The patch titled
Subject: mm: cma: fix alignment requirements for contiguous regions
has been added to the -mm tree. Its filename is
mm-cma-fix-alignment-requirements-for-contiguous-regions.patch
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------------------------------------------------------
From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Subject: 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@xxxxxxxxxxx>
Cc: Michal Nazarewicz <mina86@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/base/dma-contiguous.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN drivers/base/dma-contiguous.c~mm-cma-fix-alignment-requirements-for-contiguous-regions drivers/base/dma-contiguous.c
--- a/drivers/base/dma-contiguous.c~mm-cma-fix-alignment-requirements-for-contiguous-regions
+++ a/drivers/base/dma-contiguous.c
@@ -250,7 +250,7 @@ int __init dma_declare_contiguous(struct
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);
_
Patches currently in -mm which might be from m.szyprowski@xxxxxxxxxxx are
linux-next.patch
mm-cma-fix-alignment-requirements-for-contiguous-regions.patch
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