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From: Mike Rapoport <rppt@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: Anshuman Khandual <anshuman.khandual@arm.com>,
	Ard Biesheuvel <ardb@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	David Hildenbrand <david@redhat.com>,
	Marc Zyngier <maz@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Mike Rapoport <rppt@kernel.org>,
	Mike Rapoport <rppt@linux.ibm.com>, Will Deacon <will@kernel.org>,
	kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org
Subject: [PATCH v1 0/4] arm64: drop pfn_valid_within() and simplify pfn_valid()
Date: Tue, 20 Apr 2021 12:09:21 +0300	[thread overview]
Message-ID: <20210420090925.7457-1-rppt@kernel.org> (raw)

From: Mike Rapoport <rppt@linux.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 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.

Changes since RFC
Link: https://lore.kernel.org/lkml/20210407172607.8812-1-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.

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   |  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 +-
 include/linux/memblock.h        |  4 +++-
 include/linux/mmzone.h          | 11 +++++++++++
 mm/memblock.c                   | 28 ++++++++++++++++++++++++++--
 10 files changed, 54 insertions(+), 13 deletions(-)

base-commit: e49d033bddf5b565044e2abe4241353959bc9120
-- 
2.28.0


             reply	other threads:[~2021-04-20  9:09 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-20  9:09 Mike Rapoport [this message]
2021-04-20  9:09 ` [PATCH v1 1/4] include/linux/mmzone.h: add documentation for pfn_valid() Mike Rapoport
2021-04-20  9:22   ` David Hildenbrand
2021-04-20 12:57     ` Mike Rapoport
2021-04-20 12:58       ` David Hildenbrand
2021-04-20  9:09 ` [PATCH v1 2/4] memblock: update initialization of reserved pages Mike Rapoport
2021-04-20 13:56   ` David Hildenbrand
2021-04-20 15:03     ` Mike Rapoport
2021-04-20 15:18       ` David Hildenbrand
2021-04-20 15:25         ` Mike Rapoport
2021-04-20  9:09 ` [PATCH v1 3/4] arm64: decouple check whether pfn is in linear map from pfn_valid() Mike Rapoport
2021-04-20 15:57   ` David Hildenbrand
2021-04-21  5:32     ` Mike Rapoport
2021-04-20  9:09 ` [PATCH v1 4/4] arm64: drop pfn_valid_within() and simplify pfn_valid() Mike Rapoport
2021-04-20 16:00   ` David Hildenbrand
2021-04-21  5:52     ` Mike Rapoport

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