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authorJon Medhurst <tixy@linaro.org>2012-10-12 13:45:35 +0100
committerViresh Kumar <viresh.kumar@linaro.org>2012-10-12 19:49:59 +0530
commit004bd61ea2a665d342ee9cd5ef6e8f396781fe5a (patch)
tree68e0cf04d49799d23c06804b2aa10b08290f261f
parent2e91a21772260ab89fc7b30c535233b2641520d8 (diff)
downloadvexpress-lsk-004bd61ea2a665d342ee9cd5ef6e8f396781fe5a.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 ec8ad5c3a5a..be3dae1cfa7 100644
--- a/arch/arm/kernel/topology.c
+++ b/arch/arm/kernel/topology.c
@@ -396,10 +396,12 @@ 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);