Merge tag 'timers-urgent-2025-07-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull timer fix from Thomas Gleixner:
 "A single fix for the PTP systemcounter mechanism:

  The rework of this mechanism added a 'use_nsec' member to struct
  system_counterval. get_device_system_crosststamp() instantiates that
  struct on the stack and hands a pointer to the driver callback.

  Only the drivers which set use_nsec to true, initialize that field,
  but all others ignore it. As get_device_system_crosststamp() does not
  initialize the struct, the use_nsec field contains random stack
  content in those cases. That causes a miscalulation usually resulting
  in a failing range check in the best case.

  Initialize the structure before handing it to the drivers to cure
  that"

* tag 'timers-urgent-2025-07-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  timekeeping: Zero initialize system_counterval when querying time from phc drivers

Author: torvalds

kernel/time/timekeeping.c

@@ -1256,7 +1256,7 @@ int get_device_system_crosststamp(int (*get_time_fn)
 				  struct system_time_snapshot *history_begin,
 				  struct system_device_crosststamp *xtstamp)
 {
-	struct system_counterval_t system_counterval;
+	struct system_counterval_t system_counterval = {};
 	struct timekeeper *tk = &tk_core.timekeeper;
 	u64 cycles, now, interval_start;
 	unsigned int clock_was_set_seq = 0;