linux-kernel - [PATCH 4/6] VM: Annotate pagealloc

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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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