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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: [RFC/RFT PATCH 0/3] arm64: drop pfn_valid_within() and simplify pfn_valid()
Date: Wed,  7 Apr 2021 20:26:04 +0300	[thread overview]
Message-ID: <20210407172607.8812-1-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.

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


             reply	other threads:[~2021-04-07 17:26 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-07 17:26 Mike Rapoport [this message]
2021-04-07 17:26 ` [RFC/RFT PATCH 1/3] memblock: update initialization of reserved pages Mike Rapoport
2021-04-08  5:16   ` Anshuman Khandual
2021-04-08  5:48     ` Mike Rapoport
2021-04-14 15:12   ` David Hildenbrand
2021-04-14 15:27     ` Ard Biesheuvel
2021-04-14 15:52       ` David Hildenbrand
2021-04-14 20:24         ` Mike Rapoport
2021-04-15  9:30           ` David Hildenbrand
2021-04-16 11:44             ` Mike Rapoport
2021-04-16 11:54               ` David Hildenbrand
2021-04-14 20:11       ` Mike Rapoport
2021-04-14 20:06     ` Mike Rapoport
2021-04-07 17:26 ` [RFC/RFT PATCH 2/3] arm64: decouple check whether pfn is normal memory from pfn_valid() Mike Rapoport
2021-04-08  5:14   ` Anshuman Khandual
2021-04-08  6:00     ` Mike Rapoport
2021-04-14 15:58     ` David Hildenbrand
2021-04-14 20:29       ` Mike Rapoport
2021-04-15  9:31         ` David Hildenbrand
2021-04-16 11:40           ` Mike Rapoport
2021-04-07 17:26 ` [RFC/RFT PATCH 3/3] arm64: drop pfn_valid_within() and simplify pfn_valid() Mike Rapoport
2021-04-08  5:12   ` Anshuman Khandual
2021-04-08  6:17     ` Mike Rapoport
2021-04-08  5:19 ` [RFC/RFT PATCH 0/3] " Anshuman Khandual
2021-04-08  6:27   ` Mike Rapoport

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