arm64: mm: allow sections for unaligned bases
authorMark Rutland <mark.rutland@arm.com>
Mon, 23 Nov 2015 13:26:20 +0000 (13:26 +0000)
committerWill Deacon <will.deacon@arm.com>
Tue, 1 Dec 2015 09:47:03 +0000 (09:47 +0000)
commit9c4e08a3022b6df90d31ef4007291faabfce5431
tree2db2d24ea259598910e21d0eecb261ff0a2bc519
parentcc5d2b3b95cdbb3fed4e38e667d17b9ac7250f7a
arm64: mm: allow sections for unaligned bases

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>
arch/arm64/mm/mmu.c