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Commit d7002857 authored by Vegard Nossum's avatar Vegard Nossum
Browse files

kmemcheck: add DMA hooks 



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: default avatarVegard Nossum <vegard.nossum@gmail.com>
parent 2dff4405

arch/x86/include/asm/dma-mapping.h

+2 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/kmemcheck.h

+16 −0
Original line number Diff line number Diff line
@@ -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 */