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

Pull timer fix from Thomas Gleixner:
 "A single fix for a ~10 years old problem which causes high resolution
  timers to stop after a CPU unplug/plug cycle due to a stale flag in
  the per CPU hrtimer base struct.

  Paul McKenney was hunting this for about a year, but the heisenbug
  nature made it resistant against debug attempts for quite some time"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  hrtimer: Reset hrtimer cpu base proper on CPU hotplug
This commit is contained in:
Linus Torvalds 2018-01-28 12:17:35 -08:00
parent 624441927f d5421ea43d
commit 07b0137c02
1 changed files with 3 additions and 0 deletions
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3
kernel/time/hrtimer.c
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@ -655,7 +655,9 @@ static void hrtimer_reprogram(struct hrtimer *timer,
static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base)
{
base->expires_next = KTIME_MAX;
base->hang_detected = 0;
base->hres_active = 0;
base->next_timer = NULL;
}
/*
@ -1589,6 +1591,7 @@ int hrtimers_prepare_cpu(unsigned int cpu)
timerqueue_init_head(&cpu_base->clock_base[i].active);
}
cpu_base->active_bases = 0;
cpu_base->cpu = cpu;
hrtimer_init_hres(cpu_base);
return 0;