[PATCH Resend v2 0/3] ARM: Support KFENCE feature

[Kefeng Wang]

This patchset supports Kfence feature, tested the kfence_test on ARM QEMU
with or without ARM_LPAE and all passed.

V2 Resend:
- adjust is_write_fault() position in patch2 not patch3, sugguested Alexander
- Add ACKed from Marco
- rebased on v5.16-rc1

V2:
- drop patch4 in v1, which is used a new way to skip kfence test
  see commit c40c6e593bf9 ("kfence: test: fail fast if disabled at boot")
- fix some issue about NO MMU
  - drop useless set_memory_valid() under no mmu
  - fix implicit declaration of function ‘is_write_fault’ if no mmu
- make KFENCE depends on !XIP_KERNEL, no tested with xip

v1:
https://lore.kernel.org/linux-arm-kernel/20210825092116.149975-1-wangkefeng.wang@xxxxxxxxxx/

Kefeng Wang (3):
  ARM: mm: Provide set_memory_valid()
  ARM: mm: Provide is_write_fault()
  ARM: Support KFENCE for ARM

 arch/arm/Kconfig                  |  1 +
 arch/arm/include/asm/kfence.h     | 53 +++++++++++++++++++++++++++++++
 arch/arm/include/asm/set_memory.h |  1 +
 arch/arm/mm/fault.c               | 16 ++++++++--
 arch/arm/mm/pageattr.c            | 42 ++++++++++++++++++------
 5 files changed, 100 insertions(+), 13 deletions(-)
 create mode 100644 arch/arm/include/asm/kfence.h

-- 
2.26.2