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authorLinus Torvalds <torvalds@linux-foundation.org>2018-01-28 21:17:35 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2018-01-28 21:17:35 +0100
commit07b0137c0268b8d0694a5f09284449353a1a6fed (patch)
treed69172d06f3553027ffa7be08e518697b2c58a9f
parentMerge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/k... (diff)
parenthrtimer: Reset hrtimer cpu base proper on CPU hotplug (diff)
downloadlinux-07b0137c0268b8d0694a5f09284449353a1a6fed.tar.xz
linux-07b0137c0268b8d0694a5f09284449353a1a6fed.zip
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
-rw-r--r--kernel/time/hrtimer.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index d32520840fde..aa9d2a2b1210 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -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;