diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 50ebe2ad43e0..851e4231d3ab 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  *  hrtimers - High-resolution kernel timers
  *
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index fa5de5e8de61..69070d399d70 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Alarmtimer interface
  *
diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index 9b8c7c0fd113..0fdbdf17f8a2 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file contains functions which manage clock event devices.
  *
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 1c5273fbd500..b1abeac5f3f7 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * This file contains the functions which manage clocksource drivers.
  *
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 223548bb81c6..16dacc8d3ca2 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  *  Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
  *  Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
diff --git a/kernel/time/jiffies.c b/kernel/time/jiffies.c
index 9c3957fe9317..0deb0be2c445 100644
--- a/kernel/time/jiffies.c
+++ b/kernel/time/jiffies.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /***********************************************************************
 * This file contains the jiffies based clocksource.
 *
diff --git a/kernel/time/posix-clock.c b/kernel/time/posix-clock.c
index 4959815f4fd7..339e35e4605f 100644
--- a/kernel/time/posix-clock.c
+++ b/kernel/time/posix-clock.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Support for dynamic clock devices
  *
diff --git a/kernel/time/posix-stubs.c b/kernel/time/posix-stubs.c
index 989ccf028bde..b9f9f6f02e11 100644
--- a/kernel/time/posix-stubs.c
+++ b/kernel/time/posix-stubs.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Dummy stubs used when CONFIG_POSIX_TIMERS=n
  *
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index c72307c119d9..e8cd9aa6c9cf 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * 2002-10-15  Posix Clocks & timers
  *                           by George Anzinger george@mvista.com
diff --git a/kernel/time/sched_clock.c b/kernel/time/sched_clock.c
index b38b6628f89b..11570ba451cc 100644
--- a/kernel/time/sched_clock.c
+++ b/kernel/time/sched_clock.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Generic sched_clock() support, to extend low level hardware time
  * counters to full 64-bit ns values.
diff --git a/kernel/time/test_udelay.c b/kernel/time/test_udelay.c
index b0928ab3270f..d6a87bb2040f 100644
--- a/kernel/time/test_udelay.c
+++ b/kernel/time/test_udelay.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * udelay() test kernel module
  *
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 4f5abde2dfa7..f4725f53d852 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file contains functions which emulate a local clock-event
  * device via a broadcast event source.
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index 7b5008039c2d..455b8d65a2b7 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file contains the base functions to manage periodic tick
  * related events.
diff --git a/kernel/time/tick-oneshot.c b/kernel/time/tick-oneshot.c
index 77989efe13d2..1c8ad0fb33c0 100644
--- a/kernel/time/tick-oneshot.c
+++ b/kernel/time/tick-oneshot.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file contains functions which manage high resolution tick
  * related events.
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index cb557e56a19f..62ecb2a802ca 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  *  Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
  *  Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
diff --git a/kernel/time/time.c b/kernel/time/time.c
index 13ffa9950ffc..5aa0a156e331 100644
--- a/kernel/time/time.c
+++ b/kernel/time/time.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  *  Copyright (C) 1991, 1992  Linus Torvalds
  *
diff --git a/kernel/time/timeconst.bc b/kernel/time/timeconst.bc
index f83bbb81600b..7ed0e0fb5831 100644
--- a/kernel/time/timeconst.bc
+++ b/kernel/time/timeconst.bc
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
 scale=0
 
 define gcd(a,b) {
diff --git a/kernel/time/timeconv.c b/kernel/time/timeconv.c
index 7142580ad94f..589e0a552129 100644
--- a/kernel/time/timeconv.c
+++ b/kernel/time/timeconv.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: LGPL-2.0+
 /*
  * Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
  * This file is part of the GNU C Library.
diff --git a/kernel/time/timecounter.c b/kernel/time/timecounter.c
index 400f3456d564..933462326489 100644
--- a/kernel/time/timecounter.c
+++ b/kernel/time/timecounter.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Based on clocksource code. See commit 74d23cc704d1
  *
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 30fdf48f50c2..cd02bd38cf2d 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  *  Kernel timekeeping code and accessor functions. Based on code from
  *  timer.c, moved in commit 8524070b7982.
diff --git a/kernel/time/timekeeping_debug.c b/kernel/time/timekeeping_debug.c
index 238e4be60229..d06f09209fb7 100644
--- a/kernel/time/timekeeping_debug.c
+++ b/kernel/time/timekeeping_debug.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * debugfs file to track time spent in suspend
  *
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 2f248bbedb4a..444156debfa0 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  *  Kernel internal timers
  *
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
index 5d64fff384c8..f81693cdf981 100644
--- a/kernel/time/timer_list.c
+++ b/kernel/time/timer_list.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * List pending timers
  *