2 files changed, 15 insertions, 5 deletions

diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index 5104cf5d25c5..bd6e18be6e1a 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -187,19 +187,23 @@ static void kernfs_deactivate(struct kernfs_node *kn)
 
         kn->u.completion = (void *)&wait;
 
-        rwsem_acquire(&kn->dep_map, 0, 0, _RET_IP_);
+        if (kn->flags & KERNFS_LOCKDEP)
+                rwsem_acquire(&kn->dep_map, 0, 0, _RET_IP_);
         /* atomic_add_return() is a mb(), put_active() will always see
          * the updated kn->u.completion.
          */
         v = atomic_add_return(KN_DEACTIVATED_BIAS, &kn->active);
 
         if (v != KN_DEACTIVATED_BIAS) {
-                lock_contended(&kn->dep_map, _RET_IP_);
+                if (kn->flags & KERNFS_LOCKDEP)
+                        lock_contended(&kn->dep_map, _RET_IP_);
                 wait_for_completion(&wait);
         }
 
-        lock_acquired(&kn->dep_map, _RET_IP_);
-        rwsem_release(&kn->dep_map, 1, _RET_IP_);
+        if (kn->flags & KERNFS_LOCKDEP) {
+                lock_acquired(&kn->dep_map, _RET_IP_);
+                rwsem_release(&kn->dep_map, 1, _RET_IP_);
+        }
 }
 
 /**
diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index 0d6ce895a9ee..0f4152defe7b 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -94,6 +94,7 @@ const void *kernfs_super_ns(struct super_block *sb)
  * @fs_type: file_system_type of the fs being mounted
  * @flags: mount flags specified for the mount
  * @root: kernfs_root of the hierarchy being mounted
+ * @new_sb_created: tell the caller if we allocated a new superblock
  * @ns: optional namespace tag of the mount
  *
  * This is to be called from each kernfs user's file_system_type->mount()
@@ -104,7 +105,8 @@ const void *kernfs_super_ns(struct super_block *sb)
  * The return value can be passed to the vfs layer verbatim.
  */
 struct dentry *kernfs_mount_ns(struct file_system_type *fs_type, int flags,
-                               struct kernfs_root *root, const void *ns)
+                               struct kernfs_root *root, bool *new_sb_created,
+                               const void *ns)
 {
         struct super_block *sb;
         struct kernfs_super_info *info;
@@ -122,6 +124,10 @@ struct dentry *kernfs_mount_ns(struct file_system_type *fs_type, int flags,
                 kfree(info);
         if (IS_ERR(sb))
                 return ERR_CAST(sb);
+
+        if (new_sb_created)
+                *new_sb_created = !sb->s_root;
+
         if (!sb->s_root) {
                 error = kernfs_fill_super(sb);
                 if (error) {