linux-kernel - [PATCH] kmemcheck: add hooks for page- and sg-dma-mappings

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Date:	Sat, 21 Feb 2009 14:36:03 +0100
From:	Vegard Nossum <vegard.nossum@...il.com>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:	Ingo Molnar <mingo@...e.hu>, Pekka Enberg <penberg@...helsinki.fi>
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.

Signed-off-by: Vegard Nossum <vegard.nossum@...il.com>
---
 arch/x86/include/asm/dma-mapping.h |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index 830bb0e..713a002 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -117,7 +117,12 @@ dma_map_sg(struct device *hwdev, struct scatterlist *sg,
 {
 	struct dma_mapping_ops *ops = get_dma_ops(hwdev);
 
+	struct scatterlist *s;
+	int i;
+
 	BUG_ON(!valid_dma_direction(direction));
+	for_each_sg(sg, s, nents, i)
+		kmemcheck_mark_initialized(sg_virt(s), s->length);
 	return ops->map_sg(hwdev, sg, nents, direction);
 }
 
@@ -215,6 +220,7 @@ static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 	struct dma_mapping_ops *ops = get_dma_ops(dev);
 
 	BUG_ON(!valid_dma_direction(direction));
+	kmemcheck_mark_initialized(page_address(page) + offset, size);
 	return ops->map_single(dev, page_to_phys(page) + offset,
 			       size, direction);
 }
-- 
1.6.0.6

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