Searched hist:cc5d2b3b95cdbb3fed4e38e667d17b9ac7250f7a (Results 1 – 1 of 1) sorted by relevance
| /openbmc/linux/arch/arm64/mm/ |
| H A D | mmu.c | diff cc5d2b3b95cdbb3fed4e38e667d17b9ac7250f7a Mon Nov 23 07:26:19 CST 2015 Mark Rutland <mark.rutland@arm.com> arm64: mm: detect bad __create_mapping uses
If a caller of __create_mapping provides a PA and VA which have
different sub-page offsets, it is not clear which offset they expect to
apply to the mapping, and is indicative of a bad caller.
In some cases, the region we wish to map may validly have a sub-page
offset in the physical and virtual addresses. For example, EFI runtime
regions have 4K granularity, yet may be mapped by a 64K page kernel. So
long as the physical and virtual offsets are the same, the region will
be mapped at the expected VAs.
Disallow calls with differing sub-page offsets, and WARN when they are
encountered, so that we can detect and fix such cases.
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>
|