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[0/5] arm64/mm: Drop PXD_TABLE_BIT

Message ID 20241005123824.1366397-1-anshuman.khandual@arm.com (mailing list archive)
Headers show
Series arm64/mm: Drop PXD_TABLE_BIT | expand

Message

Anshuman Khandual Oct. 5, 2024, 12:38 p.m. UTC 
Clearing PXD_TABLE_BIT i.e bit[1] on a page table entry always operates on
the assumption that subsequent PXD_VALID i.e bit[0] is set. That's because
bits[1:0]="01" makes a block mapping. So it is prudent to treat bits[1:0]
as a single register field, which should be updated as block or table etc.
Although mk_[pmd|pud]_sect_prot() helpers go to some extent in using these
PXD_TYPE_SECT macros, their usage is not really consistent else where.

This series removes these table bit clearing for block mapping creation and
eventually completely drops off those table macros.

This series applies on v6.12-rc1.

Cc: Marc Zyngier <maz@kernel.org>
Cc: Oliver Upton <oliver.upton@linux.dev>
Cc: James Morse <james.morse@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: kvmarm@lists.linux.dev
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org

Anshuman Khandual (5):
  arm64/mm: Drop pte_mkhuge()
  arm64/mm: Replace PXD_TABLE_BIT with PXD_TYPE_[MASK|SECT]
  arm64/ptdump: Test PMD_TYPE_MASK for block mapping
  KVM: arm64: ptdump: Test PMD_TYPE_MASK for block mapping
  arm64/mm: Drop PXD_TABLE_BIT

 arch/arm64/include/asm/pgtable-hwdef.h |  6 +-----
 arch/arm64/include/asm/pgtable.h       | 20 ++++++++------------
 arch/arm64/kvm/ptdump.c                |  4 ++--
 arch/arm64/mm/hugetlbpage.c            |  2 +-
 arch/arm64/mm/ptdump.c                 |  8 ++++----
 5 files changed, 16 insertions(+), 24 deletions(-)