[PATCH 0/4] ARM: mmu: ensure PTE is written at once

[Ahmad Fatoum]

Writing the PTE with a normal non-volatile access is a bad idea, because
speculation may already use a partially written entry.

Use WRITE_ONCE to turn this into a volatile write via a new set_pte
helper. The extra helper is useful for type enforcement and for future
extension when we start to consistently apply break-before-make[1].

Ahmad Fatoum (4):
  arch: sync READ_ONCE/WRITE_ONCE with Linux
  ARM64: mmu: document granule size calculation
  ARM: mmu: ensure PTE is written at once
  WIP: break before make and don't invalidate uncached regions being
    remapped

 Documentation/devel/porting.rst     |   2 +
 arch/arm/cpu/mmu_32.c               | 247 +++++++++++++++++++++++-----
 arch/arm/cpu/mmu_64.c               |  38 ++++-
 arch/arm/include/asm/barrier.h      |   8 +
 arch/kvx/include/asm/barrier.h      |   2 +
 arch/mips/include/asm/barrier.h     |   8 +
 arch/openrisc/include/asm/barrier.h |   8 +
 arch/powerpc/include/asm/barrier.h  |   8 +
 arch/sandbox/include/asm/barrier.h  |   8 +
 arch/x86/include/asm/barrier.h      |   8 +
 include/asm-generic/barrier.h       |  24 +++
 include/asm-generic/rwonce.h        |  87 ++++++++++
 include/linux/bitops.h              |   2 +-
 include/linux/compiler.h            |  94 -----------
 include/linux/compiler_types.h      |  46 ++++++
 include/linux/list.h                |   1 +
 16 files changed, 449 insertions(+), 142 deletions(-)
 create mode 100644 arch/arm/include/asm/barrier.h
 create mode 100644 arch/mips/include/asm/barrier.h
 create mode 100644 arch/openrisc/include/asm/barrier.h
 create mode 100644 arch/powerpc/include/asm/barrier.h
 create mode 100644 arch/sandbox/include/asm/barrier.h
 create mode 100644 arch/x86/include/asm/barrier.h
 create mode 100644 include/asm-generic/barrier.h
 create mode 100644 include/asm-generic/rwonce.h

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2.39.5