From 87d81fba0abf358b4bd2eec61a84cc389ec844ff Mon Sep 17 00:00:00 2001
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Wed, 28 Jul 2010 15:25:10 +1000
Subject: [PATCH] --- yaml --- r: 212715 b: refs/heads/master c:
 25818f0f288cd5333ba5a90ad6dde3def4c4ff58 h: refs/heads/master i:   212713:
 481ba6dac1adee2b51df1a0ca91be0efa4d87e54   212711:
 956b46a1f2fdbe4ac8ae1510999055ee887209d8 v: v3

---
 [refs]                         | 2 +-
 trunk/include/linux/memblock.h | 2 +-
 trunk/mm/memblock.c            | 6 ++++++
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/[refs] b/[refs]
index 18fbb48774d6..cbea7a6128a3 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 37d8d4bf489e39eedc9537f8616fe87879b13cb0
+refs/heads/master: 25818f0f288cd5333ba5a90ad6dde3def4c4ff58
diff --git a/trunk/include/linux/memblock.h b/trunk/include/linux/memblock.h
index 1a9c29cc92fa..dfa64494ced1 100644
--- a/trunk/include/linux/memblock.h
+++ b/trunk/include/linux/memblock.h
@@ -19,7 +19,7 @@
 #include <asm/memblock.h>
 
 #define INIT_MEMBLOCK_REGIONS	128
-#define MEMBLOCK_ERROR		(~(phys_addr_t)0)
+#define MEMBLOCK_ERROR		0
 
 struct memblock_region {
 	phys_addr_t base;
diff --git a/trunk/mm/memblock.c b/trunk/mm/memblock.c
index 85cfa1d3ab28..cb520df2a414 100644
--- a/trunk/mm/memblock.c
+++ b/trunk/mm/memblock.c
@@ -105,6 +105,12 @@ static phys_addr_t __init memblock_find_region(phys_addr_t start, phys_addr_t en
 	phys_addr_t base, res_base;
 	long j;
 
+	/* Prevent allocations returning 0 as it's also used to
+	 * indicate an allocation failure
+	 */
+	if (start == 0)
+		start = PAGE_SIZE;
+
 	base = memblock_align_down((end - size), align);
 	while (start <= base) {
 		j = memblock_overlaps_region(&memblock.reserved, base, size);