[PATCH V2 0/2] arm64/mm: Fix pfn_valid() for ZONE_DEVICE based memory

Anshuman Khandual anshuman.khandual at arm.com
Mon Feb 1 23:11:52 EST 2021

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 at arm.com>
Cc: Will Deacon <will at kernel.org>
Cc: Ard Biesheuvel <ardb at kernel.org>
Cc: Mark Rutland <mark.rutland at arm.com>
Cc: James Morse <james.morse at arm.com>
Cc: Robin Murphy <robin.murphy at arm.com>
Cc: Jérôme Glisse <jglisse at redhat.com>
Cc: Dan Williams <dan.j.williams at intel.com>
Cc: David Hildenbrand <david at redhat.com>
Cc: Mike Rapoport <rppt at linux.ibm.com>
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-mm at kvack.org
Cc: linux-kernel at vger.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:


- Test pfn_section_valid() for non boot memory

Changes in RFC:


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(-)


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