forked from Minki/linux
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>
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@ -258,6 +258,7 @@ static void __create_mapping(struct mm_struct *mm, pgd_t *pgd,
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if (WARN_ON((phys ^ virt) & ~PAGE_MASK))
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return;
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phys &= PAGE_MASK;
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addr = virt & PAGE_MASK;
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length = PAGE_ALIGN(size + (virt & ~PAGE_MASK));
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