb943b8616ec53a5e444193dccf1af9ad627b5 > -- > 2.28.0 >
