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| author | Marek Szyprowski <m.szyprowski@samsung.com> | 2012-08-27 22:27:19 +0400 |
|---|---|---|
| committer | Marek Szyprowski <m.szyprowski@samsung.com> | 2012-08-28 23:01:01 +0400 |
| commit | 7ce9bf1f4785dab0598a19a7fcb0733a18193e4e (patch) | |
| tree | 258efa17f0398073cad1dbc0663e587b41a4d30f /drivers/base/dma-contiguous.c | |
| parent | fea7a08acb13524b47711625eebea40a0ede69a0 (diff) | |
| download | linux-7ce9bf1f4785dab0598a19a7fcb0733a18193e4e.tar.xz | |
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>
Diffstat (limited to 'drivers/base/dma-contiguous.c')
| -rw-r--r-- | drivers/base/dma-contiguous.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c index 78efb0306a44..34d94c762a1e 100644 --- a/drivers/base/dma-contiguous.c +++ b/drivers/base/dma-contiguous.c @@ -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); |