arm64: pgtable: Ensure dirty bit is preserved across pte_wrprotect()

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With hardware dirty bit management, calling pte_wrprotect() on a writable,
dirty PTE will lose the dirty state and return a read-only, clean entry.

Move the logic from ptep_set_wrprotect() into pte_wrprotect() to ensure that
the dirty bit is preserved for writable entries, as this is required for
soft-dirty bit management if we enable it in the future.

Cc: <stable@vger.kernel.org>
Fixes: 2f4b829c62 ("arm64: Add support for hardware updates of the access and dirty pte bits")
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20201120143557.6715-3-will@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>

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Will Deacon 2020-11-20 13:57:48 +00:00

parent 07509e10dc

commit ff1712f953

1 changed files with 14 additions and 13 deletions

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arch/arm64/include/asm/pgtable.h

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