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[AVR32] Drop GFP_COMP for DMA memory allocations

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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 was forward-ported from BSP 2.0

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
This commit is contained in:
Haavard Skinnemoen 2007-07-05 17:08:09 +02:00
parent 49914084e7
commit 3611553ef9
1 changed files with 7 additions and 0 deletions
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7
arch/avr32/mm/dma-coherent.c
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@ -41,6 +41,13 @@ static struct page *__dma_alloc(struct device *dev, size_t size,
struct page *page, *free, *end;
int order;
/* 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 AVR32 as it is not supported on this
* platform--see CONFIG_HUGETLB_PAGE. */
gfp &= ~(__GFP_COMP);
size = PAGE_ALIGN(size);
order = get_order(size);