diff --git a/include/abort.h b/include/abort.h
index 89ee549..039500b 100644
--- a/include/abort.h
+++ b/include/abort.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __ABORT_H
 #define __ABORT_H
 
diff --git a/include/bbu.h b/include/bbu.h
index 9da6785..3b9d2f4 100644
--- a/include/bbu.h
+++ b/include/bbu.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __INCLUDE_BBU_H
 #define __INCLUDE_BBU_H
 
diff --git a/include/block.h b/include/block.h
index 9137767..bd87efd 100644
--- a/include/block.h
+++ b/include/block.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __BLOCK_H
 #define __BLOCK_H
 
diff --git a/include/blspec.h b/include/blspec.h
index 7d911f0..37076cd 100644
--- a/include/blspec.h
+++ b/include/blspec.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __LOADER_H__
 #define __LOADER_H__
 
diff --git a/include/boot.h b/include/boot.h
index 4f7612a..4054c27 100644
--- a/include/boot.h
+++ b/include/boot.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __BOOT_H
 #define __BOOT_H
 
diff --git a/include/bootchooser.h b/include/bootchooser.h
index 7822c01..2cfd5b1 100644
--- a/include/bootchooser.h
+++ b/include/bootchooser.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __BOOTCHOOSER_H
 #define __BOOTCHOOSER_H
 
diff --git a/include/bootm.h b/include/bootm.h
index a041aa3..7782de7 100644
--- a/include/bootm.h
+++ b/include/bootm.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __BOOTM_H
 #define __BOOTM_H
 
diff --git a/include/bootsource.h b/include/bootsource.h
index 92f7f27..32295dd 100644
--- a/include/bootsource.h
+++ b/include/bootsource.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __BOOTSOURCE_H__
 #define __BOOTSOURCE_H__
 
diff --git a/include/bunzip2.h b/include/bunzip2.h
index 1152721..55404ff 100644
--- a/include/bunzip2.h
+++ b/include/bunzip2.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef DECOMPRESS_BUNZIP2_H
 #define DECOMPRESS_BUNZIP2_H
 
diff --git a/include/byteorder.h b/include/byteorder.h
index 4b255a5..c3cac85 100644
--- a/include/byteorder.h
+++ b/include/byteorder.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __BYTEORDER_H__
 #define __BYTEORDER_H__
 
diff --git a/include/cache.h b/include/cache.h
index 23841dc..37e0087 100644
--- a/include/cache.h
+++ b/include/cache.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __CACHE_H
 #define __CACHE_H
 
diff --git a/include/clock.h b/include/clock.h
index 211748f..d681bf6 100644
--- a/include/clock.h
+++ b/include/clock.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef CLOCK_H
 #define CLOCK_H
 
diff --git a/include/cmdlinepart.h b/include/cmdlinepart.h
index bf8cdfa..9f5bdf6 100644
--- a/include/cmdlinepart.h
+++ b/include/cmdlinepart.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __CMD_LINE_PART_H
 #define __CMD_LINE_PART_H
 
diff --git a/include/complete.h b/include/complete.h
index 491ba66..763d256 100644
--- a/include/complete.h
+++ b/include/complete.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __COMPLETE_
 #define __COMPLETE_
 
diff --git a/include/console_countdown.h b/include/console_countdown.h
index 88cadf1..df8da71 100644
--- a/include/console_countdown.h
+++ b/include/console_countdown.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __CONSOLE_COUNTDOWN_H
 #define __CONSOLE_COUNTDOWN_H
 
diff --git a/include/crc.h b/include/crc.h
index a67388f..eb97270 100644
--- a/include/crc.h
+++ b/include/crc.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __INCLUDE_CRC_H
 #define __INCLUDE_CRC_H
 
diff --git a/include/crc7.h b/include/crc7.h
index 0c41cc3..27d2dae 100644
--- a/include/crc7.h
+++ b/include/crc7.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef _LINUX_CRC7_H
 #define _LINUX_CRC7_H
 #include <common.h>
diff --git a/include/dirent.h b/include/dirent.h
index 1df5d90..d7b5e78 100644
--- a/include/dirent.h
+++ b/include/dirent.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __DIRENT_H
 #define __DIRENT_H
 
diff --git a/include/dma-dir.h b/include/dma-dir.h
index 970764c..d3b1a27 100644
--- a/include/dma-dir.h
+++ b/include/dma-dir.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __DMA_DIR_H
 #define __DMA_DIR_H
 
diff --git a/include/efi.h b/include/efi.h
index 43c0593..5698a84 100644
--- a/include/efi.h
+++ b/include/efi.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef _LINUX_EFI_H
 #define _LINUX_EFI_H
 
diff --git a/include/elf.h b/include/elf.h
index 44be07f..113728f 100644
--- a/include/elf.h
+++ b/include/elf.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef _LINUX_ELF_H
 #define _LINUX_ELF_H
 
diff --git a/include/envfs.h b/include/envfs.h
index c8fc375..d4e2c61 100644
--- a/include/envfs.h
+++ b/include/envfs.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef _ENVFS_H
 #define _ENVFS_H
 
diff --git a/include/errno.h b/include/errno.h
index 496ccab..50f00de 100644
--- a/include/errno.h
+++ b/include/errno.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __ERRNO_H
 #define __ERRNO_H
 
diff --git a/include/fb.h b/include/fb.h
index 271b939..e17d07a 100644
--- a/include/fb.h
+++ b/include/fb.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __FB_H
 #define __FB_H
 
diff --git a/include/fcntl.h b/include/fcntl.h
index 98020bd..2e7c0ee 100644
--- a/include/fcntl.h
+++ b/include/fcntl.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __FCNTL_H
 #define __FCNTL_H
 
diff --git a/include/fdt.h b/include/fdt.h
index 38a2d27..232514c 100644
--- a/include/fdt.h
+++ b/include/fdt.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef _FDT_H
 #define _FDT_H
 
diff --git a/include/file-list.h b/include/file-list.h
index 404d8d6..9a9edfa 100644
--- a/include/file-list.h
+++ b/include/file-list.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __FILE_LIST
 #define __FILE_LIST
 
diff --git a/include/filetype.h b/include/filetype.h
index db95fda..c3a5bdf 100644
--- a/include/filetype.h
+++ b/include/filetype.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __FILE_TYPE_H
 #define __FILE_TYPE_H
 
diff --git a/include/fs.h b/include/fs.h
index 38debfc..04ec132 100644
--- a/include/fs.h
+++ b/include/fs.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __FS_H
 #define __FS_H
 
diff --git a/include/globalvar.h b/include/globalvar.h
index 67391e2..fc85e93 100644
--- a/include/globalvar.h
+++ b/include/globalvar.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __GLOBALVAR_H
 #define __GLOBALVAR_H
 
diff --git a/include/gpio.h b/include/gpio.h
index 0c0c033..98c5b93 100644
--- a/include/gpio.h
+++ b/include/gpio.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __GPIO_H
 #define __GPIO_H
 
diff --git a/include/gpio_keys.h b/include/gpio_keys.h
index f4a22e1..f12bed2 100644
--- a/include/gpio_keys.h
+++ b/include/gpio_keys.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef _GPIO_KEYS_H
 #define _GPIO_KEYS_H
 
diff --git a/include/gunzip.h b/include/gunzip.h
index b901894..0a959d5 100644
--- a/include/gunzip.h
+++ b/include/gunzip.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef GUNZIP_H
 #define GUNZIP_H
 
diff --git a/include/image-metadata.h b/include/image-metadata.h
index 5904d95..330ca35 100644
--- a/include/image-metadata.h
+++ b/include/image-metadata.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __INCLUDE_IMAGE_METADTA_H
 #define __INCLUDE_IMAGE_METADTA_H
 
diff --git a/include/init.h b/include/init.h
index 527d49a..d1cef14 100644
--- a/include/init.h
+++ b/include/init.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef _INIT_H
 #define _INIT_H
 
diff --git a/include/io.h b/include/io.h
index 8eb56b0..9130020 100644
--- a/include/io.h
+++ b/include/io.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __IO_H
 #define __IO_H
 
diff --git a/include/ioctl.h b/include/ioctl.h
index 1ade20f..3290a52 100644
--- a/include/ioctl.h
+++ b/include/ioctl.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __IOCTL_H
 #define __IOCTL_H
 
diff --git a/include/kallsyms.h b/include/kallsyms.h
index 69b84d2..e0b3ff7 100644
--- a/include/kallsyms.h
+++ b/include/kallsyms.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __KALLSYMS_H
 #define __KALLSYMS_H
 
diff --git a/include/kgdb.h b/include/kgdb.h
index f543cd6..1f23833 100644
--- a/include/kgdb.h
+++ b/include/kgdb.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __KGDB_H__
 #define __KGDB_H__
 
diff --git a/include/led.h b/include/led.h
index 0ce8571..6b6aff9 100644
--- a/include/led.h
+++ b/include/led.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __LED_H
 #define __LED_H
 
diff --git a/include/libbb.h b/include/libbb.h
index d05c190..a3a13b4 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1,4 +1,4 @@
-
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __LIBBB_H
 #define __LIBBB_H
 
diff --git a/include/libfile.h b/include/libfile.h
index f1d6951..350dddd 100644
--- a/include/libfile.h
+++ b/include/libfile.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __LIBFILE_H
 #define __LIBFILE_H
 
diff --git a/include/libgen.h b/include/libgen.h
index 71f06eb..6c0f039 100644
--- a/include/libgen.h
+++ b/include/libgen.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __LIBGEN_H
 #define __LIBGEN_H
 
diff --git a/include/lzo.h b/include/lzo.h
index 6c34be1..f46f38b 100644
--- a/include/lzo.h
+++ b/include/lzo.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __LZO_H__
 #define __LZO_H__
 /*
diff --git a/include/magicvar.h b/include/magicvar.h
index bb5bd25..9fb89a8 100644
--- a/include/magicvar.h
+++ b/include/magicvar.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __MAGIC_VARS_H
 #define __MAGIC_VARS_H
 
diff --git a/include/malloc.h b/include/malloc.h
index 0d3c9e9..971fc40 100644
--- a/include/malloc.h
+++ b/include/malloc.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __MALLOC_H
 #define __MALLOC_H
 
diff --git a/include/math.h b/include/math.h
index 5648e3f..1e59a84 100644
--- a/include/math.h
+++ b/include/math.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /* math.h - interface to shell math "library" -- this allows shells to share
  *          the implementation of arithmetic $((...)) expansions.
  *
diff --git a/include/memory.h b/include/memory.h
index 73ee766..906d9f7 100644
--- a/include/memory.h
+++ b/include/memory.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __MEM_MALLOC_H
 #define __MEM_MALLOC_H
 
diff --git a/include/memtest.h b/include/memtest.h
index 0100a6c..df0a391 100644
--- a/include/memtest.h
+++ b/include/memtest.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __MEMTEST_H
 #define __MEMTEST_H
 
diff --git a/include/mmu.h b/include/mmu.h
index 66b246f..2e23853 100644
--- a/include/mmu.h
+++ b/include/mmu.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __MMU_H
 #define __MMU_H
 
diff --git a/include/module.h b/include/module.h
index 460a34f..abf740a 100644
--- a/include/module.h
+++ b/include/module.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __MODULE_H
 #define __MODULE_H
 
diff --git a/include/nand.h b/include/nand.h
index fb3b5a1..f0114a2 100644
--- a/include/nand.h
+++ b/include/nand.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __NAND_H__
 #define __NAND_H__
 
diff --git a/include/notifier.h b/include/notifier.h
index e0df3e6..432b66c 100644
--- a/include/notifier.h
+++ b/include/notifier.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __NOTIFIER_H
 #define __NOTIFIER_H
 
diff --git a/include/of.h b/include/of.h
index 67601ce..8d6c018 100644
--- a/include/of.h
+++ b/include/of.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __OF_H
 #define __OF_H
 
diff --git a/include/of_address.h b/include/of_address.h
index 350ecae..66117b1 100644
--- a/include/of_address.h
+++ b/include/of_address.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __OF_ADDRESS_H
 #define __OF_ADDRESS_H
 
diff --git a/include/of_device.h b/include/of_device.h
index 54410ad..244f5fc 100644
--- a/include/of_device.h
+++ b/include/of_device.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __OF_DEVICE_H
 #define __OF_DEVICE_H
 
diff --git a/include/of_pci.h b/include/of_pci.h
index c95cb01..c787150 100644
--- a/include/of_pci.h
+++ b/include/of_pci.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __OF_PCI_H
 #define __OF_PCI_H
 
diff --git a/include/param.h b/include/param.h
index d75f50e..2d68338 100644
--- a/include/param.h
+++ b/include/param.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef PARAM_H
 #define PARAM_H
 
diff --git a/include/parseopt.h b/include/parseopt.h
index 273a371..5a40bdc 100644
--- a/include/parseopt.h
+++ b/include/parseopt.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __PARSEOPT_H__
 #define __PARSEOPT_H__
 void parseopt_llu_suffix(const char *options, const char *opt,
diff --git a/include/partition.h b/include/partition.h
index 3257053..373134a 100644
--- a/include/partition.h
+++ b/include/partition.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __PARTITION_H
 #define __PARTITION_H
 
diff --git a/include/phy-id-list.h b/include/phy-id-list.h
index a6070a0..f770c77 100644
--- a/include/phy-id-list.h
+++ b/include/phy-id-list.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * List of all Etherenet PHY IDs that is not found in any .h files in
  * include/linux
diff --git a/include/pinctrl.h b/include/pinctrl.h
index 7d87169..0fd7f49 100644
--- a/include/pinctrl.h
+++ b/include/pinctrl.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef PINCTRL_H
 #define PINCTRL_H
 
diff --git a/include/poweroff.h b/include/poweroff.h
index ae9557d..217b68c 100644
--- a/include/poweroff.h
+++ b/include/poweroff.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __INCLUDE_POWEROFF_H
 #define __INCLUDE_POWEROFF_H
 
diff --git a/include/printk.h b/include/printk.h
index b0d5d09..6a02717 100644
--- a/include/printk.h
+++ b/include/printk.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __PRINTK_H
 #define __PRINTK_H
 
diff --git a/include/progress.h b/include/progress.h
index 5c4dd1e..75aa9c4 100644
--- a/include/progress.h
+++ b/include/progress.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __PROGRSS_H
 #define __PROGRSS_H
 
diff --git a/include/pwm.h b/include/pwm.h
index 911c760..dcc81af 100644
--- a/include/pwm.h
+++ b/include/pwm.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __PWM_H
 #define __PWM_H
 
diff --git a/include/qsort.h b/include/qsort.h
index d279dc2..f8d889e 100644
--- a/include/qsort.h
+++ b/include/qsort.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __QSORT_H
 #define __QSORT_H
 
diff --git a/include/ratp.h b/include/ratp.h
index d2a8192..effa288 100644
--- a/include/ratp.h
+++ b/include/ratp.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __RATP_H
 #define __RATP_H
 
diff --git a/include/ratp_bb.h b/include/ratp_bb.h
index b669997..a4f28c6 100644
--- a/include/ratp_bb.h
+++ b/include/ratp_bb.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __RATP_BB_H
 #define __RATP_BB_H
 
diff --git a/include/readkey.h b/include/readkey.h
index ed1cd15..fdb9642 100644
--- a/include/readkey.h
+++ b/include/readkey.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef READKEY_H
 #define READKEY_H
 
diff --git a/include/regmap.h b/include/regmap.h
index 09b7b57..8528f81 100644
--- a/include/regmap.h
+++ b/include/regmap.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __REGMAP_H
 #define __REGMAP_H
 
diff --git a/include/regulator.h b/include/regulator.h
index a445c5c..d01535d 100644
--- a/include/regulator.h
+++ b/include/regulator.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __REGULATOR_H
 #define __REGULATOR_H
 
diff --git a/include/restart.h b/include/restart.h
index 79b57c8..7ec0910 100644
--- a/include/restart.h
+++ b/include/restart.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __INCLUDE_RESTART_H
 #define __INCLUDE_RESTART_H
 
diff --git a/include/serdev.h b/include/serdev.h
index 2903053..0d020b8 100644
--- a/include/serdev.h
+++ b/include/serdev.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef _SERDEV_H_
 #define _SERDEV_H_
 
diff --git a/include/sntp.h b/include/sntp.h
index bfcfcfa..05cad12 100644
--- a/include/sntp.h
+++ b/include/sntp.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __SNTP_H
 #define __SNTP_H
 
diff --git a/include/state.h b/include/state.h
index d98b781..be1b592 100644
--- a/include/state.h
+++ b/include/state.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __STATE_H
 #define __STATE_H
 
diff --git a/include/stdio.h b/include/stdio.h
index 46e2778..1cb11e8 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __STDIO_H
 #define __STDIO_H
 
diff --git a/include/stdlib.h b/include/stdlib.h
index ee3f229..d405608 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __STDLIB_H
 #define __STDLIB_H
 
diff --git a/include/string.h b/include/string.h
index 8c63f22..120a613 100644
--- a/include/string.h
+++ b/include/string.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __STRING_H
 #define __STRING_H
 
diff --git a/include/stringlist.h b/include/stringlist.h
index e85500a..5cd452c 100644
--- a/include/stringlist.h
+++ b/include/stringlist.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __STRINGLIST_H
 #define __STRINGLIST_H
 
diff --git a/include/twl6030_pwrbtn.h b/include/twl6030_pwrbtn.h
index c4e13d1..4c8e166 100644
--- a/include/twl6030_pwrbtn.h
+++ b/include/twl6030_pwrbtn.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef _TWL6030_PWRBTN_H
 #define _TWL6030_PWRBTN_H
 
diff --git a/include/types.h b/include/types.h
index 0bfe3b9..a673939 100644
--- a/include/types.h
+++ b/include/types.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __TYPES_H
 #define __TYPES_H
 
diff --git a/include/ubiformat.h b/include/ubiformat.h
index 8a7a16a..eca62ae 100644
--- a/include/ubiformat.h
+++ b/include/ubiformat.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __UBIFORMAT_H
 #define __UBIFORMAT_H
 
diff --git a/include/uncompress.h b/include/uncompress.h
index d146c90..4bdb03d 100644
--- a/include/uncompress.h
+++ b/include/uncompress.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __UNCOMPRESS_H
 #define __UNCOMPRESS_H
 
diff --git a/include/unistd.h b/include/unistd.h
index f392e6d..06ce355 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __UNISTD_H
 #define __UNISTD_H
 
diff --git a/include/usb_dfu_trailer.h b/include/usb_dfu_trailer.h
index 2cf66a5..64b8407 100644
--- a/include/usb_dfu_trailer.h
+++ b/include/usb_dfu_trailer.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef _USB_DFU_TRAILER_H
 #define _USB_DFU_TRAILER_H
 
diff --git a/include/wchar.h b/include/wchar.h
index adb4f37..b601cc6 100644
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __WCHAR_H
 #define __WCHAR_H
 
diff --git a/include/xfuncs.h b/include/xfuncs.h
index e3f120a..a9132d3 100644
--- a/include/xfuncs.h
+++ b/include/xfuncs.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __XFUNCS_H
 #define __XFUNCS_H