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mm: cma: fix alignment requirements for contiguous regions 

Contiguous Memory Allocator requires each of its regions to be aligned
in such a way that it is possible to change migration type for all
pageblocks holding it and then isolate page of largest possible order from
the buddy allocator (which is MAX_ORDER-1). This patch relaxes alignment
requirements by one order, because MAX_ORDER alignment is not really
needed.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
CC: Michal Nazarewicz <mina86@mina86.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
This commit is contained in:
Marek Szyprowski 2012-08-27 20:27:19 +02:00
parent fea7a08acb
commit 7ce9bf1f47
1 changed files with 1 additions and 1 deletions
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2
drivers/base/dma-contiguous.c
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@ -250,7 +250,7 @@ int __init dma_declare_contiguous(struct device *dev, unsigned long size,
return -EINVAL;
/* Sanitise input arguments */
alignment = PAGE_SIZE << max(MAX_ORDER, pageblock_order);
alignment = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order);
base = ALIGN(base, alignment);
size = ALIGN(size, alignment);
limit &= ~(alignment - 1);