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Message-ID: <alpine.DEB.1.00.0808291616170.15543@abydos.NerdBox.Net>
Date: Fri, 29 Aug 2008 16:16:46 -0700 (PDT)
From: Steve VanDeBogart <vandebo-lkml@...dBox.Net>
To: linux-kernel@...r.kernel.org,
user-mode-linux-devel@...ts.sourceforge.net, jiayingz@...gle.com,
dkegel@...gle.com
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@...dbox.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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