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

Pull timer updates from Thomas Gleixner:
 "A rather largish update for everything time and timer related:

   - Cache footprint optimizations for both hrtimers and timer wheel

   - Lower the NOHZ impact on systems which have NOHZ or timer migration
     disabled at runtime.

   - Optimize run time overhead of hrtimer interrupt by making the clock
     offset updates smarter

   - hrtimer cleanups and removal of restrictions to tackle some
     problems in sched/perf

   - Some more leap second tweaks

   - Another round of changes addressing the 2038 problem

   - First step to change the internals of clock event devices by
     introducing the necessary infrastructure

   - Allow constant folding for usecs/msecs_to_jiffies()

   - The usual pile of clockevent/clocksource driver updates

  The hrtimer changes contain updates to sched, perf and x86 as they
  depend on them plus changes all over the tree to cleanup API changes
  and redundant code, which got copied all over the place.  The y2038
  changes touch s390 to remove the last non 2038 safe code related to
  boot/persistant clock"

* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (114 commits)
  clocksource: Increase dependencies of timer-stm32 to limit build wreckage
  timer: Minimize nohz off overhead
  timer: Reduce timer migration overhead if disabled
  timer: Stats: Simplify the flags handling
  timer: Replace timer base by a cpu index
  timer: Use hlist for the timer wheel hash buckets
  timer: Remove FIFO "guarantee"
  timers: Sanitize catchup_timer_jiffies() usage
  hrtimer: Allow hrtimer::function() to free the timer
  seqcount: Introduce raw_write_seqcount_barrier()
  seqcount: Rename write_seqcount_barrier()
  hrtimer: Fix hrtimer_is_queued() hole
  hrtimer: Remove HRTIMER_STATE_MIGRATE
  selftest: Timers: Avoid signal deadlock in leap-a-day
  timekeeping: Copy the shadow-timekeeper over the real timekeeper last
  clockevents: Check state instead of mode in suspend/resume path
  selftests: timers: Add leap-second timer edge testing to leap-a-day.c
  ntp: Do leapsecond adjustment in adjtimex read path
  time: Prevent early expiry of hrtimers[CLOCK_REALTIME] at the leap second edge
  ntp: Introduce and use SECS_PER_DAY macro instead of 86400
  ...

1 files changed, 9 insertions, 9 deletions

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 32664347091a..013485fb2b06 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1375,9 +1375,9 @@ static void rcu_prepare_kthreads(int cpu)
  * Because we not have RCU_FAST_NO_HZ, just check whether this CPU needs
  * any flavor of RCU.
  */
-int rcu_needs_cpu(unsigned long *delta_jiffies)
+int rcu_needs_cpu(u64 basemono, u64 *nextevt)
 {
-        *delta_jiffies = ULONG_MAX;
+        *nextevt = KTIME_MAX;
         return IS_ENABLED(CONFIG_RCU_NOCB_CPU_ALL)
                ? 0 : rcu_cpu_has_callbacks(NULL);
 }
@@ -1439,8 +1439,6 @@ module_param(rcu_idle_gp_delay, int, 0644);
 static int rcu_idle_lazy_gp_delay = RCU_IDLE_LAZY_GP_DELAY;
 module_param(rcu_idle_lazy_gp_delay, int, 0644);
 
-extern int tick_nohz_active;
-
 /*
  * Try to advance callbacks for all flavors of RCU on the current CPU, but
  * only if it has been awhile since the last time we did so.  Afterwards,
@@ -1487,12 +1485,13 @@ static bool __maybe_unused rcu_try_advance_all_cbs(void)
  *
  * The caller must have disabled interrupts.
  */
-int rcu_needs_cpu(unsigned long *dj)
+int rcu_needs_cpu(u64 basemono, u64 *nextevt)
 {
         struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks);
+        unsigned long dj;
 
         if (IS_ENABLED(CONFIG_RCU_NOCB_CPU_ALL)) {
-                *dj = ULONG_MAX;
+                *nextevt = KTIME_MAX;
                 return 0;
         }
 
@@ -1501,7 +1500,7 @@ int rcu_needs_cpu(unsigned long *dj)
 
         /* If no callbacks, RCU doesn't need the CPU. */
         if (!rcu_cpu_has_callbacks(&rdtp->all_lazy)) {
-                *dj = ULONG_MAX;
+                *nextevt = KTIME_MAX;
                 return 0;
         }
 
@@ -1515,11 +1514,12 @@ int rcu_needs_cpu(unsigned long *dj)
 
         /* Request timer delay depending on laziness, and round. */
         if (!rdtp->all_lazy) {
-                *dj = round_up(rcu_idle_gp_delay + jiffies,
+                dj = round_up(rcu_idle_gp_delay + jiffies,
                                rcu_idle_gp_delay) - jiffies;
         } else {
-                *dj = round_jiffies(rcu_idle_lazy_gp_delay + jiffies) - jiffies;
+                dj = round_jiffies(rcu_idle_lazy_gp_delay + jiffies) - jiffies;
         }
+        *nextevt = basemono + dj * TICK_NSEC;
         return 0;
 }