evie/android_kernel_oneplus_msm8998
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UPSTREAM: arm64: mm: allow sections for unaligned bases

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Callees of __create_mapping may decide to create section mappings if
sufficient low bits of the physical and virtual addresses they were
passed are zero. While __create_mapping rounds the virtual base address
down, it does not similarly round the physical base address down, and
hence non-zero bits in the physical address can prevent use of a section
mapping, even where a whole next-level table would be used instead.

Round down the physical base address in __create_mapping to enable all
callees to always create section mappings when such a mapping is
possible.

Cc: Laura Abbott <labbott@fedoraproject.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Steve Capper <steve.capper@linaro.org>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

Bug: 30369029
Patchset: __create_mapping-fixes

(cherry picked from commit 9c4e08a3022b6df90d31ef4007291faabfce5431)
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
Change-Id: Ic447350efdba3cd9f9e101c72183e04e39dd28d2
This commit is contained in:
Mark Rutland 2015-11-23 13:26:20 +00:00 • committed by Jeff Vander Stoep
parent 5b432907fe
commit ab8158d220
1 changed files with 1 additions and 0 deletions
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arch/arm64/mm/mmu.c
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@ -258,6 +258,7 @@ static void __create_mapping(struct mm_struct *mm, pgd_t *pgd,
if (WARN_ON((phys ^ virt) & ~PAGE_MASK))
return;
phys &= PAGE_MASK;
addr = virt & PAGE_MASK;
length = PAGE_ALIGN(size + (virt & ~PAGE_MASK));