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>
diff --git a/mm/slub.c b/mm/slub.c
index 1cebaa7..898fb50 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1066,6 +1066,8 @@
{
int order = oo_order(oo);
+ flags |= __GFP_NOTRACK;
+
if (node == -1)
return alloc_pages(flags, order);
else
@@ -1097,7 +1099,18 @@
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 @@
__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 @@
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
