Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/fs/fs_pin.c b/fs/fs_pin.c
index a6497cf..47ef3c7 100644
--- a/fs/fs_pin.c
+++ b/fs/fs_pin.c
@@ -19,18 +19,12 @@
 	spin_unlock_irq(&pin->wait.lock);
 }
 
-void pin_insert_group(struct fs_pin *pin, struct vfsmount *m, struct hlist_head *p)
-{
-	spin_lock(&pin_lock);
-	if (p)
-		hlist_add_head(&pin->s_list, p);
-	hlist_add_head(&pin->m_list, &real_mount(m)->mnt_pins);
-	spin_unlock(&pin_lock);
-}
-
 void pin_insert(struct fs_pin *pin, struct vfsmount *m)
 {
-	pin_insert_group(pin, m, &m->mnt_sb->s_pins);
+	spin_lock(&pin_lock);
+	hlist_add_head(&pin->s_list, &m->mnt_sb->s_pins);
+	hlist_add_head(&pin->m_list, &real_mount(m)->mnt_pins);
+	spin_unlock(&pin_lock);
 }
 
 void pin_kill(struct fs_pin *p)