diff --git a/include/linux/fs.h b/include/linux/fs.h
index 16421f6..f5075e0 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1369,12 +1369,25 @@
  * Candidates for mandatory locking have the setgid bit set
  * but no group execute bit -  an otherwise meaningless combination.
  */
-#define MANDATORY_LOCK(inode) \
-	(IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
+
+static inline int __mandatory_lock(struct inode *ino)
+{
+	return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
+}
+
+/*
+ * ... and these candidates should be on MS_MANDLOCK mounted fs,
+ * otherwise these will be advisory locks
+ */
+
+static inline int mandatory_lock(struct inode *ino)
+{
+	return IS_MANDLOCK(ino) && __mandatory_lock(ino);
+}
 
 static inline int locks_verify_locked(struct inode *inode)
 {
-	if (MANDATORY_LOCK(inode))
+	if (mandatory_lock(inode))
 		return locks_mandatory_locked(inode);
 	return 0;
 }
@@ -1385,7 +1398,7 @@
 				    struct file *filp,
 				    loff_t size)
 {
-	if (inode->i_flock && MANDATORY_LOCK(inode))
+	if (inode->i_flock && mandatory_lock(inode))
 		return locks_mandatory_area(
 			FLOCK_VERIFY_WRITE, inode, filp,
 			size < inode->i_size ? size : inode->i_size,