From 1ca7d9eac6864c606a49b00b0f767d955807fdc0 Mon Sep 17 00:00:00 2001
From: Dave Jones <davej@redhat.com>
Date: Fri, 4 Apr 2014 20:32:08 -0400
Subject: [PATCH] add routine to fault in whole mapping in reverse

---
 maps-fault.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/maps-fault.c b/maps-fault.c
index 0a3eb67..cf4043c 100644
--- a/maps-fault.c
+++ b/maps-fault.c
@@ -108,6 +108,17 @@ static void read_every_other_page(struct map *map)
 		memcpy(buf, p + i, page_size);
 }
 
+static void read_mapping_reverse(struct map *map)
+{
+	char *p = map->ptr;
+	unsigned int i;
+	char buf[page_size];
+
+	for (i = (map->size - page_size); i > 0; i -= page_size)
+		memcpy(buf, p + i, page_size);
+}
+
+
 /*****************************************************************************/
 
 static const struct faultfn write_faultfns[] = {
@@ -123,6 +134,7 @@ static const struct faultfn read_faultfns[] = {
 	{ .func = read_one_page },
 	{ .func = read_whole_mapping },
 	{ .func = read_every_other_page },
+	{ .func = read_mapping_reverse },
 };
 
 /*
-- 
2.11.4.GIT