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

Pull timer fixes from Thomas Gleixner:
 "A small set of fixes for time(r) related issues:

   - Fix a long standing conversion issue in jiffies_to_msecs() for odd
     HZ values like 1024 or 1200 which resulted in returning 0 for small
     jiffies values due to rounding down.

   - Use the proper CONFIG symbol in the new Y2038 safe compat code for
     posix-timers. Not yet a visible breakage, but this will immediately
     trigger when the architecture support for the new interfaces is
     merged.

   - Return an error code in the STM32 clocksource driver on failure
     instead of success.

   - Remove the redundant and stale irq disabled check in the posix cpu
     timer code. The check is at the wrong place anyway and lockdep
     already covers it via the sighand lock locking coverage"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  time: Make sure jiffies_to_msecs() preserves non-zero time periods
  posix-timers: Fix nanosleep_copyout() for CONFIG_COMPAT_32BIT_TIME
  clocksource/drivers/stm32: Fix error return code
  posix-cpu-timers: Remove lockdep_assert_irqs_disabled()

Author: torvalds

drivers/clocksource/timer-stm32.c

@@ -304,8 +304,10 @@ static int __init stm32_timer_init(struct device_node *node)
 
 	to->private_data = kzalloc(sizeof(struct stm32_timer_private),
 				   GFP_KERNEL);
-	if (!to->private_data)
+	if (!to->private_data) {
+		ret = -ENOMEM;
 		goto deinit;
+	}
 
 	rstc = of_reset_control_get(node, NULL);
 	if (!IS_ERR(rstc)) {

kernel/time/hrtimer.c

@@ -1659,7 +1659,7 @@ EXPORT_SYMBOL_GPL(hrtimer_init_sleeper);
 int nanosleep_copyout(struct restart_block *restart, struct timespec64 *ts)
 {
 	switch(restart->nanosleep.type) {
-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_COMPAT_32BIT_TIME
 	case TT_COMPAT:
 		if (compat_put_timespec64(ts, restart->nanosleep.compat_rmtp))
 			return -EFAULT;

kernel/time/posix-cpu-timers.c

@@ -604,7 +604,6 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags,
 	/*
 	 * Disarm any old timer after extracting its expiry time.
 	 */
-	lockdep_assert_irqs_disabled();
 
 	ret = 0;
 	old_incr = timer->it.cpu.incr;
@@ -1049,7 +1048,6 @@ static void posix_cpu_timer_rearm(struct k_itimer *timer)
 	/*
 	 * Now re-arm for the new expiry time.
 	 */
-	lockdep_assert_irqs_disabled();
 	arm_timer(timer);
 unlock:
 	unlock_task_sighand(p, &flags);

kernel/time/time.c

@@ -28,6 +28,7 @@
  */
 
 #include <linux/export.h>
+#include <linux/kernel.h>
 #include <linux/timex.h>
 #include <linux/capability.h>
 #include <linux/timekeeper_internal.h>
@@ -314,9 +315,10 @@ unsigned int jiffies_to_msecs(const unsigned long j)
 	return (j + (HZ / MSEC_PER_SEC) - 1)/(HZ / MSEC_PER_SEC);
 #else
 # if BITS_PER_LONG == 32
-	return (HZ_TO_MSEC_MUL32 * j) >> HZ_TO_MSEC_SHR32;
+	return (HZ_TO_MSEC_MUL32 * j + (1ULL << HZ_TO_MSEC_SHR32) - 1) >>
+	       HZ_TO_MSEC_SHR32;
 # else
-	return (j * HZ_TO_MSEC_NUM) / HZ_TO_MSEC_DEN;
+	return DIV_ROUND_UP(j * HZ_TO_MSEC_NUM, HZ_TO_MSEC_DEN);
 # endif
 #endif
 }