linux-kernel - [PATCH V2 0/2] arm64/mm: Fix pfn_valid() for ZONE

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Date:   Tue,  2 Feb 2021 09:41:52 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        James Morse <james.morse@....com>,
        Robin Murphy <robin.murphy@....com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        David Hildenbrand <david@...hat.com>,
        Mike Rapoport <rppt@...ux.ibm.com>
Subject: [PATCH V2 0/2] arm64/mm: Fix pfn_valid() for ZONE_DEVICE based memory

This series fixes pfn_valid() for ZONE_DEVICE based memory and also improves
its performance for normal hotplug memory. While here, it also reorganizes
pfn_valid() on CONFIG_SPARSEMEM. This series is based on v5.11-rc6.

Question - should pfn_section_valid() be tested both for boot and non boot
memory as well ?

Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>
Cc: Ard Biesheuvel <ardb@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: James Morse <james.morse@....com>
Cc: Robin Murphy <robin.murphy@....com>
Cc: Jérôme Glisse <jglisse@...hat.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: David Hildenbrand <david@...hat.com>
Cc: Mike Rapoport <rppt@...ux.ibm.com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org

Changes in V2:

- Dropped pfn_valid() bifurcation based on CONFIG_SPARSEMEM
- Used PFN_PHYS() and PHYS_PFN() instead of __pfn_to_phys() and __phys_to_pfn()
- Moved __pfn_to_section() inside #ifdef CONFIG_SPARSEMEM with a { } construct

Changes in V1:

https://lore.kernel.org/linux-mm/1611905986-20155-1-git-send-email-anshuman.khandual@arm.com/

- Test pfn_section_valid() for non boot memory

Changes in RFC:

https://lore.kernel.org/linux-arm-kernel/1608621144-4001-1-git-send-email-anshuman.khandual@arm.com/

Anshuman Khandual (2):
  arm64/mm: Fix pfn_valid() for ZONE_DEVICE based memory
  arm64/mm: Reorganize pfn_valid()

 arch/arm64/mm/init.c | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

-- 
2.20.1