arm64: Move PTE_RDONLY bit handling out of set_pte_at()

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Currently PTE_RDONLY is treated as a hardware only bit and not handled
by the pte_mkwrite(), pte_wrprotect() or the user PAGE_* definitions.
The set_pte_at() function is responsible for setting this bit based on
the write permission or dirty state. This patch moves the PTE_RDONLY
handling out of set_pte_at into the pte_mkwrite()/pte_wrprotect()
functions. The PAGE_* definitions to need to be updated to explicitly
include PTE_RDONLY when !PTE_WRITE.

The patch also removes the redundant PAGE_COPY(_EXEC) definitions as
they are identical to the corresponding PAGE_READONLY(_EXEC).

Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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This commit is contained in:

Catalin Marinas 2017-07-04 19:04:18 +01:00

parent 0966253d7c

commit 73e86cb03c

4 changed files with 21 additions and 41 deletions

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18

arch/arm64/include/asm/pgtable-prot.h

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34

arch/arm64/include/asm/pgtable.h

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4

arch/arm64/kernel/hibernate.c

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6

arch/arm64/mm/fault.c

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