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kmemcheck: add hooks for page- and sg-dma-mappings
This is needed for page allocator support to prevent false positives when accessing pages which are dma-mapped. [rebased for mainline inclusion] Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
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1 changed files with 5 additions and 0 deletions
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@ -89,8 +89,12 @@ dma_map_sg(struct device *hwdev, struct scatterlist *sg,
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{
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struct dma_map_ops *ops = get_dma_ops(hwdev);
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int ents;
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struct scatterlist *s;
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int i;
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BUG_ON(!valid_dma_direction(dir));
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for_each_sg(sg, s, nents, i)
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kmemcheck_mark_initialized(sg_virt(s), s->length);
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ents = ops->map_sg(hwdev, sg, nents, dir, NULL);
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debug_dma_map_sg(hwdev, sg, nents, ents, dir);
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@ -202,6 +206,7 @@ static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
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dma_addr_t addr;
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BUG_ON(!valid_dma_direction(dir));
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kmemcheck_mark_initialized(page_address(page) + offset, size);
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addr = ops->map_page(dev, page, offset, size, dir, NULL);
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debug_dma_map_page(dev, page, offset, size, dir, addr, false);
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