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HMP: Check the system has little cpus before forcing rt tasks onto them

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It is sometimes desirable to run a kernel with HMP scheduling enabled
on a system which is not big.LITTLE, e.g. when building a multi-platform
kernel, or when testing a big.LITTLE system with one cluster disabled.

We should therefore allow for the situation where is no little domain.

Signed-off-by: Jon Medhurst <tixy@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Jon Medhurst (Tixy)
2013-08-02 18:45:33 +01:00
committed by Jon Medhurst
parent 4ab2679351
commit 0d5ddd14a8
1 changed files with 3 additions and 2 deletions
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5
kernel/sched/core.c
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@@ -3841,8 +3841,9 @@ __setscheduler(struct rq *rq, struct task_struct *p, int policy, int prio)
if (rt_prio(p->prio)) {
p->sched_class = &rt_sched_class;
#ifdef CONFIG_SCHED_HMP
if (cpumask_equal(&p->cpus_allowed, cpu_all_mask))
do_set_cpus_allowed(p, &hmp_slow_cpu_mask);
if (!cpumask_empty(&hmp_slow_cpu_mask))
if (cpumask_equal(&p->cpus_allowed, cpu_all_mask))
do_set_cpus_allowed(p, &hmp_slow_cpu_mask);
#endif
}
else