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| author | Sumit Bhattacharya | 2011-11-24 00:47:12 +0100 |
|---|---|---|
| committer | Russell King | 2011-11-26 22:58:53 +0100 |
| commit | ea2e7057c0234cfb8b09467d8f137760d371fc72 (patch) | |
| tree | 222c2f1e8a9a51b2a0e78ae347cd991629411410 /arch/arm/mm/dma-mapping.c | |
| parent | ARM: 7171/1: unwind: add unwind directives to bitops assembly macros (diff) | |
| download | kernel-qcow2-linux-ea2e7057c0234cfb8b09467d8f137760d371fc72.tar.gz kernel-qcow2-linux-ea2e7057c0234cfb8b09467d8f137760d371fc72.tar.xz kernel-qcow2-linux-ea2e7057c0234cfb8b09467d8f137760d371fc72.zip | |
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 3611553ef985ef7c5863c8a94641738addd04cff).
[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>
Diffstat (limited to 'arch/arm/mm/dma-mapping.c')
| -rw-r--r-- | arch/arm/mm/dma-mapping.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index ab584569930e..1aa664a1999f 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -332,6 +332,15 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp, struct page *page; 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; size = PAGE_ALIGN(size); |