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ARM: mm: HugeTLB support for LPAE systems.

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This patch adds support for hugetlbfs based on the x86 implementation.
It allows mapping of 2MB sections (see Documentation/vm/hugetlbpage.txt
for usage). The 64K pages configuration is not supported (section size
is 512MB in this case).

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
[steve.capper@linaro.org: symbolic constants replace numbers in places.
Split up into multiple files, to simplify future non-LPAE support,
removed huge_pmd_share code, as this is very rarely executed,
Added PROT_NONE support].
Signed-off-by: Steve Capper <steve.capper@linaro.org>
Reviewed-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Catalin Marinas
2012-07-25 14:32:38 +01:00
committed by Steve Capper
parent 0b19f93351
commit 1355e2a6eb
9 changed files with 276 additions and 2 deletions
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2
arch/arm/mm/dma-mapping.c
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@@ -250,7 +250,7 @@ static void __dma_free_buffer(struct page *page, size_t size)
#ifdef CONFIG_MMU
#ifdef CONFIG_HUGETLB_PAGE
#error ARM Coherent DMA allocator does not (yet) support huge TLB
#warning ARM Coherent DMA allocator does not (yet) support huge TLB
#endif
static void *__alloc_from_contiguous(struct device *dev, size_t size,