From: Mark Rutland Date: Mon, 23 Nov 2015 13:26:20 +0000 (+0000) Subject: arm64: mm: allow sections for unaligned bases X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9c4e08a3022b6df90d31ef4007291faabfce5431;p=linux-beck.git 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 Acked-by: Ard Biesheuvel Acked-by: Catalin Marinas Reviewed-by: Steve Capper Signed-off-by: Mark Rutland Signed-off-by: Will Deacon --- diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 6e4b4351ce9e..bb42ac116a25 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -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));