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| author | Richard Zhao <rizhao@nvidia.com> | 2013-06-20 16:31:00 +0400 |
|---|---|---|
| committer | Marek Szyprowski <m.szyprowski@samsung.com> | 2013-06-28 17:14:29 +0400 |
| commit | 5b91a98c61abe914e6a80d7dc15e435c47ea0004 (patch) | |
| tree | c3008ef76f84869617457031453e79e56686a543 /arch/arm/mm | |
| parent | 63c181922f25371b7d24ef63d4e15887ff23a088 (diff) | |
| download | linux-5b91a98c61abe914e6a80d7dc15e435c47ea0004.tar.xz | |
ARM: dma: Drop __GFP_COMP for iommu dma memory allocations
__iommu_alloc_buffer 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
One failure example is snd_malloc_dev_pages call dma_alloc_coherent with
__GFP_COMP.
Signed-off-by: Richard Zhao <rizhao@nvidia.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Diffstat (limited to 'arch/arm/mm')
| -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 97926b1277b2..22c7d7eb35a0 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -1328,6 +1328,15 @@ static void *arm_iommu_alloc_attrs(struct device *dev, size_t size, if (gfp & GFP_ATOMIC) return __iommu_alloc_atomic(dev, size, handle); + /* + * 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); + pages = __iommu_alloc_buffer(dev, size, gfp, attrs); if (!pages) return NULL; |