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ARM: 7172/1: dma: Drop GFP_COMP for DMA memory allocations 

dma_alloc_coherent wants to split pages after allocation in order to
reduce the memory footprint. This does not work well with GFP_COMP
pages, so drop this flag before allocation.

This patch is ported from arch/avr32
(commit 3611553ef9).

[swarren: s/HUGETLB_PAGE/HUGETLBFS/ in comment, minor comment cleanup]

Signed-off-by: Sumit Bhattacharya <sumitb@nvidia.com>
Tested-by: Varun Colbert <vcolbert@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Sumit Bhattacharya 2011-11-24 00:47:12 +01:00 committed by Russell King
parent c36ef4b176
commit ea2e7057c0
1 changed files with 9 additions and 0 deletions
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9
arch/arm/mm/dma-mapping.c
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@ -332,6 +332,15 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
struct page *page; struct page *page;
void *addr; void *addr;
/*
* Following is a work-around (a.k.a. hack) to prevent pages
* with __GFP_COMP being passed to split_page() which cannot
* handle them. The real problem is that this flag probably
* should be 0 on ARM as it is not supported on this
* platform; see CONFIG_HUGETLBFS.
*/
gfp &= ~(__GFP_COMP);
*handle = ~0; *handle = ~0;
size = PAGE_ALIGN(size); size = PAGE_ALIGN(size);