hangcheck-timer: Use ktime_get_ns()

There is no point in having a S390 private implementation and there is
no point in using the raw monotonic time. The NTP freqeuency
adjustment of CLOCK_MONOTONIC is really not doing any harm for the
hang check timer.

Use ktime_get_ns() for everything and get rid of the timespec
conversions.

V2: Drop the raw monotonic and the S390 special case

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>

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;