Merge tag 'spdx-5.2-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull SPDX update from Greg KH:
 "Here is a series of patches that add SPDX tags to different kernel
  files, based on two different things:

   - SPDX entries are added to a bunch of files that we missed a year
     ago that do not have any license information at all.

     These were either missed because the tool saw the MODULE_LICENSE()
     tag, or some EXPORT_SYMBOL tags, and got confused and thought the
     file had a real license, or the files have been added since the
     last big sweep, or they were Makefile/Kconfig files, which we
     didn't touch last time.

   - Add GPL-2.0-only or GPL-2.0-or-later tags to files where our scan
     tools can determine the license text in the file itself. Where this
     happens, the license text is removed, in order to cut down on the
     700+ different ways we have in the kernel today, in a quest to get
     rid of all of these.

  These patches have been out for review on the linux-spdx@vger mailing
  list, and while they were created by automatic tools, they were
  hand-verified by a bunch of different people, all whom names are on
  the patches are reviewers.

  The reason for these "large" patches is if we were to continue to
  progress at the current rate of change in the kernel, adding license
  tags to individual files in different subsystems, we would be finished
  in about 10 years at the earliest.

  There will be more series of these types of patches coming over the
  next few weeks as the tools and reviewers crunch through the more
  "odd" variants of how to say "GPLv2" that developers have come up with
  over the years, combined with other fun oddities (GPL + a BSD
  disclaimer?) that are being unearthed, with the goal for the whole
  kernel to be cleaned up.

  These diffstats are not small, 3840 files are touched, over 10k lines
  removed in just 24 patches"

* tag 'spdx-5.2-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (24 commits)
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 25
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 24
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 23
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 22
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 21
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 20
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 19
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 18
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 17
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 15
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 14
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 12
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 11
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 10
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 9
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 7
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 5
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 4
  treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 3
  ...

52 files changed, 52 insertions, 2 deletions

diff --git a/lib/842/Makefile b/lib/842/Makefile
index 5d24c0baff2e36..6f7aad2692887d 100644
--- a/lib/842/Makefile
+++ b/lib/842/Makefile
@@ -1,2 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_842_COMPRESS) += 842_compress.o
 obj-$(CONFIG_842_DECOMPRESS) += 842_decompress.o
diff --git a/lib/Kconfig b/lib/Kconfig
index 8d9239a4156c65..90623a0e1942b2 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 #
 # Library configuration
 #
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index eae43952902ebf..cbdfae37989653 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 menu "Kernel hacking"
 
 menu "printk and dmesg options"
diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
index 9950b660e62d54..4fafba1a923b67 100644
--- a/lib/Kconfig.kasan
+++ b/lib/Kconfig.kasan
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 # This config refers to the generic KASAN mode.
 config HAVE_ARCH_KASAN
 	bool
diff --git a/lib/Kconfig.kgdb b/lib/Kconfig.kgdb
index ab4ff0eea776da..bbe397df04a32d 100644
--- a/lib/Kconfig.kgdb
+++ b/lib/Kconfig.kgdb
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 
 config HAVE_ARCH_KGDB
 	bool
diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
index a2ae4a8e4fa675..0e04fcb3ab3d07 100644
--- a/lib/Kconfig.ubsan
+++ b/lib/Kconfig.ubsan
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 config ARCH_HAS_UBSAN_SANITIZE_ALL
 	bool
 
diff --git a/lib/bitrev.c b/lib/bitrev.c
index 40ffda94cc5dbf..81b56e0a7f325b 100644
--- a/lib/bitrev.c
+++ b/lib/bitrev.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #ifndef CONFIG_HAVE_ARCH_BITREVERSE
 #include <linux/types.h>
 #include <linux/module.h>
diff --git a/lib/debug_locks.c b/lib/debug_locks.c
index ce51749cc145f2..a75ee30b77cb8d 100644
--- a/lib/debug_locks.c
+++ b/lib/debug_locks.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * lib/debug_locks.c
  *
diff --git a/lib/fault-inject.c b/lib/fault-inject.c
index e26aa4f65eb965..3cb21b2bf088d5 100644
--- a/lib/fault-inject.c
+++ b/lib/fault-inject.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/random.h>
diff --git a/lib/fonts/Kconfig b/lib/fonts/Kconfig
index 3ecdd5204ec540..37baa79cdd71fa 100644
--- a/lib/fonts/Kconfig
+++ b/lib/fonts/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 #
 # Font configuration
 #
diff --git a/lib/idr.c b/lib/idr.c
index cb1db9b8d3f6db..c34e256d2f01ac 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/bitmap.h>
 #include <linux/bug.h>
 #include <linux/export.h>
diff --git a/lib/interval_tree.c b/lib/interval_tree.c
index c85f6600a5f8de..593ce56ece5050 100644
--- a/lib/interval_tree.c
+++ b/lib/interval_tree.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/interval_tree.h>
 #include <linux/interval_tree_generic.h>
 #include <linux/compiler.h>
diff --git a/lib/interval_tree_test.c b/lib/interval_tree_test.c
index 75509a1511a3e0..f37f4d44faa907 100644
--- a/lib/interval_tree_test.c
+++ b/lib/interval_tree_test.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/interval_tree.h>
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index f74fa832f3aa99..f99c41d4eb545e 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/export.h>
 #include <linux/bvec.h>
 #include <linux/uio.h>
diff --git a/lib/lz4/Makefile b/lib/lz4/Makefile
index f7b113271d136d..5b42242afaa20d 100644
--- a/lib/lz4/Makefile
+++ b/lib/lz4/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 ccflags-y += -O3
 
 obj-$(CONFIG_LZ4_COMPRESS) += lz4_compress.o
diff --git a/lib/lzo/Makefile b/lib/lzo/Makefile
index f0f7d7ca2b83dd..2f58fafbbdddc0 100644
--- a/lib/lzo/Makefile
+++ b/lib/lzo/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 lzo_compress-objs := lzo1x_compress.o
 lzo_decompress-objs := lzo1x_decompress_safe.o
 
diff --git a/lib/lzo/lzo1x_compress.c b/lib/lzo/lzo1x_compress.c
index a8ede77afe0db7..ba16c08e8cb921 100644
--- a/lib/lzo/lzo1x_compress.c
+++ b/lib/lzo/lzo1x_compress.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *  LZO1X Compressor from LZO
  *
diff --git a/lib/lzo/lzo1x_decompress_safe.c b/lib/lzo/lzo1x_decompress_safe.c
index 9e07e9ef1aad7e..2717c7963acdfa 100644
--- a/lib/lzo/lzo1x_decompress_safe.c
+++ b/lib/lzo/lzo1x_decompress_safe.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *  LZO1X Decompressor from LZO
  *
diff --git a/lib/math/Kconfig b/lib/math/Kconfig
index 73bdf37178d1e9..15bd50d92308d9 100644
--- a/lib/math/Kconfig
+++ b/lib/math/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 config CORDIC
 	tristate "CORDIC algorithm"
 	help
diff --git a/lib/math/Makefile b/lib/math/Makefile
index 583bbfebfc098d..be6909e943bdd7 100644
--- a/lib/math/Makefile
+++ b/lib/math/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 obj-y += div64.o gcd.o lcm.o int_pow.o int_sqrt.o reciprocal_div.o
 
 obj-$(CONFIG_CORDIC)		+= cordic.o
diff --git a/lib/math/gcd.c b/lib/math/gcd.c
index 7948ab27f0a483..e3b042214d1b7d 100644
--- a/lib/math/gcd.c
+++ b/lib/math/gcd.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/kernel.h>
 #include <linux/gcd.h>
 #include <linux/export.h>
diff --git a/lib/math/lcm.c b/lib/math/lcm.c
index 03d7fcb420b5d6..6e0b2e7367007d 100644
--- a/lib/math/lcm.c
+++ b/lib/math/lcm.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/compiler.h>
 #include <linux/gcd.h>
 #include <linux/export.h>
diff --git a/lib/math/prime_numbers.c b/lib/math/prime_numbers.c
index 550eec457c2edb..052f5b727be7d5 100644
--- a/lib/math/prime_numbers.c
+++ b/lib/math/prime_numbers.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #define pr_fmt(fmt) "prime numbers: " fmt "\n"
 
 #include <linux/module.h>
diff --git a/lib/memory-notifier-error-inject.c b/lib/memory-notifier-error-inject.c
index e6239bf0b0dfd6..2c46dde596442e 100644
--- a/lib/memory-notifier-error-inject.c
+++ b/lib/memory-notifier-error-inject.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/memory.h>
diff --git a/lib/netdev-notifier-error-inject.c b/lib/netdev-notifier-error-inject.c
index 13e9c62e216ff0..bb930f279e9072 100644
--- a/lib/netdev-notifier-error-inject.c
+++ b/lib/netdev-notifier-error-inject.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
diff --git a/lib/notifier-error-inject.c b/lib/notifier-error-inject.c
index eb4a04afea80a6..3d2ba7cf83f458 100644
--- a/lib/notifier-error-inject.c
+++ b/lib/notifier-error-inject.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/module.h>
 
 #include "notifier-error-inject.h"
diff --git a/lib/of-reconfig-notifier-error-inject.c b/lib/of-reconfig-notifier-error-inject.c
index 8dc79861758a17..b26f16402a19fe 100644
--- a/lib/of-reconfig-notifier-error-inject.c
+++ b/lib/of-reconfig-notifier-error-inject.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
diff --git a/lib/percpu-refcount.c b/lib/percpu-refcount.c
index da54318d3b5561..071a76c7bac079 100644
--- a/lib/percpu-refcount.c
+++ b/lib/percpu-refcount.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #define pr_fmt(fmt) "%s: " fmt "\n", __func__
 
 #include <linux/kernel.h>
diff --git a/lib/percpu_test.c b/lib/percpu_test.c
index 0b5d14dadd1a3f..4a3d70bbc1a082 100644
--- a/lib/percpu_test.c
+++ b/lib/percpu_test.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/module.h>
 
 /* validate @native and @pcp counter values match @expected */
diff --git a/lib/plist.c b/lib/plist.c
index d3bd8827186fe5..0d86ed7a76ac62 100644
--- a/lib/plist.c
+++ b/lib/plist.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * lib/plist.c
  *
@@ -14,8 +15,6 @@
  * Simplifications of the original code by
  * Oleg Nesterov <oleg@tv-sign.ru>
  *
- * Licensed under the FSF's GNU Public License v2 or later.
- *
  * Based on simple lists (include/linux/list.h).
  *
  * This file contains the add / del functions which are considered to
diff --git a/lib/pm-notifier-error-inject.c b/lib/pm-notifier-error-inject.c
index c094b2dedc231c..5d89f0d9099aa3 100644
--- a/lib/pm-notifier-error-inject.c
+++ b/lib/pm-notifier-error-inject.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/suspend.h>
diff --git a/lib/rbtree_test.c b/lib/rbtree_test.c
index b7055b2a07d37a..62b8ee92643dc5 100644
--- a/lib/rbtree_test.c
+++ b/lib/rbtree_test.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/rbtree_augmented.h>
diff --git a/lib/reed_solomon/Makefile b/lib/reed_solomon/Makefile
index c3d7136827edd9..ba9d7a3329eb41 100644
--- a/lib/reed_solomon/Makefile
+++ b/lib/reed_solomon/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 #
 # This is a modified version of reed solomon lib,
 #
diff --git a/lib/sg_pool.c b/lib/sg_pool.c
index d1c1e6388eaa73..cff20df2695e20 100644
--- a/lib/sg_pool.c
+++ b/lib/sg_pool.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/module.h>
 #include <linux/scatterlist.h>
 #include <linux/mempool.h>
diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index 29c490e5d47858..4403e1924f7307 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Helpers for formatting and printing strings
  *
diff --git a/lib/test_bitmap.c b/lib/test_bitmap.c
index d3a501f2a81ac7..51a98f7ee79e62 100644
--- a/lib/test_bitmap.c
+++ b/lib/test_bitmap.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Test cases for printf facility.
  */
diff --git a/lib/test_debug_virtual.c b/lib/test_debug_virtual.c
index bf864c73e462a7..b7cc0aaee17346 100644
--- a/lib/test_debug_virtual.c
+++ b/lib/test_debug_virtual.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/export.h>
diff --git a/lib/test_firmware.c b/lib/test_firmware.c
index 7222093ee00bee..787c146eb48505 100644
--- a/lib/test_firmware.c
+++ b/lib/test_firmware.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * This module provides an interface to trigger and test firmware loading.
  *
diff --git a/lib/test_hash.c b/lib/test_hash.c
index cac20c5fb304fb..0ee40b4a56ddaf 100644
--- a/lib/test_hash.c
+++ b/lib/test_hash.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Test cases for <linux/hash.h> and <linux/stringhash.h>
  * This just verifies that various ways of computing a hash
diff --git a/lib/test_list_sort.c b/lib/test_list_sort.c
index 5474f3f3e41d07..1f017d3b610ee3 100644
--- a/lib/test_list_sort.c
+++ b/lib/test_list_sort.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #define pr_fmt(fmt) "list_sort_test: " fmt
 
 #include <linux/kernel.h>
diff --git a/lib/test_module.c b/lib/test_module.c
index 319b66f1ff61ec..debd19e351989b 100644
--- a/lib/test_module.c
+++ b/lib/test_module.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * This module emits "Hello, world" on printk when loaded.
  *
diff --git a/lib/test_printf.c b/lib/test_printf.c
index 93da0a5000ec8d..944eb50f386253 100644
--- a/lib/test_printf.c
+++ b/lib/test_printf.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Test cases for printf facility.
  */
diff --git a/lib/test_sort.c b/lib/test_sort.c
index 385c0ed5202ffb..52edbe10f2e513 100644
--- a/lib/test_sort.c
+++ b/lib/test_sort.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/sort.h>
 #include <linux/slab.h>
 #include <linux/module.h>
diff --git a/lib/test_string.c b/lib/test_string.c
index 0fcdb82dca8667..bf8def01ed2045 100644
--- a/lib/test_string.c
+++ b/lib/test_string.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/module.h>
 #include <linux/printk.h>
 #include <linux/slab.h>
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 2f003cfe340ec5..63937044c57d55 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *  linux/lib/vsprintf.c
  *
diff --git a/lib/xz/Kconfig b/lib/xz/Kconfig
index 12d2d777f36b64..22528743d4cecf 100644
--- a/lib/xz/Kconfig
+++ b/lib/xz/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 config XZ_DEC
 	tristate "XZ decompression support"
 	select CRC32
diff --git a/lib/xz/Makefile b/lib/xz/Makefile
index a7fa7693f0f343..fa6af814a8d157 100644
--- a/lib/xz/Makefile
+++ b/lib/xz/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_XZ_DEC) += xz_dec.o
 xz_dec-y := xz_dec_syms.o xz_dec_stream.o xz_dec_lzma2.o
 xz_dec-$(CONFIG_XZ_DEC_BCJ) += xz_dec_bcj.o
diff --git a/lib/zlib_deflate/Makefile b/lib/zlib_deflate/Makefile
index 86275e3fdcbcbb..2622e03c0b942f 100644
--- a/lib/zlib_deflate/Makefile
+++ b/lib/zlib_deflate/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 #
 # This is a modified version of zlib, which does all memory
 # allocation ahead of time.
diff --git a/lib/zlib_deflate/deflate_syms.c b/lib/zlib_deflate/deflate_syms.c
index ccfe25f3920f59..72fe4b73be5394 100644
--- a/lib/zlib_deflate/deflate_syms.c
+++ b/lib/zlib_deflate/deflate_syms.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * linux/lib/zlib_deflate/deflate_syms.c
  *
diff --git a/lib/zlib_inflate/Makefile b/lib/zlib_inflate/Makefile
index 49f8ce5774d289..27327d3e9f5410 100644
--- a/lib/zlib_inflate/Makefile
+++ b/lib/zlib_inflate/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 #
 # This is a modified version of zlib, which does all memory
 # allocation ahead of time.
diff --git a/lib/zlib_inflate/inflate_syms.c b/lib/zlib_inflate/inflate_syms.c
index 67329fe9907e5c..9720114c067210 100644
--- a/lib/zlib_inflate/inflate_syms.c
+++ b/lib/zlib_inflate/inflate_syms.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * linux/lib/zlib_inflate/inflate_syms.c
  *
diff --git a/lib/zstd/Makefile b/lib/zstd/Makefile
index 7920cbbfeae9fa..f5d778e7e5c72d 100644
--- a/lib/zstd/Makefile
+++ b/lib/zstd/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_ZSTD_COMPRESS) += zstd_compress.o
 obj-$(CONFIG_ZSTD_DECOMPRESS) += zstd_decompress.o