From 8d4f7c5ab95d072658af8459a3d411c6cb9d51ac Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@redhat.com>
Date: Fri, 15 Jun 2012 17:43:36 +0200
Subject: [PATCH] --- yaml --- r: 312232 b: refs/heads/master c:
 7a5bfb66b07f22d2429db776da7bb8b57bfb5cff h: refs/heads/master v: v3

---
 [refs]                        |  2 +-
 trunk/kernel/events/uprobes.c | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index a4e4a5b30535..f01cdd9e5800 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 268720903f87e0b84b161626c4447b81671b5d18
+refs/heads/master: 7a5bfb66b07f22d2429db776da7bb8b57bfb5cff
diff --git a/trunk/kernel/events/uprobes.c b/trunk/kernel/events/uprobes.c
index 4e0db3496d70..897417dbca8e 100644
--- a/trunk/kernel/events/uprobes.c
+++ b/trunk/kernel/events/uprobes.c
@@ -761,6 +761,16 @@ build_map_info(struct address_space *mapping, loff_t offset, bool is_register)
 		if (!valid_vma(vma, is_register))
 			continue;
 
+		if (!prev && !more) {
+			/*
+			 * Needs GFP_NOWAIT to avoid i_mmap_mutex recursion through
+			 * reclaim. This is optimistic, no harm done if it fails.
+			 */
+			prev = kmalloc(sizeof(struct map_info),
+					GFP_NOWAIT | __GFP_NOMEMALLOC | __GFP_NOWARN);
+			if (prev)
+				prev->next = NULL;
+		}
 		if (!prev) {
 			more++;
 			continue;