From a9861183f49769c70f7e635eb6e2601d0d5cbdb5 Mon Sep 17 00:00:00 2001
From: Carsten Otte <carsteno@de.ibm.com>
Date: Fri, 3 Feb 2012 15:37:14 -0800
Subject: [PATCH] --- yaml --- r: 287214 b: refs/heads/master c:
 99f02ef1f18631eb0a4e0ea0a3d56878dbcb4b90 h: refs/heads/master v: v3

---
 [refs]                 | 2 +-
 trunk/mm/filemap_xip.c | 7 ++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/[refs] b/[refs]
index 68685f282489..049fd35f6141 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 82b3f2a7171731cce62f25058d25afb91a14710c
+refs/heads/master: 99f02ef1f18631eb0a4e0ea0a3d56878dbcb4b90
diff --git a/trunk/mm/filemap_xip.c b/trunk/mm/filemap_xip.c
index f91b2f687343..a4eb31132229 100644
--- a/trunk/mm/filemap_xip.c
+++ b/trunk/mm/filemap_xip.c
@@ -263,7 +263,12 @@ static int xip_file_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 							xip_pfn);
 		if (err == -ENOMEM)
 			return VM_FAULT_OOM;
-		BUG_ON(err);
+		/*
+		 * err == -EBUSY is fine, we've raced against another thread
+		 * that faulted-in the same page
+		 */
+		if (err != -EBUSY)
+			BUG_ON(err);
 		return VM_FAULT_NOPAGE;
 	} else {
 		int err, ret = VM_FAULT_OOM;