The patch 1~3 is to support KFENCE feature on ARM. 

NOTE: 
The context of patch2/3 changes in arch/arm/mm/fault.c is based on link[1],
which make some refactor and cleanup about page fault.

kfence_test is not useful when kfence is not enabled, skip kfence test
when kfence not enabled in patch4.

I tested the kfence_test on ARM QEMU with or without ARM_LPAE and all passed.

[1] https://lore.kernel.org/linux-arm-kernel/20210610123556.171328-1-wangkefeng.wang@huawei.com/ (local)

Kefeng Wang (4):
  ARM: mm: Provide set_memory_valid()
  ARM: mm: Provide is_write_fault()
  ARM: Support KFENCE for ARM
  mm: kfence: Only load kfence_test when kfence is enabled

 arch/arm/Kconfig                  |  1 +
 arch/arm/include/asm/kfence.h     | 52 +++++++++++++++++++++++++++++++
 arch/arm/include/asm/set_memory.h |  5 +++
 arch/arm/mm/fault.c               | 16 ++++++++--
 arch/arm/mm/pageattr.c            | 41 ++++++++++++++++++------
 include/linux/kfence.h            |  2 ++
 mm/kfence/core.c                  |  8 +++++
 mm/kfence/kfence_test.c           |  2 ++
 8 files changed, 114 insertions(+), 13 deletions(-)
 create mode 100644 arch/arm/include/asm/kfence.h

-- 
2.26.2


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