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authorJon Medhurst <tixy@linaro.org>2012-10-12 13:45:35 +0100
committerViresh Kumar <viresh.kumar@linaro.org>2013-03-12 14:54:43 +0530
commit1a574871bfd002f4d7c7bcf004fd9835de9cea63 (patch)
tree281f30e8ef0a43a8131317ce260b3ec04e3a330e
parentb193b65dd36c95059cbd04d391c58ff4582db146 (diff)
downloadlinux-linaro-stable-1a574871bfd002f4d7c7bcf004fd9835de9cea63.tar.gz
ARM: sched: Avoid empty 'slow' HMP domain
On homogeneous (non-heterogeneous) systems all CPUs will be declared 'fast' and the slow cpu list will be empty. In this situation we need to avoid adding an empty slow HMP domain otherwise the scheduler code will blow up when it attempts to move a task to the slow domain. Signed-off-by: Jon Medhurst <tixy@linaro.org>
-rw-r--r--arch/arm/kernel/topology.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
index 04271db020c6..f487129ab7fd 100644
--- a/arch/arm/kernel/topology.c
+++ b/arch/arm/kernel/topology.c
@@ -366,10 +366,12 @@ void __init arch_get_hmp_domains(struct list_head *hmp_domains_list)
* Must be ordered with respect to compute capacity.
* Fastest domain at head of list.
*/
- domain = (struct hmp_domain *)
- kmalloc(sizeof(struct hmp_domain), GFP_KERNEL);
- cpumask_copy(&domain->cpus, &hmp_slow_cpu_mask);
- list_add(&domain->hmp_domains, hmp_domains_list);
+ if(!cpumask_empty(&hmp_slow_cpu_mask)) {
+ domain = (struct hmp_domain *)
+ kmalloc(sizeof(struct hmp_domain), GFP_KERNEL);
+ cpumask_copy(&domain->cpus, &hmp_slow_cpu_mask);
+ list_add(&domain->hmp_domains, hmp_domains_list);
+ }
domain = (struct hmp_domain *)
kmalloc(sizeof(struct hmp_domain), GFP_KERNEL);
cpumask_copy(&domain->cpus, &hmp_fast_cpu_mask);