dma-mapping: reject __GFP_COMP in dma_alloc_attrs

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DMA allocations can never be turned back into a page pointer, so
requesting compound pages doesn't make sense and it can't even be
supported at all by various backends.

Reject __GFP_COMP with a warning in dma_alloc_attrs, and stop clearing
the flag in the arm dma ops and dma-iommu.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>

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This commit is contained in:

Christoph Hellwig 2022-11-09 08:37:17 +01:00

parent 3306877aff

commit ffcb754584

3 changed files with 8 additions and 20 deletions

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17

arch/arm/mm/dma-mapping.c

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3

drivers/iommu/dma-iommu.c

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8

kernel/dma/mapping.c

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