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
next 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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