[PATCH 4/6] VM: Annotate pagealloc

[Steve VanDeBogart]

Valgrind annotations for valgrind: memory is addressable once it's been
alloced, and unaddressable when it is freed again.  Can't use malloc-like
and free-like because valgrind considers a malloc-like chunk indivisible.

Signed-off-by: Steve VanDeBogart <vandebo-lkml@xxxxxxxxxxx>
---

Index: linux-2.6.27-rc5/mm/page_alloc.c
===================================================================
--- linux-2.6.27-rc5.orig/mm/page_alloc.c	2008-08-29 14:24:27.000000000 -0700
+++ linux-2.6.27-rc5/mm/page_alloc.c	2008-08-29 14:24:37.000000000 -0700
@@ -46,6 +46,7 @@
 #include <linux/page-isolation.h>
 #include <linux/memcontrol.h>
 #include <linux/debugobjects.h>
+#include <linux/memcheck.h>

 #include <asm/tlbflush.h>
 #include <asm/div64.h>
@@ -1080,6 +1081,7 @@
 		if (!page)
 			goto failed;
 	}
+	VALGRIND_MAKE_MEM_UNDEFINED(page_address(page), PAGE_SIZE << order);

 	__count_zone_vm_events(PGALLOC, zone, 1 << order);
 	zone_statistics(preferred_zone, zone);
@@ -1679,6 +1681,8 @@
 void __free_pages(struct page *page, unsigned int order)
 {
 	if (put_page_testzero(page)) {
+		VALGRIND_MAKE_MEM_NOACCESS(page_address(page),
+						PAGE_SIZE << order);
 		if (order == 0)
 			free_hot_page(page);
 		else
--
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