[PATCH V2 0/2] arm64/mm: Enable THP migration

From: Anshuman Khandual
Date: Wed Sep 09 2020 - 00:53:47 EST

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.


This series is based on v5.9-rc4.

Changes in V2:

- Renamed clr_pmd_bit() as clear_pmd_bit() per Catalin
- Updated in-code documentation per Catalin and Ralph
- Updated commit message in the first patch per Catalin
- Updated commit message in the second patch per Catalin
- Added tags from Catalin

Changes in V1: (https://patchwork.kernel.org/project/linux-mm/list/?series=333627)

- 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@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Marc Zyngier <maz@xxxxxxxxxx>
Cc: Suzuki Poulose <suzuki.poulose@xxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx

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(-)