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

Pull core timer updates from Ingo Molnar:
 "The main changes in this cycle's merge are:

   - Implement shadow timekeeper to shorten in kernel reader side
     blocking, by Thomas Gleixner.

   - Posix timers enhancements by Pavel Emelyanov:

   - allocate timer ID per process, so that exact timer ID allocations
     can be re-created be checkpoint/restore code.

   - debuggability and tooling (/proc/PID/timers, etc.) improvements.

   - suspend/resume enhancements by Feng Tang: on certain new Intel Atom
     processors (Penwell and Cloverview), there is a feature that the
     TSC won't stop in S3 state, so the TSC value won't be reset to 0
     after resume.  This can be taken advantage of by the generic via
     the CLOCK_SOURCE_SUSPEND_NONSTOP flag: instead of using the RTC to
     recover/approximate sleep time, the main (and precise) clocksource
     can be used.

   - Fix /proc/timer_list for 4096 CPUs by Nathan Zimmer: on so many
     CPUs the file goes beyond 4MB of size and thus the current
     simplistic seqfile approach fails.  Convert /proc/timer_list to a
     proper seq_file with its own iterator.

   - Cleanups and refactorings of the core timekeeping code by John
     Stultz.

   - International Atomic Clock time is managed by the NTP code
     internally currently but not exposed externally.  Separate the TAI
     code out and add CLOCK_TAI support and TAI support to the hrtimer
     and posix-timer code, by John Stultz.

   - Add deep idle support enhacement to the broadcast clockevents core
     timer code, by Daniel Lezcano: add an opt-in CLOCK_EVT_FEAT_DYNIRQ
     clockevents feature (which will be utilized by future clockevents
     driver updates), which allows the use of IRQ affinities to avoid
     spurious wakeups of idle CPUs - the right CPU with an expiring
     timer will be woken.

   - Add new ARM bcm281xx clocksource driver, by Christian Daudt

   - ... various other fixes and cleanups"

* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (52 commits)
  clockevents: Set dummy handler on CPU_DEAD shutdown
  timekeeping: Update tk->cycle_last in resume
  posix-timers: Remove unused variable
  clockevents: Switch into oneshot mode even if broadcast registered late
  timer_list: Convert timer list to be a proper seq_file
  timer_list: Split timer_list_show_tickdevices
  posix-timers: Show sigevent info in proc file
  posix-timers: Introduce /proc/PID/timers file
  posix timers: Allocate timer id per process (v2)
  timekeeping: Make sure to notify hrtimers when TAI offset changes
  hrtimer: Fix ktime_add_ns() overflow on 32bit architectures
  hrtimer: Add expiry time overflow check in hrtimer_interrupt
  timekeeping: Shorten seq_count region
  timekeeping: Implement a shadow timekeeper
  timekeeping: Delay update of clock->cycle_last
  timekeeping: Store cycle_last value in timekeeper struct as well
  ntp: Remove ntp_lock, using the timekeeping locks to protect ntp state
  timekeeping: Simplify tai updating from do_adjtimex
  timekeeping: Hold timekeepering locks in do_adjtimex and hardpps
  timekeeping: Move ADJ_SETOFFSET to top level do_adjtimex()
  ...

10 files changed, 32 insertions, 16 deletions

diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h
index 66346521cb65..464e229e7d84 100644
--- a/include/linux/clockchips.h
+++ b/include/linux/clockchips.h
@@ -55,6 +55,11 @@ enum clock_event_nofitiers {
 #define CLOCK_EVT_FEAT_C3STOP           0x000008
 #define CLOCK_EVT_FEAT_DUMMY            0x000010
 
+/*
+ * Core shall set the interrupt affinity dynamically in broadcast mode
+ */
+#define CLOCK_EVT_FEAT_DYNIRQ           0x000020
+
 /**
  * struct clock_event_device - clock event device descriptor
  * @event_handler:      Assigned by the framework to be called by the low
@@ -170,6 +175,12 @@ extern void tick_broadcast(const struct cpumask *mask);
 extern int tick_receive_broadcast(void);
 #endif
 
+#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
+extern int tick_check_broadcast_expired(void);
+#else
+static inline int tick_check_broadcast_expired(void) { return 0; }
+#endif
+
 #ifdef CONFIG_GENERIC_CLOCKEVENTS
 extern void clockevents_notify(unsigned long reason, void *arg);
 #else
@@ -182,6 +193,7 @@ static inline void clockevents_suspend(void) {}
 static inline void clockevents_resume(void) {}
 
 #define clockevents_notify(reason, arg) do { } while (0)
+static inline int tick_check_broadcast_expired(void) { return 0; }
 
 #endif
 
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 27cfda427dd9..aa7032c7238f 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -206,6 +206,7 @@ struct clocksource {
 #define CLOCK_SOURCE_WATCHDOG                   0x10
 #define CLOCK_SOURCE_VALID_FOR_HRES             0x20
 #define CLOCK_SOURCE_UNSTABLE                   0x40
+#define CLOCK_SOURCE_SUSPEND_NONSTOP            0x80
 
 /* simplify initialization of mask field */
 #define CLOCKSOURCE_MASK(bits) (cycle_t)((bits) < 64 ? ((1ULL<<(bits))-1) : -1)
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index cc07d2777bbe..d19a5c2d2270 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -157,6 +157,7 @@ enum  hrtimer_base_type {
         HRTIMER_BASE_MONOTONIC,
         HRTIMER_BASE_REALTIME,
         HRTIMER_BASE_BOOTTIME,
+        HRTIMER_BASE_TAI,
         HRTIMER_MAX_CLOCK_BASES,
 };
 
@@ -327,7 +328,9 @@ extern ktime_t ktime_get(void);
 extern ktime_t ktime_get_real(void);
 extern ktime_t ktime_get_boottime(void);
 extern ktime_t ktime_get_monotonic_offset(void);
-extern ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot);
+extern ktime_t ktime_get_clocktai(void);
+extern ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot,
+                                         ktime_t *offs_tai);
 
 DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
 
diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h
index 82ed068b1ebe..8fb8edf12417 100644
--- a/include/linux/jiffies.h
+++ b/include/linux/jiffies.h
@@ -75,7 +75,6 @@ extern int register_refined_jiffies(long clock_tick_rate);
  */
 extern u64 __jiffy_data jiffies_64;
 extern unsigned long volatile __jiffy_data jiffies;
-extern seqlock_t jiffies_lock;
 
 #if (BITS_PER_LONG < 64)
 u64 get_jiffies_64(void);
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index 042058fdb0af..60bac697a91b 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -55,6 +55,7 @@ struct cpu_timer_list {
 /* POSIX.1b interval timer structure. */
 struct k_itimer {
         struct list_head list;          /* free/ allocate list */
+        struct hlist_node t_hash;
         spinlock_t it_lock;
         clockid_t it_clock;             /* which timer type */
         timer_t it_id;                  /* timer id */
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 981ab6887259..54ddcb82cddf 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -514,7 +514,8 @@ struct signal_struct {
         unsigned int            has_child_subreaper:1;
 
         /* POSIX.1b Interval Timers */
-        struct list_head posix_timers;
+        int                     posix_timer_id;
+        struct list_head        posix_timers;
 
         /* ITIMER_REAL timer for the process */
         struct hrtimer real_timer;
diff --git a/include/linux/time.h b/include/linux/time.h
index d4835dfdf25e..22d81b3c955b 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -181,6 +181,9 @@ extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
 extern int timekeeping_valid_for_hres(void);
 extern u64 timekeeping_max_deferment(void);
 extern int timekeeping_inject_offset(struct timespec *ts);
+extern s32 timekeeping_get_tai_offset(void);
+extern void timekeeping_set_tai_offset(s32 tai_offset);
+extern void timekeeping_clocktai(struct timespec *ts);
 
 struct tms;
 extern void do_sys_times(struct tms *);
diff --git a/include/linux/timekeeper_internal.h b/include/linux/timekeeper_internal.h
index e1d558e237ec..c1825eb436ed 100644
--- a/include/linux/timekeeper_internal.h
+++ b/include/linux/timekeeper_internal.h
@@ -20,6 +20,8 @@ struct timekeeper {
         u32                     shift;
         /* Number of clock cycles in one NTP interval. */
         cycle_t                 cycle_interval;
+        /* Last cycle value (also stored in clock->cycle_last) */
+        cycle_t                 cycle_last;
         /* Number of clock shifted nano seconds in one NTP interval. */
         u64                     xtime_interval;
         /* shifted nano seconds left over when rounding cycle_interval */
@@ -62,8 +64,11 @@ struct timekeeper {
         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;
+        /* The current UTC to TAI offset in seconds */
+        s32                     tai_offset;
+        /* Offset clock monotonic -> clock tai */
+        ktime_t                 offs_tai;
+
 };
 
 static inline struct timespec tk_xtime(struct timekeeper *tk)
diff --git a/include/linux/timex.h b/include/linux/timex.h
index 5ec87c60b97c..b3726e61368e 100644
--- a/include/linux/timex.h
+++ b/include/linux/timex.h
@@ -125,9 +125,6 @@
 extern unsigned long tick_usec;         /* USER_HZ period (usec) */
 extern unsigned long tick_nsec;         /* SHIFTED_HZ period (nsec) */
 
-extern void ntp_init(void);
-extern void ntp_clear(void);
-
 /* Required to safely shift negative values */
 #define shift_right(x, s) ({    \
         __typeof__(x) __x = (x);        \
@@ -140,10 +137,6 @@ extern void ntp_clear(void);
 #define NTP_INTERVAL_FREQ  (HZ)
 #define NTP_INTERVAL_LENGTH (NSEC_PER_SEC/NTP_INTERVAL_FREQ)
 
-/* Returns how long ticks are at present, in ns / 2^NTP_SCALE_SHIFT. */
-extern u64 ntp_tick_length(void);
-
-extern int second_overflow(unsigned long secs);
 extern int do_adjtimex(struct timex *);
 extern void hardpps(const struct timespec *, const struct timespec *);
 
diff --git a/include/uapi/linux/time.h b/include/uapi/linux/time.h
index 0d3c0edc3eda..e75e1b6ff27f 100644
--- a/include/uapi/linux/time.h
+++ b/include/uapi/linux/time.h
@@ -54,11 +54,9 @@ struct itimerval {
 #define CLOCK_BOOTTIME                  7
 #define CLOCK_REALTIME_ALARM            8
 #define CLOCK_BOOTTIME_ALARM            9
+#define CLOCK_SGI_CYCLE                 10      /* Hardware specific */
+#define CLOCK_TAI                       11
 
-/*
- * The IDs of various hardware clocks:
- */
-#define CLOCK_SGI_CYCLE                 10
 #define MAX_CLOCKS                      16
 #define CLOCKS_MASK                     (CLOCK_REALTIME | CLOCK_MONOTONIC)
 #define CLOCKS_MONO                     CLOCK_MONOTONIC