From 9b5cab31897e9e89e36c0c2a89b16b93ff1a971a Mon Sep 17 00:00:00 2001 From: Vegard Nossum Date: Sat, 21 Feb 2009 13:52:37 +0100 Subject: [PATCH] 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 --- arch/x86/include/asm/dma-mapping.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h index d57d0c1..b93405b 100644 --- a/arch/x86/include/asm/dma-mapping.h +++ b/arch/x86/include/asm/dma-mapping.h @@ -89,8 +89,12 @@ dma_map_sg(struct device *hwdev, struct scatterlist *sg, { struct dma_map_ops *ops = get_dma_ops(hwdev); int ents; + struct scatterlist *s; + int i; BUG_ON(!valid_dma_direction(dir)); + for_each_sg(sg, s, nents, i) + kmemcheck_mark_initialized(sg_virt(s), s->length); ents = ops->map_sg(hwdev, sg, nents, dir, NULL); debug_dma_map_sg(hwdev, sg, nents, ents, dir); @@ -202,6 +206,7 @@ static inline dma_addr_t dma_map_page(struct device *dev, struct page *page, dma_addr_t addr; BUG_ON(!valid_dma_direction(dir)); + kmemcheck_mark_initialized(page_address(page) + offset, size); addr = ops->map_page(dev, page, offset, size, dir, NULL); debug_dma_map_page(dev, page, offset, size, dir, addr, false); -- 2.7.4