treewide: Add SPDX license identifier for missed files

Add SPDX license identifiers to all files which:

 - Have no license information of any form

 - Have EXPORT_.*_SYMBOL_GPL inside which was used in the
   initial scan/conversion to ignore the file

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

  GPL-2.0-only

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 72e6d0c..909dae4 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 
 #include <linux/wait.h>
 #include <linux/backing-dev.h>
diff --git a/mm/balloon_compaction.c b/mm/balloon_compaction.c
index ef858d5..ba739b7 100644
--- a/mm/balloon_compaction.c
+++ b/mm/balloon_compaction.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * mm/balloon_compaction.c
  *
diff --git a/mm/filemap.c b/mm/filemap.c
index c5af80c..df2006b 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *	linux/mm/filemap.c
  *
diff --git a/mm/gup.c b/mm/gup.c
index 2c08248..f173fcb 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/err.h>
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 81718c5..ac843d3 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Generic hugetlb support.
  * (C) Nadia Yvette Chambers, April 2004
diff --git a/mm/list_lru.c b/mm/list_lru.c
index 0730bf8..0bdf315 100644
--- a/mm/list_lru.c
+++ b/mm/list_lru.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2013 Red Hat, Inc. and Parallels Inc. All rights reserved.
  * Authors: David Chinner and Glauber Costa
diff --git a/mm/maccess.c b/mm/maccess.c
index ec00be5..482d4d6 100644
--- a/mm/maccess.c
+++ b/mm/maccess.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Access kernel memory without faulting.
  */
diff --git a/mm/memory.c b/mm/memory.c
index 96f1d47..ddf20bd 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *  linux/mm/memory.c
  *
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 328878b..e096c98 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *  linux/mm/memory_hotplug.c
  *
diff --git a/mm/mm_init.c b/mm/mm_init.c
index 3391710..5c91838 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * mm_init.c - Memory initialisation verification and debugging
  *
diff --git a/mm/mmap.c b/mm/mmap.c
index 2d6a666..7e8c3e8a 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * mm/mmap.c
  *
diff --git a/mm/nommu.c b/mm/nommu.c
index b492fd1..d8c02fb 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *  linux/mm/nommu.c
  *
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 539c91d..5a58778 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *  linux/mm/oom_kill.c
  * 
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 0765648..bdbe8b6 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * mm/page-writeback.c
  *
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3b13d39..d66bc8a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *  linux/mm/page_alloc.c
  *
diff --git a/mm/readahead.c b/mm/readahead.c
index a459365..2fe72cd 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * mm/readahead.c - address_space-level file readahead.
  *
diff --git a/mm/swap.c b/mm/swap.c
index 3a75722..7ede3ed 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *  linux/mm/swap.c
  *
diff --git a/mm/swapfile.c b/mm/swapfile.c
index cf63b5f..596ac98 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *  linux/mm/swapfile.c
  *
diff --git a/mm/truncate.c b/mm/truncate.c
index b7d3c99..85633390 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * mm/truncate.c - code for taking down pages from address_spaces
  *
diff --git a/mm/util.c b/mm/util.c
index e2e4f8c..91682a2 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/string.h>
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index c42872e..233af69 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *  linux/mm/vmalloc.c
  *
diff --git a/mm/vmstat.c b/mm/vmstat.c
index a7d4933..fd7e16c 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *  linux/mm/vmstat.c
  *