[PATCH 0/2] arm64/mm: Enable THP migration

[Anshuman Khandual]

This series enables THP migration on arm64 via ARCH_ENABLE_THP_MIGRATION.
But first this modifies all existing THP helpers like pmd_present() and
pmd_trans_huge() etc per expected generic memory semantics as concluded
from a previous discussion here.

https://lkml.org/lkml/2018/10/9/220

This series is based on v5.9-rc1.

Changes in V1:

- Used new PMD_PRESENT_INVALID (bit 59) to represent invalidated PMD state per Catalin

Changes in RFC V2: (https://patchwork.kernel.org/project/linux-mm/list/?series=302965)

- Used PMD_TABLE_BIT to represent splitting PMD state per Catalin

Changes in RFC V1: (https://patchwork.kernel.org/project/linux-mm/list/?series=138797)

Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will at kernel.org>
Cc: Mark Rutland <mark.rutland at arm.com>
Cc: Marc Zyngier <maz at kernel.org>
Cc: Suzuki Poulose <suzuki.poulose at arm.com>
Cc: Zi Yan <ziy at nvidia.com>
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-kernel at vger.kernel.org

Anshuman Khandual (2):
  arm64/mm: Change THP helpers to comply with generic MM semantics
  arm64/mm: Enable THP migration

 arch/arm64/Kconfig                    |  4 +++
 arch/arm64/include/asm/pgtable-prot.h |  7 +++++
 arch/arm64/include/asm/pgtable.h      | 39 ++++++++++++++++++++++++---
 3 files changed, 47 insertions(+), 3 deletions(-)

-- 
2.20.1