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

Pull timer core update from Thomas Gleixner:
 - Bug fixes (one for a longstanding dead loop issue)
 - Rework of time related vsyscalls
 - Alarm timer updates
 - Jiffies updates to remove compile time dependencies

* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  timekeeping: Cast raw_interval to u64 to avoid shift overflow
  timers: Fix endless looping between cascade() and internal_add_timer()
  time/jiffies: bring back unconditional LATCH definition
  time: Convert x86_64 to using new update_vsyscall
  time: Only do nanosecond rounding on GENERIC_TIME_VSYSCALL_OLD systems
  time: Introduce new GENERIC_TIME_VSYSCALL
  time: Convert CONFIG_GENERIC_TIME_VSYSCALL to CONFIG_GENERIC_TIME_VSYSCALL_OLD
  time: Move update_vsyscall definitions to timekeeper_internal.h
  time: Move timekeeper structure to timekeeper_internal.h for vsyscall changes
  jiffies: Remove compile time assumptions about CLOCK_TICK_RATE
  jiffies: Kill unused TICK_USEC_TO_NSEC
  alarmtimer: Rename alarmtimer_remove to alarmtimer_dequeue
  alarmtimer: Remove unused helpers & defines
  alarmtimer: Use hrtimer per-alarm instead of per-base
  alarmtimer: Implement minimum alarm interval for allowing suspend

4 files changed, 113 insertions, 62 deletions

diff --git a/include/linux/alarmtimer.h b/include/linux/alarmtimer.h
index 96c5c249b086..9069694e70eb 100644
--- a/include/linux/alarmtimer.h
+++ b/include/linux/alarmtimer.h
@@ -21,7 +21,6 @@ enum alarmtimer_restart {
 
 #define ALARMTIMER_STATE_INACTIVE       0x00
 #define ALARMTIMER_STATE_ENQUEUED       0x01
-#define ALARMTIMER_STATE_CALLBACK       0x02
 
 /**
  * struct alarm - Alarm timer structure
@@ -35,6 +34,7 @@ enum alarmtimer_restart {
  */
 struct alarm {
         struct timerqueue_node  node;
+        struct hrtimer          timer;
         enum alarmtimer_restart (*function)(struct alarm *, ktime_t now);
         enum alarmtimer_type    type;
         int                     state;
@@ -43,39 +43,12 @@ struct alarm {
 
 void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
                 enum alarmtimer_restart (*function)(struct alarm *, ktime_t));
-void alarm_start(struct alarm *alarm, ktime_t start);
+int alarm_start(struct alarm *alarm, ktime_t start);
 int alarm_try_to_cancel(struct alarm *alarm);
 int alarm_cancel(struct alarm *alarm);
 
 u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval);
 
-/*
- * A alarmtimer is active, when it is enqueued into timerqueue or the
- * callback function is running.
- */
-static inline int alarmtimer_active(const struct alarm *timer)
-{
-        return timer->state != ALARMTIMER_STATE_INACTIVE;
-}
-
-/*
- * Helper function to check, whether the timer is on one of the queues
- */
-static inline int alarmtimer_is_queued(struct alarm *timer)
-{
-        return timer->state & ALARMTIMER_STATE_ENQUEUED;
-}
-
-/*
- * Helper function to check, whether the timer is running the callback
- * function
- */
-static inline int alarmtimer_callback_running(struct alarm *timer)
-{
-        return timer->state & ALARMTIMER_STATE_CALLBACK;
-}
-
-
 /* Provide way to access the rtc device being used by alarmtimers */
 struct rtc_device *alarmtimer_get_rtcdev(void);
 
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index fbe89e17124e..4dceaf8ae152 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -319,22 +319,6 @@ static inline void __clocksource_updatefreq_khz(struct clocksource *cs, u32 khz)
         __clocksource_updatefreq_scale(cs, 1000, khz);
 }
 
-#ifdef CONFIG_GENERIC_TIME_VSYSCALL
-extern void
-update_vsyscall(struct timespec *ts, struct timespec *wtm,
-                        struct clocksource *c, u32 mult);
-extern void update_vsyscall_tz(void);
-#else
-static inline void
-update_vsyscall(struct timespec *ts, struct timespec *wtm,
-                        struct clocksource *c, u32 mult)
-{
-}
-
-static inline void update_vsyscall_tz(void)
-{
-}
-#endif
 
 extern void timekeeping_notify(struct clocksource *clock);
 
diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h
index 05e3c2c7a8cf..6b87413da9d6 100644
--- a/include/linux/jiffies.h
+++ b/include/linux/jiffies.h
@@ -51,31 +51,17 @@
 #define SH_DIV(NOM,DEN,LSH) (   (((NOM) / (DEN)) << (LSH))              \
                              + ((((NOM) % (DEN)) << (LSH)) + (DEN) / 2) / (DEN))
 
-#ifdef CLOCK_TICK_RATE
 /* LATCH is used in the interval timer and ftape setup. */
-# define LATCH ((CLOCK_TICK_RATE + HZ/2) / HZ)  /* For divider */
+#define LATCH ((CLOCK_TICK_RATE + HZ/2) / HZ)   /* For divider */
 
-/*
- * HZ is the requested value. However the CLOCK_TICK_RATE may not allow
- * for exactly HZ. So SHIFTED_HZ is high res HZ ("<< 8" is for accuracy)
- */
-# define SHIFTED_HZ (SH_DIV(CLOCK_TICK_RATE, LATCH, 8))
-#else
-# define SHIFTED_HZ (HZ << 8)
-#endif
+extern int register_refined_jiffies(long clock_tick_rate);
 
 /* TICK_NSEC is the time between ticks in nsec assuming SHIFTED_HZ */
-#define TICK_NSEC (SH_DIV(1000000UL * 1000, SHIFTED_HZ, 8))
+#define TICK_NSEC ((NSEC_PER_SEC+HZ/2)/HZ)
 
 /* TICK_USEC is the time between ticks in usec assuming fake USER_HZ */
 #define TICK_USEC ((1000000UL + USER_HZ/2) / USER_HZ)
 
-/*
- * TICK_USEC_TO_NSEC is the time between ticks in nsec assuming SHIFTED_HZ and
- * a value TUSEC for TICK_USEC (can be set bij adjtimex)
- */
-#define TICK_USEC_TO_NSEC(TUSEC) (SH_DIV(TUSEC * USER_HZ * 1000, SHIFTED_HZ, 8))
-
 /* some arch's have a small-data section that can be accessed register-relative
  * but that can only take up to, say, 4-byte variables. jiffies being part of
  * an 8-byte variable may not be correctly accessed unless we force the issue
diff --git a/include/linux/timekeeper_internal.h b/include/linux/timekeeper_internal.h
new file mode 100644
index 000000000000..e1d558e237ec
--- /dev/null
+++ b/include/linux/timekeeper_internal.h
@@ -0,0 +1,108 @@
+/*
+ * You SHOULD NOT be including this unless you're vsyscall
+ * handling code or timekeeping internal code!
+ */
+
+#ifndef _LINUX_TIMEKEEPER_INTERNAL_H
+#define _LINUX_TIMEKEEPER_INTERNAL_H
+
+#include <linux/clocksource.h>
+#include <linux/jiffies.h>
+#include <linux/time.h>
+
+/* Structure holding internal timekeeping values. */
+struct timekeeper {
+        /* Current clocksource used for timekeeping. */
+        struct clocksource      *clock;
+        /* NTP adjusted clock multiplier */
+        u32                     mult;
+        /* The shift value of the current clocksource. */
+        u32                     shift;
+        /* Number of clock cycles in one NTP interval. */
+        cycle_t                 cycle_interval;
+        /* Number of clock shifted nano seconds in one NTP interval. */
+        u64                     xtime_interval;
+        /* shifted nano seconds left over when rounding cycle_interval */
+        s64                     xtime_remainder;
+        /* Raw nano seconds accumulated per NTP interval. */
+        u32                     raw_interval;
+
+        /* Current CLOCK_REALTIME time in seconds */
+        u64                     xtime_sec;
+        /* Clock shifted nano seconds */
+        u64                     xtime_nsec;
+
+        /* Difference between accumulated time and NTP time in ntp
+         * shifted nano seconds. */
+        s64                     ntp_error;
+        /* Shift conversion between clock shifted nano seconds and
+         * ntp shifted nano seconds. */
+        u32                     ntp_error_shift;
+
+        /*
+         * wall_to_monotonic is what we need to add to xtime (or xtime corrected
+         * for sub jiffie times) to get to monotonic time.  Monotonic is pegged
+         * at zero at system boot time, so wall_to_monotonic will be negative,
+         * however, we will ALWAYS keep the tv_nsec part positive so we can use
+         * the usual normalization.
+         *
+         * wall_to_monotonic is moved after resume from suspend for the
+         * monotonic time not to jump. We need to add total_sleep_time to
+         * wall_to_monotonic to get the real boot based time offset.
+         *
+         * - wall_to_monotonic is no longer the boot time, getboottime must be
+         * used instead.
+         */
+        struct timespec         wall_to_monotonic;
+        /* Offset clock monotonic -> clock realtime */
+        ktime_t                 offs_real;
+        /* time spent in suspend */
+        struct timespec         total_sleep_time;
+        /* Offset clock monotonic -> clock boottime */
+        ktime_t                 offs_boot;
+        /* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */
+        struct timespec         raw_time;
+        /* Seqlock for all timekeeper values */
+        seqlock_t               lock;
+};
+
+static inline struct timespec tk_xtime(struct timekeeper *tk)
+{
+        struct timespec ts;
+
+        ts.tv_sec = tk->xtime_sec;
+        ts.tv_nsec = (long)(tk->xtime_nsec >> tk->shift);
+        return ts;
+}
+
+
+#ifdef CONFIG_GENERIC_TIME_VSYSCALL
+
+extern void update_vsyscall(struct timekeeper *tk);
+extern void update_vsyscall_tz(void);
+
+#elif defined(CONFIG_GENERIC_TIME_VSYSCALL_OLD)
+
+extern void update_vsyscall_old(struct timespec *ts, struct timespec *wtm,
+                                struct clocksource *c, u32 mult);
+extern void update_vsyscall_tz(void);
+
+static inline void update_vsyscall(struct timekeeper *tk)
+{
+        struct timespec xt;
+
+        xt = tk_xtime(tk);
+        update_vsyscall_old(&xt, &tk->wall_to_monotonic, tk->clock, tk->mult);
+}
+
+#else
+
+static inline void update_vsyscall(struct timekeeper *tk)
+{
+}
+static inline void update_vsyscall_tz(void)
+{
+}
+#endif
+
+#endif /* _LINUX_TIMEKEEPER_INTERNAL_H */