[0/2] mm/vma: some new flags

Message

Anshuman Khandual March 5, 2020, 6:50 a.m. UTC

The motivation here is to consolidate VMA flag combinations commonly used
across platforms and reduce code duplication while making it uncluttered
in general.

This first introduces a default VM_DATA_DEFAULT_FLAGS which platforms can
easily fall back on without requiring to define any similar data flag
combinations as they currently do. This also adds some more common data
flag combinations which are generally used when the platforms decide to
override the default.

The second patch consolidates VM_READ, VM_WRITE, VM_EXEC as VM_ACCESS_FLAGS
extending the existing VMA accessibility concept via vma_is_accessibility().
VM_ACCESS_FLAGS replaces many other instances which used check all three
VMA access flags simultaneously.

This series is based on v5.6-rc4 after applying these.

1. https://patchwork.kernel.org/cover/11399319/
2. https://patchwork.kernel.org/patch/11399379/

Changes in V1:

- Dropped the [PATCH 3/3] which was adding more vma_is_* wrappers
- Used VM_DATA_FLAGS_EXEC for VM_DATA_DEFAULT_FLAGS instead per Vlastimil
- Dropped init use cases for VM_ACCESS_FLAGS as suggested by Vlastimil

Changes in RFC: (https://patchwork.kernel.org/project/linux-mm/list/?series=249733)

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Anshuman Khandual (2):
  mm/vma: Define a default value for VM_DATA_DEFAULT_FLAGS
  mm/vma: Introduce VM_ACCESS_FLAGS

 arch/alpha/include/asm/page.h        |  3 ---
 arch/arc/include/asm/page.h          |  2 +-
 arch/arm/include/asm/page.h          |  4 +---
 arch/arm/mm/fault.c                  |  2 +-
 arch/arm64/include/asm/page.h        |  4 +---
 arch/arm64/mm/fault.c                |  2 +-
 arch/c6x/include/asm/page.h          |  5 +----
 arch/csky/include/asm/page.h         |  3 ---
 arch/h8300/include/asm/page.h        |  2 --
 arch/hexagon/include/asm/page.h      |  3 +--
 arch/ia64/include/asm/page.h         |  5 +----
 arch/m68k/include/asm/page.h         |  3 ---
 arch/microblaze/include/asm/page.h   |  2 --
 arch/mips/include/asm/page.h         |  5 +----
 arch/nds32/include/asm/page.h        |  3 ---
 arch/nds32/mm/fault.c                |  2 +-
 arch/nios2/include/asm/page.h        |  3 +--
 arch/openrisc/include/asm/page.h     |  5 -----
 arch/parisc/include/asm/page.h       |  3 ---
 arch/powerpc/include/asm/page.h      |  9 ++-------
 arch/powerpc/include/asm/page_64.h   |  7 ++-----
 arch/powerpc/mm/book3s64/pkeys.c     |  2 +-
 arch/riscv/include/asm/page.h        |  3 +--
 arch/s390/include/asm/page.h         |  3 +--
 arch/s390/mm/fault.c                 |  2 +-
 arch/sh/include/asm/page.h           |  3 ---
 arch/sparc/include/asm/page_32.h     |  3 ---
 arch/sparc/include/asm/page_64.h     |  3 ---
 arch/unicore32/include/asm/page.h    |  3 ---
 arch/unicore32/mm/fault.c            |  2 +-
 arch/x86/include/asm/page_types.h    |  4 +---
 arch/x86/mm/pkeys.c                  |  2 +-
 arch/x86/um/asm/vm-flags.h           | 10 ++--------
 arch/xtensa/include/asm/page.h       |  3 ---
 drivers/staging/gasket/gasket_core.c |  2 +-
 include/linux/mm.h                   | 20 +++++++++++++++++++-
 mm/mmap.c                            |  2 +-
 mm/mprotect.c                        |  4 ++--
 38 files changed, 47 insertions(+), 101 deletions(-)