Merge tag 'timers-core-2023-06-26' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull timer updates from Thomas Gleixner:
 "Time, timekeeping and related device driver updates:

  Core:

   - A set of fixes, cleanups and enhancements to the posix timer code:

       - Prevent another possible live lock scenario in the exit() path,
         which affects POSIX_CPU_TIMERS_TASK_WORK enabled architectures.

       - Fix a loop termination issue which was reported syzcaller/KSAN
         in the posix timer ID allocation code.

         That triggered a deeper look into the posix-timer code which
         unearthed more small issues.

       - Add missing READ/WRITE_ONCE() annotations

       - Fix or remove completely outdated comments

       - Document places which are subtle and completely undocumented.

   - Add missing hrtimer modes to the trace event decoder

   - Small cleanups and enhancements all over the place

  Drivers:

   - Rework the Hyper-V clocksource and sched clock setup code

   - Remove a deprecated clocksource driver

   - Small fixes and enhancements all over the place"

* tag 'timers-core-2023-06-26' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tip/tip: (39 commits)
  clocksource/drivers/cadence-ttc: Fix memory leak in ttc_timer_probe
  dt-bindings: timers: Add Ralink SoCs timer
  clocksource/drivers/hyper-v: Rework clocksource and sched clock setup
  dt-bindings: timer: brcm,kona-timer: convert to YAML
  clocksource/drivers/imx-gpt: Fold <soc/imx/timer.h> into its only user
  clk: imx: Drop inclusion of unused header <soc/imx/timer.h>
  hrtimer: Add missing sparse annotations to hrtimer locking
  clocksource/drivers/imx-gpt: Use only a single name for functions
  clocksource/drivers/loongson1: Move PWM timer to clocksource framework
  dt-bindings: timer: Add Loongson-1 clocksource
  MIPS: Loongson32: Remove deprecated PWM timer clocksource
  clocksource/drivers/ingenic-timer: Use pm_sleep_ptr() macro
  tracing/timer: Add missing hrtimer modes to decode_hrtimer_mode().
  posix-timers: Add sys_ni_posix_timers() prototype
  tick/rcu: Fix bogus ratelimit condition
  alarmtimer: Remove unnecessary (void *) cast
  alarmtimer: Remove unnecessary initialization of variable 'ret'
  posix-timers: Refer properly to CONFIG_HIGH_RES_TIMERS
  posix-timers: Polish coding style in a few places
  posix-timers: Remove pointless comments
  ...

kernel/time/alarmtimer.c

@@ -751,7 +751,7 @@ static int alarm_timer_create(struct k_itimer *new_timer)
 static enum alarmtimer_restart alarmtimer_nsleep_wakeup(struct alarm *alarm,
 								ktime_t now)
 {
-	struct task_struct *task = (struct task_struct *)alarm->data;
+	struct task_struct *task = alarm->data;
 
 	alarm->data = NULL;
 	if (task)
@@ -847,7 +847,7 @@ static int alarm_timer_nsleep(const clockid_t which_clock, int flags,
 	struct restart_block *restart = &current->restart_block;
 	struct alarm alarm;
 	ktime_t exp;
-	int ret = 0;
+	int ret;
 
 	if (!alarmtimer_get_rtcdev())
 		return -EOPNOTSUPP;

kernel/time/hrtimer.c

@@ -164,6 +164,7 @@ static inline bool is_migration_base(struct hrtimer_clock_base *base)
 static
 struct hrtimer_clock_base *lock_hrtimer_base(const struct hrtimer *timer,
 					     unsigned long *flags)
+	__acquires(&timer->base->lock)
 {
 	struct hrtimer_clock_base *base;
 
@@ -280,6 +281,7 @@ static inline bool is_migration_base(struct hrtimer_clock_base *base)
 
 static inline struct hrtimer_clock_base *
 lock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
+	__acquires(&timer->base->cpu_base->lock)
 {
 	struct hrtimer_clock_base *base = timer->base;
 
@@ -1013,6 +1015,7 @@ void hrtimers_resume_local(void)
  */
 static inline
 void unlock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
+	__releases(&timer->base->cpu_base->lock)
 {
 	raw_spin_unlock_irqrestore(&timer->base->cpu_base->lock, *flags);
 }

kernel/time/tick-sched.c

@@ -1041,7 +1041,7 @@ static bool report_idle_softirq(void)
 			return false;
 	}
 
-	if (ratelimit < 10)
+	if (ratelimit >= 10)
 		return false;
 
 	/* On RT, softirqs handling may be waiting on some lock */