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authorVegard Nossum <vegard.nossum@gmail.com>2008-11-25 16:55:53 +0100
committerVegard Nossum <vegard.nossum@gmail.com>2009-06-15 15:48:33 +0200
commitb1eeab67682a5e397aecf172046b3a8bd4808ae4 (patch)
treec357b6ac1945dc8beecc2f8c4d84660ad8d35aae /mm/slab.c
parent9b5cab31897e9e89e36c0c2a89b16b93ff1a971a (diff)
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kmemcheck: add hooks for the page allocator
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>
Diffstat (limited to 'mm/slab.c')
-rw-r--r--mm/slab.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/mm/slab.c b/mm/slab.c
index 95b6c5eb40b..6a1ad0b9a94 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -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),