Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 7ce9bf1f authored by Marek Szyprowski's avatar Marek Szyprowski
Browse files

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: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
CC: Michal Nazarewicz <mina86@mina86.com>
Acked-by: default avatarMichal Nazarewicz <mina86@mina86.com>
parent fea7a08a

drivers/base/dma-contiguous.c

+1 −1
Original line number Diff line number Diff line
@@ -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);