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kmemcheck: add hooks for the page allocator

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This adds support for tracking the initializedness of memory that
was allocated with the page allocator. Highmem requests are not
tracked.

Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>

[build fix for !CONFIG_KMEMCHECK]
Signed-off-by: Ingo Molnar <mingo@elte.hu>

[rebased for mainline inclusion]
Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
This commit is contained in:
Vegard Nossum
2009-06-15 15:48:33 +02:00
parent 9b5cab3189
commit b1eeab6768
8 changed files with 122 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/linux/gfp.h
+5
View File
@@ -51,7 +51,12 @@ struct vm_area_struct;
#define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */
#define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */
#define __GFP_MOVABLE ((__force gfp_t)0x100000u) /* Page is movable */
#ifdef CONFIG_KMEMCHECK
#define __GFP_NOTRACK ((__force gfp_t)0x200000u) /* Don't track with kmemcheck */
#else
#define __GFP_NOTRACK ((__force gfp_t)0)
#endif
/*
* This may seem redundant, but it's a way of annotating false positives vs.
include/linux/kmemcheck.h
+29 -6
View File
@@ -8,13 +8,15 @@
extern int kmemcheck_enabled;
/* The slab-related functions. */
void kmemcheck_alloc_shadow(struct kmem_cache *s, gfp_t flags, int node,
struct page *page, int order);
void kmemcheck_free_shadow(struct kmem_cache *s, struct page *page, int order);
void kmemcheck_alloc_shadow(struct page *page, int order, gfp_t flags, int node);
void kmemcheck_free_shadow(struct page *page, int order);
void kmemcheck_slab_alloc(struct kmem_cache *s, gfp_t gfpflags, void *object,
size_t size);
void kmemcheck_slab_free(struct kmem_cache *s, void *object, size_t size);
void kmemcheck_pagealloc_alloc(struct page *p, unsigned int order,
gfp_t gfpflags);
void kmemcheck_show_pages(struct page *p, unsigned int n);
void kmemcheck_hide_pages(struct page *p, unsigned int n);
@@ -27,6 +29,7 @@ void kmemcheck_mark_freed(void *address, unsigned int n);
void kmemcheck_mark_unallocated_pages(struct page *p, unsigned int n);
void kmemcheck_mark_uninitialized_pages(struct page *p, unsigned int n);
void kmemcheck_mark_initialized_pages(struct page *p, unsigned int n);
int kmemcheck_show_addr(unsigned long address);
int kmemcheck_hide_addr(unsigned long address);
@@ -34,13 +37,12 @@ int kmemcheck_hide_addr(unsigned long address);
#define kmemcheck_enabled 0
static inline void
kmemcheck_alloc_shadow(struct kmem_cache *s, gfp_t flags, int node,
struct page *page, int order)
kmemcheck_alloc_shadow(struct page *page, int order, gfp_t flags, int node)
{
}
static inline void
kmemcheck_free_shadow(struct kmem_cache *s, struct page *page, int order)
kmemcheck_free_shadow(struct page *page, int order)
{
}
@@ -55,6 +57,11 @@ static inline void kmemcheck_slab_free(struct kmem_cache *s, void *object,
{
}
static inline void kmemcheck_pagealloc_alloc(struct page *p,
unsigned int order, gfp_t gfpflags)
{
}
static inline bool kmemcheck_page_is_tracked(struct page *p)
{
return false;
@@ -75,6 +82,22 @@ static inline void kmemcheck_mark_initialized(void *address, unsigned int n)
static inline void kmemcheck_mark_freed(void *address, unsigned int n)
{
}
static inline void kmemcheck_mark_unallocated_pages(struct page *p,
unsigned int n)
{
}
static inline void kmemcheck_mark_uninitialized_pages(struct page *p,
unsigned int n)
{
}
static inline void kmemcheck_mark_initialized_pages(struct page *p,
unsigned int n)
{
}
#endif /* CONFIG_KMEMCHECK */
#endif /* LINUX_KMEMCHECK_H */