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ARM64: sched: fix bug: avoid infinite loop

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All of the sched domains will be destroied and then rebuilded when a cpu
online/offline, if a softirq comes after the shced domains are destroied,
this cpu will be stucked in the infinite loop in sched_group_energy(),
because of it can not get the shced donmain in for_each_domain(cpu, sd).

Change-Id: I154cf560e4e1af4a7a2547154ad321e936196ce3
Signed-off-by: Chen Liang <cl@rock-chips.com>
This commit is contained in:
Chen Liang
2016-07-08 10:12:43 +08:00
parent ec801e81f6
commit d4773e1407
1 changed files with 7 additions and 2 deletions
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9
kernel/sched/fair.c
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@@ -4866,6 +4866,7 @@ static int sched_group_energy(struct energy_env *eenv)
struct sched_group *sg_shared_cap = NULL;
cpu = cpumask_first(&visit_cpus);
cpumask_clear_cpu(cpu, &visit_cpus);
/*
* Is the group utilization affected by cpus outside this
@@ -4928,8 +4929,12 @@ static int sched_group_energy(struct energy_env *eenv)
total_energy += sg_busy_energy + sg_idle_energy;
if (!sd->child)
cpumask_xor(&visit_cpus, &visit_cpus, sched_group_cpus(sg));
if (!sd->child) {
int i;
for_each_cpu(i, sched_group_cpus(sg))
cpumask_clear_cpu(i, &visit_cpus);
}
if (cpumask_equal(sched_group_cpus(sg), sched_group_cpus(eenv->sg_top)))
goto next_cpu;