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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 <[email protected]>
Acked-by: Pekka Enberg <[email protected]>

[build fix for !CONFIG_KMEMCHECK]
Signed-off-by: Ingo Molnar <[email protected]>

[rebased for mainline inclusion]
Signed-off-by: Vegard Nossum <[email protected]>
This commit is contained in:
Vegard Nossum 2008-11-25 16:55:53 +01:00
commit b1eeab6768
8 changed files with 122 additions and 31 deletions
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15
mm/slab.c
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@ -1612,7 +1612,7 @@ static void *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid)
if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
flags |= __GFP_RECLAIMABLE;
page = alloc_pages_node(nodeid, flags, cachep->gfporder);
page = alloc_pages_node(nodeid, flags | __GFP_NOTRACK, cachep->gfporder);
if (!page)
return NULL;
@ -1626,8 +1626,14 @@ static void *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid)
for (i = 0; i < nr_pages; i++)
__SetPageSlab(page + i);
if (kmemcheck_enabled && !(cachep->flags & SLAB_NOTRACK))
kmemcheck_alloc_shadow(cachep, flags, nodeid, page, cachep->gfporder);
if (kmemcheck_enabled && !(cachep->flags & SLAB_NOTRACK)) {
kmemcheck_alloc_shadow(page, cachep->gfporder, flags, nodeid);
if (cachep->ctor)
kmemcheck_mark_uninitialized_pages(page, nr_pages);
else
kmemcheck_mark_unallocated_pages(page, nr_pages);
}
return page_address(page);
}
@ -1641,8 +1647,7 @@ static void kmem_freepages(struct kmem_cache *cachep, void *addr)
struct page *page = virt_to_page(addr);
const unsigned long nr_freed = i;
if (kmemcheck_page_is_tracked(page))
kmemcheck_free_shadow(cachep, page, cachep->gfporder);
kmemcheck_free_shadow(page, cachep->gfporder);
if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
sub_zone_page_state(page_zone(page),