diff --git a/[refs] b/[refs]
index edf894d9da07..f2cad966b61c 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 515432aa7ae75ea493099f38adc14a99436fa1ac
+refs/heads/master: fbbde0c30943306ddb77d969df6be68ebc6dc265
diff --git a/trunk/fs/nfs/file.c b/trunk/fs/nfs/file.c
index eb5cd4c3bbfd..7a79fbe9f539 100644
--- a/trunk/fs/nfs/file.c
+++ b/trunk/fs/nfs/file.c
@@ -509,7 +509,8 @@ static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
 		return -EINVAL;
 
 	/* No mandatory locks over NFS */
-	if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
+	if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID &&
+	    fl->fl_type != F_UNLCK)
 		return -ENOLCK;
 
 	if (IS_GETLK(cmd))
diff --git a/trunk/include/linux/preempt.h b/trunk/include/linux/preempt.h
index d9a2f5254a51..5769d14d1e6a 100644
--- a/trunk/include/linux/preempt.h
+++ b/trunk/include/linux/preempt.h
@@ -48,6 +48,7 @@ do { \
 #define preempt_enable() \
 do { \
 	preempt_enable_no_resched(); \
+	barrier(); \
 	preempt_check_resched(); \
 } while (0)