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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
2008-11-25 16:55:53 +01:00
parent 9b5cab3189
commit b1eeab6768
8 changed files with 122 additions and 31 deletions
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23
mm/slub.c
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@@ -1066,6 +1066,8 @@ static inline struct page *alloc_slab_page(gfp_t flags, int node,
{
int order = oo_order(oo);
flags |= __GFP_NOTRACK;
if (node == -1)
return alloc_pages(flags, order);
else
@@ -1097,7 +1099,18 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
if (kmemcheck_enabled
&& !(s->flags & (SLAB_NOTRACK | DEBUG_DEFAULT_FLAGS)))
{
kmemcheck_alloc_shadow(s, flags, node, page, compound_order(page));
int pages = 1 << oo_order(oo);
kmemcheck_alloc_shadow(page, oo_order(oo), flags, node);
/*
* Objects from caches that have a constructor don't get
* cleared when they're allocated, so we need to do it here.
*/
if (s->ctor)
kmemcheck_mark_uninitialized_pages(page, pages);
else
kmemcheck_mark_unallocated_pages(page, pages);
}
page->objects = oo_objects(oo);
@@ -1173,8 +1186,7 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
__ClearPageSlubDebug(page);
}
if (kmemcheck_page_is_tracked(page))
kmemcheck_free_shadow(s, page, compound_order(page));
kmemcheck_free_shadow(page, compound_order(page));
mod_zone_page_state(page_zone(page),
(s->flags & SLAB_RECLAIM_ACCOUNT) ?
@@ -2734,9 +2746,10 @@ EXPORT_SYMBOL(__kmalloc);
static void *kmalloc_large_node(size_t size, gfp_t flags, int node)
{
struct page *page = alloc_pages_node(node, flags | __GFP_COMP,
get_order(size));
struct page *page;
flags |= __GFP_COMP | __GFP_NOTRACK;
page = alloc_pages_node(node, flags, get_order(size));
if (page)
return page_address(page);
else