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From: Mike Rapoport <rppt@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
	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 v3 0/4] arm64: drop pfn_valid_within() and simplify pfn_valid()
Date: Thu, 22 Apr 2021 09:18:58 +0300	[thread overview]
Message-ID: <20210422061902.21614-1-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.

v3:
* 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            | 16 ++++++++++++++--
 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, 61 insertions(+), 14 deletions(-)

base-commit: e49d033bddf5b565044e2abe4241353959bc9120
-- 
2.28.0


             reply	other threads:[~2021-04-22  6:19 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-22  6:18 Mike Rapoport [this message]
2021-04-22  6:18 ` [PATCH v3 1/4] include/linux/mmzone.h: add documentation for pfn_valid() Mike Rapoport
2021-04-22  6:19 ` [PATCH v3 2/4] memblock: update initialization of reserved pages Mike Rapoport
2021-04-22  6:19 ` [PATCH v3 3/4] arm64: decouple check whether pfn is in linear map from pfn_valid() Mike Rapoport
2021-04-22  8:57   ` David Hildenbrand
2021-04-22  6:19 ` [PATCH v3 4/4] arm64: drop pfn_valid_within() and simplify pfn_valid() Mike Rapoport
2021-04-22  7:50 ` [RFC V2] mm: Enable generic pfn_valid() to handle early sections with memmap holes Anshuman Khandual
2021-04-22  8:27   ` Mike Rapoport
2021-04-22 11:23     ` Anshuman Khandual
2021-04-22 12:19       ` Mike Rapoport
2021-04-22  9:03   ` David Hildenbrand
2021-04-22  9:42     ` Mike Rapoport
2021-04-22  9:48       ` David Hildenbrand
2021-04-22 10:03         ` Mike Rapoport
2021-04-22  9:59       ` Anshuman Khandual
2021-05-24  4:58   ` Anshuman Khandual
2021-05-24  6:52     ` Mike Rapoport
2021-05-25  6:00       ` Anshuman Khandual
2021-05-25  6:32         ` Mike Rapoport
2021-05-25  9:52           ` Anshuman Khandual
2021-05-25 10:03             ` Mike Rapoport
2021-05-25 10:04               ` David Hildenbrand

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