commit b1eeab67682a5e397aecf172046b3a8bd4808ae4
author Vegard Nossum <vegard.nossum@gmail.com> Tue Nov 25 16:55:53 2008 +0100
committer Vegard Nossum <vegard.nossum@gmail.com> Mon Jun 15 15:48:33 2009 +0200
tree c357b6ac1945dc8beecc2f8c4d84660ad8d35aae
parent 9b5cab31897e9e89e36c0c2a89b16b93ff1a971a

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>

mm/slab.c

diff --git a/mm/slab.c b/mm/slab.c
index 95b6c5e..6a1ad0b 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1612,7 +1612,7 @@
 	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 @@
 	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 @@
 	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),