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| author | Haavard Skinnemoen <hskinnemoen@atmel.com> | 2007-07-05 17:08:09 +0200 |
|---|---|---|
| committer | Haavard Skinnemoen <hskinnemoen@atmel.com> | 2008-01-25 08:31:39 +0100 |
| commit | 3611553ef985ef7c5863c8a94641738addd04cff (patch) | |
| tree | 5eca5f85e16514ee8c0c2122d74693073067c9a9 | |
| parent | 49914084e797530d9baaf51df9eda77babc98fa8 (diff) | |
| download | linux-3611553ef985ef7c5863c8a94641738addd04cff.tar.gz linux-3611553ef985ef7c5863c8a94641738addd04cff.tar.xz | |
[AVR32] 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 was forward-ported from BSP 2.0
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
| -rw-r--r-- | arch/avr32/mm/dma-coherent.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/avr32/mm/dma-coherent.c b/arch/avr32/mm/dma-coherent.c index 177fea8f7b71..6d8c794c3b81 100644 --- a/arch/avr32/mm/dma-coherent.c +++ b/arch/avr32/mm/dma-coherent.c @@ -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); |