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Subject[PATCH 4/6] VM: Annotate pagealloc
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@nerdbox.net>
---
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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