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Commit 3676f9ef authored by Catalin Marinas's avatar Catalin Marinas
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arm64: Move PTE_PROT_NONE higher up



PTE_PROT_NONE means that a pte is present but does not have any
read/write attributes. However, setting the memory type like
pgprot_writecombine() is allowed and such bits overlap with
PTE_PROT_NONE. This causes mmap/munmap issues in drivers that change the
vma->vm_pg_prot on PROT_NONE mappings.

This patch reverts the PTE_FILE/PTE_PROT_NONE shift in commit
59911ca4 (ARM64: mm: Move PTE_PROT_NONE bit) and moves PTE_PROT_NONE
together with the other software bits.

Signed-off-by: default avatarSteve Capper <steve.capper@linaro.org>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Tested-by: default avatarSteve Capper <steve.capper@linaro.org>
Cc: <stable@vger.kernel.org> # 3.11+
parent 4f00130b
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