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kmemcheck: add DMA hooks

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This patch hooks into the DMA API to prevent the reporting of the
false positives that would otherwise be reported when memory is
accessed that is also used directly by devices.

[rebased for mainline inclusion]
Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
This commit is contained in:
Vegard Nossum 2008-07-20 10:44:54 +02:00
parent 2dff440525
commit d7002857de
2 changed files with 18 additions and 0 deletions
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2
arch/x86/include/asm/dma-mapping.h
View file

@ -6,6 +6,7 @@
* Documentation/DMA-API.txt for documentation.
*/
#include <linux/kmemcheck.h>
#include <linux/scatterlist.h>
#include <linux/dma-debug.h>
#include <linux/dma-attrs.h>
@ -60,6 +61,7 @@ dma_map_single(struct device *hwdev, void *ptr, size_t size,
dma_addr_t addr;
BUG_ON(!valid_dma_direction(dir));
kmemcheck_mark_initialized(ptr, size);
addr = ops->map_page(hwdev, virt_to_page(ptr),
(unsigned long)ptr & ~PAGE_MASK, size,
dir, NULL);

16
include/linux/kmemcheck.h
View file

@ -59,6 +59,22 @@ static inline bool kmemcheck_page_is_tracked(struct page *p)
{
return false;
}
static inline void kmemcheck_mark_unallocated(void *address, unsigned int n)
{
}
static inline void kmemcheck_mark_uninitialized(void *address, unsigned int n)
{
}
static inline void kmemcheck_mark_initialized(void *address, unsigned int n)
{
}
static inline void kmemcheck_mark_freed(void *address, unsigned int n)
{
}
#endif /* CONFIG_KMEMCHECK */
#endif /* LINUX_KMEMCHECK_H */