Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull timer updates from Thomas Gleixner:
 "The timer department delivers the following christmas presents:

  Core code:

   - Use proper seqcount initializer to make lockdep happy

   - SPDX annotations and cleanup of license boilerplates

   - Use DEFINE_SHOW_ATTRIBUTE() instead of open coding it

   - Minor cleanups

  Driver code:

   - Add the sched_clock for the arc timer (Alexey Brodkin)

   - Change the file timer names for riscv, rockchip, tegra20, sun4i and
     meson6 (Daniel Lezcano)

   - Add the DT bindings for r8a7796, r8a77470 and r8a774a1 (Biju Das)

   - Remove the early platform driver registration for timer-ti-dm
     (Bartosz Golaszewski)

   - Provide the sched_clock for the riscv timer (Anup Patel)

   - Add support for ARM64 for the imx-gpt and convert the imx-tpm to
     the timer-of API (Anson Huang)

   - Remove useless irq protection for the imx-gpt (Clément Péron)

   - Remove a duplicate function name for the vt8500 (Dan Carpenter)

   - Remove obsolete inclusion of <asm/smp_twd.h> for the tegra20 (Geert
     Uytterhoeven)

   - Demote the prcmu and the custom sched_clock for the dbx500 and the
     ux500 (Linus Walleij)

   - Add a new timer clock for the RDA8810PL (Manivannan Sadhasivam)

   - Rename the macro to stick to the register name and add the delay
     timer (Martin Blumenstingl)

   - Switch the bcm2835 to the SPDX identifier (Stefan Wahren)

   - Fix the interrupt register access on the fttmr010 (Tao Ren)

   - Add missing of_node_put in the initialization path on the
     integrator-ap (Yangtao Li)"

* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (39 commits)
  dt-bindings: timer: Document RDA8810PL SoC timer
  clocksource/drivers/rda: Add clock driver for RDA8810PL SoC
  clocksource/drivers/meson6: Change name meson6_timer timer-meson6
  clocksource/drivers/sun4i: Change name sun4i_timer to timer-sun4i
  clocksource/drivers/tegra20: Change name tegra20_timer to timer-tegra20
  clocksource/drivers/rockchip: Change name rockchip_timer to timer-rockchip
  clocksource/drivers/riscv: Change name riscv_timer to timer-riscv
  clocksource/drivers/riscv_timer: Provide the sched_clock
  clocksource/drivers/timer-imx-tpm: Specify clock name for timer-of
  clocksource/drivers/fttmr010: Fix invalid interrupt register access
  clocksource/drivers/integrator-ap: Add missing of_node_put()
  clocksource/drivers/bcm2835: Switch to SPDX identifier
  dt-bindings: timer: renesas, cmt: Document r8a774a1 CMT support
  clocksource/drivers/timer-imx-tpm: Convert the driver to timer-of
  clocksource/drivers/arc_timer: Utilize generic sched_clock
  dt-bindings: timer: renesas, cmt: Document r8a77470 CMT support
  dt-bindings: timer: renesas, cmt: Document r8a7796 CMT support
  clocksource/drivers/imx-gpt: Remove unnecessary irq protection
  clocksource/drivers/imx-gpt: Add support for ARM64
  clocksource/drivers/meson6_timer: Implement the ARM delay timer
  ...

25 files changed, 52 insertions, 218 deletions

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index fa5de5e8de61..2c97e8c2d29f 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Alarmtimer interface
  *
@@ -10,10 +11,6 @@
  * Copyright (C) 2010 IBM Corperation
  *
  * Author: John Stultz <john.stultz@linaro.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 #include <linux/time.h>
 #include <linux/hrtimer.h>
diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index 8c0e4092f661..5e77662dd2d9 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -1,14 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
- * linux/kernel/time/clockevents.c
- *
  * This file contains functions which manage clock event devices.
  *
  * Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
  * Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
  * Copyright(C) 2006-2007, Timesys Corp., Thomas Gleixner
- *
- * This code is licenced under the GPL version 2. For details see
- * kernel-base/COPYING.
  */
 
 #include <linux/clockchips.h>
@@ -39,10 +35,8 @@ static u64 cev_delta2ns(unsigned long latch, struct clock_event_device *evt,
 	u64 clc = (u64) latch << evt->shift;
 	u64 rnd;
 
-	if (unlikely(!evt->mult)) {
+	if (WARN_ON(!evt->mult))
 		evt->mult = 1;
-		WARN_ON(1);
-	}
 	rnd = (u64) evt->mult - 1;
 
 	/*
@@ -164,10 +158,8 @@ void clockevents_switch_state(struct clock_event_device *dev,
 		 * on it, so fix it up and emit a warning:
 		 */
 		if (clockevent_state_oneshot(dev)) {
-			if (unlikely(!dev->mult)) {
+			if (WARN_ON(!dev->mult))
 				dev->mult = 1;
-				WARN_ON(1);
-			}
 		}
 	}
 }
@@ -315,10 +307,8 @@ int clockevents_program_event(struct clock_event_device *dev, ktime_t expires,
 	int64_t delta;
 	int rc;
 
-	if (unlikely(expires < 0)) {
-		WARN_ON_ONCE(1);
+	if (WARN_ON_ONCE(expires < 0))
 		return -ETIME;
-	}
 
 	dev->next_event = expires;
 
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index ffe081623aec..3bcc19ceb073 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -1,26 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
- * linux/kernel/time/clocksource.c
- *
  * This file contains the functions which manage clocksource drivers.
  *
  * Copyright (C) 2004, 2005 IBM, John Stultz (johnstul@us.ibm.com)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- * TODO WishList:
- *   o Allow clocksource drivers to be unregistered
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 9cdd74bd2d27..f5cfa1b73d6f 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1,34 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
- *  linux/kernel/hrtimer.c
- *
  *  Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
  *  Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
  *  Copyright(C) 2006-2007  Timesys Corp., Thomas Gleixner
  *
  *  High-resolution kernel timers
  *
- *  In contrast to the low-resolution timeout API implemented in
- *  kernel/timer.c, hrtimers provide finer resolution and accuracy
- *  depending on system configuration and capabilities.
- *
- *  These timers are currently used for:
- *   - itimers
- *   - POSIX timers
- *   - nanosleep
- *   - precise in-kernel timing
+ *  In contrast to the low-resolution timeout API, aka timer wheel,
+ *  hrtimers provide finer resolution and accuracy depending on system
+ *  configuration and capabilities.
  *
  *  Started by: Thomas Gleixner and Ingo Molnar
  *
  *  Credits:
- *	based on kernel/timer.c
+ *	Based on the original timer wheel code
  *
  *	Help, testing, suggestions, bugfixes, improvements were
  *	provided by:
  *
  *	George Anzinger, Andrew Morton, Steven Rostedt, Roman Zippel
  *	et. al.
- *
- *  For licencing details see kernel-base/COPYING
  */
 
 #include <linux/cpu.h>
diff --git a/kernel/time/itimer.c b/kernel/time/itimer.c
index 9a65713c8309..02068b2d5862 100644
--- a/kernel/time/itimer.c
+++ b/kernel/time/itimer.c
@@ -1,7 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * linux/kernel/itimer.c
- *
  * Copyright (C) 1992 Darren Senn
  */
 
diff --git a/kernel/time/jiffies.c b/kernel/time/jiffies.c
index 497719127bf9..dc1b6f1929f9 100644
--- a/kernel/time/jiffies.c
+++ b/kernel/time/jiffies.c
@@ -1,25 +1,9 @@
-/***********************************************************************
-* linux/kernel/time/jiffies.c
-*
-* This file contains the jiffies based clocksource.
-*
-* Copyright (C) 2004, 2005 IBM, John Stultz (johnstul@us.ibm.com)
-*
-* This program is free software; you can redistribute it and/or modify
-* it under the terms of the GNU General Public License as published by
-* the Free Software Foundation; either version 2 of the License, or
-* (at your option) any later version.
-*
-* This program is distributed in the hope that it will be useful,
-* but WITHOUT ANY WARRANTY; without even the implied warranty of
-* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-* GNU General Public License for more details.
-*
-* You should have received a copy of the GNU General Public License
-* along with this program; if not, write to the Free Software
-* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-*
-************************************************************************/
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * This file contains the jiffies based clocksource.
+ *
+ * Copyright (C) 2004, 2005 IBM, John Stultz (johnstul@us.ibm.com)
+ */
 #include <linux/clocksource.h>
 #include <linux/jiffies.h>
 #include <linux/module.h>
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index c5e0cba3b39c..bc3a3c37ec9c 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -17,7 +17,6 @@
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/rtc.h>
-#include <linux/math64.h>
 
 #include "ntp_internal.h"
 #include "timekeeping_internal.h"
diff --git a/kernel/time/posix-clock.c b/kernel/time/posix-clock.c
index fe56c4e06c51..425bbfce6819 100644
--- a/kernel/time/posix-clock.c
+++ b/kernel/time/posix-clock.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
- * posix-clock.c - support for dynamic clock devices
+ * Support for dynamic clock devices
  *
  * Copyright (C) 2010 OMICRON electronics GmbH
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 #include <linux/device.h>
 #include <linux/export.h>
diff --git a/kernel/time/posix-stubs.c b/kernel/time/posix-stubs.c
index 989ccf028bde..a51895486e5e 100644
--- a/kernel/time/posix-stubs.c
+++ b/kernel/time/posix-stubs.c
@@ -1,12 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Dummy stubs used when CONFIG_POSIX_TIMERS=n
  *
  * Created by:  Nicolas Pitre, July 2016
  * Copyright:   (C) 2016 Linaro Limited
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 
 #include <linux/linkage.h>
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index 31f49ae80f43..0e84bb72a3da 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -1,34 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
- * linux/kernel/posix-timers.c
- *
- *
  * 2002-10-15  Posix Clocks & timers
  *                           by George Anzinger george@mvista.com
- *
  *			     Copyright (C) 2002 2003 by MontaVista Software.
  *
  * 2004-06-01  Fix CLOCK_REALTIME clock/timer TIMER_ABSTIME bug.
  *			     Copyright (C) 2004 Boris Hu
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or (at
- * your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
-
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- * MontaVista Software | 1237 East Arques Avenue | Sunnyvale | CA 94085 | USA
- */
-
-/* These are all the functions necessary to implement
- * POSIX clocks & timers
+ * These are all the functions necessary to implement POSIX clocks & timers
  */
 #include <linux/mm.h>
 #include <linux/interrupt.h>
diff --git a/kernel/time/sched_clock.c b/kernel/time/sched_clock.c
index cbc72c2c1fca..094b82ca95e5 100644
--- a/kernel/time/sched_clock.c
+++ b/kernel/time/sched_clock.c
@@ -1,10 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
- * sched_clock.c: Generic sched_clock() support, to extend low level
- *                hardware time counters to full 64-bit ns values.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
+ * Generic sched_clock() support, to extend low level hardware time
+ * counters to full 64-bit ns values.
  */
 #include <linux/clocksource.h>
 #include <linux/init.h>
diff --git a/kernel/time/test_udelay.c b/kernel/time/test_udelay.c
index b0928ab3270f..77c63005dc4e 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
  *
@@ -7,15 +8,6 @@
  * Specifying usecs of 0 or negative values will run multiples tests.
  *
  * Copyright (C) 2014 Google, Inc.
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
  */
 
 #include <linux/debugfs.h>
diff --git a/kernel/time/tick-broadcast-hrtimer.c b/kernel/time/tick-broadcast-hrtimer.c
index a59641fb88b6..5be6154e2fd2 100644
--- a/kernel/time/tick-broadcast-hrtimer.c
+++ b/kernel/time/tick-broadcast-hrtimer.c
@@ -1,8 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * linux/kernel/time/tick-broadcast-hrtimer.c
- * This file emulates a local clock event device
- * via a pseudo clock device.
+ * Emulate a local clock event device via a pseudo clock device.
  */
 #include <linux/cpu.h>
 #include <linux/err.h>
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index be0aac2b4300..803fa67aace9 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -1,15 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
- * linux/kernel/time/tick-broadcast.c
- *
  * This file contains functions which emulate a local clock-event
  * device via a broadcast event source.
  *
  * Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
  * Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
  * Copyright(C) 2006-2007, Timesys Corp., Thomas Gleixner
- *
- * This code is licenced under the GPL version 2. For details see
- * kernel-base/COPYING.
  */
 #include <linux/cpu.h>
 #include <linux/err.h>
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index 14de3727b18e..529143b4c8d2 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -1,15 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
- * linux/kernel/time/tick-common.c
- *
  * This file contains the base functions to manage periodic tick
  * related events.
  *
  * Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
  * Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
  * Copyright(C) 2006-2007, Timesys Corp., Thomas Gleixner
- *
- * This code is licenced under the GPL version 2. For details see
- * kernel-base/COPYING.
  */
 #include <linux/cpu.h>
 #include <linux/err.h>
diff --git a/kernel/time/tick-oneshot.c b/kernel/time/tick-oneshot.c
index 6fe615d57ebb..f9745d47425a 100644
--- a/kernel/time/tick-oneshot.c
+++ b/kernel/time/tick-oneshot.c
@@ -1,15 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
- * linux/kernel/time/tick-oneshot.c
- *
  * This file contains functions which manage high resolution tick
  * related events.
  *
  * Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
  * Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
  * Copyright(C) 2006-2007, Timesys Corp., Thomas Gleixner
- *
- * This code is licenced under the GPL version 2. For details see
- * kernel-base/COPYING.
  */
 #include <linux/cpu.h>
 #include <linux/err.h>
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 69e673b88474..6fa52cd6df0b 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -1,6 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
- *  linux/kernel/time/tick-sched.c
- *
  *  Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
  *  Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
  *  Copyright(C) 2006-2007  Timesys Corp., Thomas Gleixner
@@ -8,8 +7,6 @@
  *  No idle tick implementation for low and high resolution timers
  *
  *  Started by: Thomas Gleixner and Ingo Molnar
- *
- *  Distribute under GPLv2.
  */
 #include <linux/cpu.h>
 #include <linux/err.h>
diff --git a/kernel/time/time.c b/kernel/time/time.c
index ad204cf6d001..5aa0a156e331 100644
--- a/kernel/time/time.c
+++ b/kernel/time/time.c
@@ -1,14 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
- *  linux/kernel/time.c
- *
  *  Copyright (C) 1991, 1992  Linus Torvalds
  *
- *  This file contains the interface functions for the various
- *  time related system calls: time, stime, gettimeofday, settimeofday,
- *			       adjtime
- */
-/*
- * Modification history kernel/time.c
+ *  This file contains the interface functions for the various time related
+ *  system calls: time, stime, gettimeofday, settimeofday, adjtime
+ *
+ * Modification history:
  *
  * 1993-09-02    Philip Gladstone
  *      Created file with time related functions from sched/core.c and adjtimex()
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 8afd78932bdf..85b98e727306 100644
--- a/kernel/time/timecounter.c
+++ b/kernel/time/timecounter.c
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
- * linux/kernel/time/timecounter.c
- *
- * based on code that migrated away from
- * linux/kernel/time/clocksource.c
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * Based on clocksource code. See commit 74d23cc704d1
  */
-
 #include <linux/export.h>
 #include <linux/timecounter.h>
 
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 2d110c948805..c801e25875a3 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1,13 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
- *  linux/kernel/time/timekeeping.c
- *
- *  Kernel timekeeping code and accessor functions
- *
- *  This code was moved from linux/kernel/timer.c.
- *  Please see that file for copyright and history logs.
- *
+ *  Kernel timekeeping code and accessor functions. Based on code from
+ *  timer.c, moved in commit 8524070b7982.
  */
-
 #include <linux/timekeeper_internal.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
@@ -50,7 +45,9 @@ enum timekeeping_adv_mode {
 static struct {
 	seqcount_t		seq;
 	struct timekeeper	timekeeper;
-} tk_core ____cacheline_aligned;
+} tk_core ____cacheline_aligned = {
+	.seq = SEQCNT_ZERO(tk_core.seq),
+};
 
 static DEFINE_RAW_SPINLOCK(timekeeper_lock);
 static struct timekeeper shadow_timekeeper;
diff --git a/kernel/time/timekeeping_debug.c b/kernel/time/timekeeping_debug.c
index 238e4be60229..86489950d690 100644
--- a/kernel/time/timekeeping_debug.c
+++ b/kernel/time/timekeeping_debug.c
@@ -1,17 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * debugfs file to track time spent in suspend
  *
  * Copyright (c) 2011, Google, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
  */
 
 #include <linux/debugfs.h>
@@ -28,7 +19,7 @@
 
 static unsigned int sleep_time_bin[NUM_BINS] = {0};
 
-static int tk_debug_show_sleep_time(struct seq_file *s, void *data)
+static int tk_debug_sleep_time_show(struct seq_file *s, void *data)
 {
 	unsigned int bin;
 	seq_puts(s, "      time (secs)        count\n");
@@ -42,18 +33,7 @@ static int tk_debug_show_sleep_time(struct seq_file *s, void *data)
 	}
 	return 0;
 }
-
-static int tk_debug_sleep_time_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, tk_debug_show_sleep_time, NULL);
-}
-
-static const struct file_operations tk_debug_sleep_time_fops = {
-	.open		= tk_debug_sleep_time_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(tk_debug_sleep_time);
 
 static int __init tk_debug_sleep_time_init(void)
 {
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index fa49cd753dea..444156debfa0 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1,6 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
- *  linux/kernel/timer.c
- *
  *  Kernel internal timers
  *
  *  Copyright (C) 1991, 1992  Linus Torvalds
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
index d647dabdac97..98ba50dcb1b2 100644
--- a/kernel/time/timer_list.c
+++ b/kernel/time/timer_list.c
@@ -1,13 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
- * kernel/time/timer_list.c
- *
  * List pending timers
  *
  * Copyright(C) 2006, Red Hat, Inc., Ingo Molnar
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 
 #include <linux/proc_fs.h>