[PATCH -next v4 0/4]mm: page_table_check: add support on arm64 and riscv

[Tong Tiangen <tongtiangen@huawei.com>]

Page table check performs extra verifications at the time when new
pages become accessible from the userspace by getting their page
table entries (PTEs PMDs etc.) added into the table. It is supported
on X86[1].

This patchset made some simple changes and make it easier to support
new architecture, then we support this feature on ARM64 and RISCV.

[1]https://lore.kernel.org/lkml/20211123214814.3756047-1-pasha.tatashin@soleen.com/

v3 -> v4:
 1. Adapt to next-20220414

v2 -> v3:
  1. Modify ptep_clear() in include/linux/pgtable.h, using IS_ENABLED 
     according to the suggestions of Pasha.

v1 -> v2:
  1. Fix arm64's pte/pmd/pud_user_accessible_page() according to the
     suggestions of Catalin.
  2. Also fix riscv's pte_pmd_pud_user_accessible_page().

Kefeng Wang (2):
  mm: page_table_check: move pxx_user_accessible_page into x86
  arm64: mm: add support for page table check

Tong Tiangen (2):
  mm: page_table_check: add hooks to public helpers
  riscv: mm: add support for page table check

 arch/arm64/Kconfig               |  1 +
 arch/arm64/include/asm/pgtable.h | 65 ++++++++++++++++++++++++---
 arch/riscv/Kconfig               |  1 +
 arch/riscv/include/asm/pgtable.h | 77 +++++++++++++++++++++++++++++---
 arch/x86/include/asm/pgtable.h   | 29 +++++++-----
 include/linux/pgtable.h          | 26 +++++++----
 mm/page_table_check.c            | 25 ++++-------
 7 files changed, 178 insertions(+), 46 deletions(-)

-- 
2.25.1