[PATCH rfc -next 00/10] mm: convert to generic VMA lock-based page fault

From: Kefeng Wang
Date: Thu Jul 13 2023 - 05:39:13 EST


Add a generic VMA lock-based page fault handler in mm core, and convert
architectures to use it, which eliminate architectures's duplicated codes.

With it, we can avoid multiple changes in architectures's code if we
add new feature or bugfix.

This fixes riscv missing change about commit 38b3aec8e8d2 "mm: drop per-VMA
lock when returning VM_FAULT_RETRY or VM_FAULT_COMPLETED", and in the end,
we enable this feature on ARM32/Loongarch too.

This is based on next-20230713, only built test(no loongarch compiler,
so except loongarch).

Kefeng Wang (10):
mm: add a generic VMA lock-based page fault handler
x86: mm: use try_vma_locked_page_fault()
arm64: mm: use try_vma_locked_page_fault()
s390: mm: use try_vma_locked_page_fault()
powerpc: mm: use try_vma_locked_page_fault()
riscv: mm: use try_vma_locked_page_fault()
ARM: mm: try VMA lock-based page fault handling first
loongarch: mm: cleanup __do_page_fault()
loongarch: mm: add access_error() helper
loongarch: mm: try VMA lock-based page fault handling first

arch/arm/Kconfig | 1 +
arch/arm/mm/fault.c | 15 ++++++-
arch/arm64/mm/fault.c | 28 +++---------
arch/loongarch/Kconfig | 1 +
arch/loongarch/mm/fault.c | 92 ++++++++++++++++++++++++---------------
arch/powerpc/mm/fault.c | 54 ++++++++++-------------
arch/riscv/mm/fault.c | 38 +++++++---------
arch/s390/mm/fault.c | 23 +++-------
arch/x86/mm/fault.c | 39 +++++++----------
include/linux/mm.h | 28 ++++++++++++
mm/memory.c | 42 ++++++++++++++++++
11 files changed, 206 insertions(+), 155 deletions(-)

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2.27.0