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

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Pull scheduler fix from Ingo Molnar:
 "Fix a division by zero bug that can trigger in the NUMA placement
  code"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/numa: Fix a possible divide-by-zero
This commit is contained in:
Linus Torvalds 2019-04-27 10:18:40 -07:00
commit 15d4e26b81
1 changed files with 4 additions and 0 deletions
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4
kernel/sched/fair.c
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@ -2007,6 +2007,10 @@ static u64 numa_get_avg_runtime(struct task_struct *p, u64 *period)
if (p->last_task_numa_placement) {
delta = runtime - p->last_sum_exec_runtime;
*period = now - p->last_task_numa_placement;
/* Avoid time going backwards, prevent potential divide error: */
if (unlikely((s64)*period < 0))
*period = 0;
} else {
delta = p->se.avg.load_sum;
*period = LOAD_AVG_MAX;