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

Pull timer and time updates from Thomas Gleixner:
 "A rather large update of timers, timekeeping & co

   - Core timekeeping code is year-2038 safe now for 32bit machines.
     Now we just need to fix all in kernel users and the gazillion of
     user space interfaces which rely on timespec/timeval :)

   - Better cache layout for the timekeeping internal data structures.

   - Proper nanosecond based interfaces for in kernel users.

   - Tree wide cleanup of code which wants nanoseconds but does hoops
     and loops to convert back and forth from timespecs.  Some of it
     definitely belongs into the ugly code museum.

   - Consolidation of the timekeeping interface zoo.

   - A fast NMI safe accessor to clock monotonic for tracing.  This is a
     long standing request to support correlated user/kernel space
     traces.  With proper NTP frequency correction it's also suitable
     for correlation of traces accross separate machines.

   - Checkpoint/restart support for timerfd.

   - A few NOHZ[_FULL] improvements in the [hr]timer code.

   - Code move from kernel to kernel/time of all time* related code.

   - New clocksource/event drivers from the ARM universe.  I'm really
     impressed that despite an architected timer in the newer chips SoC
     manufacturers insist on inventing new and differently broken SoC
     specific timers.

[ Ed. "Impressed"? I don't think that word means what you think it means ]

   - Another round of code move from arch to drivers.  Looks like most
     of the legacy mess in ARM regarding timers is sorted out except for
     a few obnoxious strongholds.

   - The usual updates and fixlets all over the place"

* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (114 commits)
  timekeeping: Fixup typo in update_vsyscall_old definition
  clocksource: document some basic timekeeping concepts
  timekeeping: Use cached ntp_tick_length when accumulating error
  timekeeping: Rework frequency adjustments to work better w/ nohz
  timekeeping: Minor fixup for timespec64->timespec assignment
  ftrace: Provide trace clocks monotonic
  timekeeping: Provide fast and NMI safe access to CLOCK_MONOTONIC
  seqcount: Add raw_write_seqcount_latch()
  seqcount: Provide raw_read_seqcount()
  timekeeping: Use tk_read_base as argument for timekeeping_get_ns()
  timekeeping: Create struct tk_read_base and use it in struct timekeeper
  timekeeping: Restructure the timekeeper some more
  clocksource: Get rid of cycle_last
  clocksource: Move cycle_last validation to core code
  clocksource: Make delta calculation a function
  wireless: ath9k: Get rid of timespec conversions
  drm: vmwgfx: Use nsec based interfaces
  drm: i915: Use nsec based interfaces
  timekeeping: Provide ktime_get_raw()
  hangcheck-timer: Use ktime_get_ns()
  ...

1 files changed, 5 insertions, 28 deletions

diff --git a/drivers/char/hangcheck-timer.c b/drivers/char/hangcheck-timer.c
index f953c96efc86..ebc4c73d8ca4 100644
--- a/drivers/char/hangcheck-timer.c
+++ b/drivers/char/hangcheck-timer.c
@@ -49,7 +49,7 @@
 #include <asm/uaccess.h>
 #include <linux/sysrq.h>
 #include <linux/timer.h>
-#include <linux/time.h>
+#include <linux/hrtimer.h>
 
 #define VERSION_STR "0.9.1"
 
@@ -117,24 +117,7 @@ __setup("hcheck_reboot", hangcheck_parse_reboot);
 __setup("hcheck_dump_tasks", hangcheck_parse_dump_tasks);
 #endif /* not MODULE */
 
-#if defined(CONFIG_S390)
-# define HAVE_MONOTONIC
-# define TIMER_FREQ 1000000000ULL
-#else
-# define TIMER_FREQ 1000000000ULL
-#endif
-
-#ifdef HAVE_MONOTONIC
-extern unsigned long long monotonic_clock(void);
-#else
-static inline unsigned long long monotonic_clock(void)
-{
-	struct timespec ts;
-	getrawmonotonic(&ts);
-	return timespec_to_ns(&ts);
-}
-#endif  /* HAVE_MONOTONIC */
-
+#define TIMER_FREQ 1000000000ULL
 
 /* Last time scheduled */
 static unsigned long long hangcheck_tsc, hangcheck_tsc_margin;
@@ -143,12 +126,11 @@ static void hangcheck_fire(unsigned long);
 
 static DEFINE_TIMER(hangcheck_ticktock, hangcheck_fire, 0, 0);
 
-
 static void hangcheck_fire(unsigned long data)
 {
 	unsigned long long cur_tsc, tsc_diff;
 
-	cur_tsc = monotonic_clock();
+	cur_tsc = ktime_get_ns();
 
 	if (cur_tsc > hangcheck_tsc)
 		tsc_diff = cur_tsc - hangcheck_tsc;
@@ -177,7 +159,7 @@ static void hangcheck_fire(unsigned long data)
 			tsc_diff, tsc_diff - hangcheck_tick*TIMER_FREQ);
 #endif
 	mod_timer(&hangcheck_ticktock, jiffies + (hangcheck_tick*HZ));
-	hangcheck_tsc = monotonic_clock();
+	hangcheck_tsc = ktime_get_ns();
 }
 
 
@@ -185,16 +167,11 @@ static int __init hangcheck_init(void)
 {
 	printk("Hangcheck: starting hangcheck timer %s (tick is %d seconds, margin is %d seconds).\n",
 	       VERSION_STR, hangcheck_tick, hangcheck_margin);
-#if defined (HAVE_MONOTONIC)
-	printk("Hangcheck: Using monotonic_clock().\n");
-#else
-	printk("Hangcheck: Using getrawmonotonic().\n");
-#endif  /* HAVE_MONOTONIC */
 	hangcheck_tsc_margin =
 		(unsigned long long)(hangcheck_margin + hangcheck_tick);
 	hangcheck_tsc_margin *= (unsigned long long)TIMER_FREQ;
 
-	hangcheck_tsc = monotonic_clock();
+	hangcheck_tsc = ktime_get_ns();
 	mod_timer(&hangcheck_ticktock, jiffies + (hangcheck_tick*HZ));
 
 	return 0;