linux-kernel - [PATCH v4 0/4] arm64: drop pfn_valid_within() and simplify pfn

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Date:   Tue, 11 May 2021 13:05:46 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        David Hildenbrand <david@...hat.com>,
        Marc Zyngier <maz@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mike Rapoport <rppt@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Will Deacon <will@...nel.org>, kvmarm@...ts.cs.columbia.edu,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: [PATCH v4 0/4] arm64: drop pfn_valid_within() and simplify pfn_valid()

From: Mike Rapoport <rppt@...ux.ibm.com>

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.

v4:
* rebase on v5.13-rc1

v3: Link: https://lore.kernel.org/lkml/20210422061902.21614-1-rppt@kernel.org
* 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@kernel.org
* 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@kernel.org
* 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@kernel.org

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