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Diffstat (limited to 'kernel/sched/topology.c')
-rw-r--r--kernel/sched/topology.c39
1 files changed, 23 insertions, 16 deletions
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 79895aec281e..6f7b43982f73 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -261,8 +261,6 @@ void rq_attach_root(struct rq *rq, struct root_domain *rd)
static int init_rootdomain(struct root_domain *rd)
{
- memset(rd, 0, sizeof(*rd));
-
if (!zalloc_cpumask_var(&rd->span, GFP_KERNEL))
goto out;
if (!zalloc_cpumask_var(&rd->online, GFP_KERNEL))
@@ -311,7 +309,7 @@ static struct root_domain *alloc_rootdomain(void)
{
struct root_domain *rd;
- rd = kmalloc(sizeof(*rd), GFP_KERNEL);
+ rd = kzalloc(sizeof(*rd), GFP_KERNEL);
if (!rd)
return NULL;
@@ -337,7 +335,8 @@ static void free_sched_groups(struct sched_group *sg, int free_sgc)
if (free_sgc && atomic_dec_and_test(&sg->sgc->ref))
kfree(sg->sgc);
- kfree(sg);
+ if (atomic_dec_and_test(&sg->ref))
+ kfree(sg);
sg = tmp;
} while (sg != first);
}
@@ -345,15 +344,12 @@ static void free_sched_groups(struct sched_group *sg, int free_sgc)
static void destroy_sched_domain(struct sched_domain *sd)
{
/*
- * If its an overlapping domain it has private groups, iterate and
- * nuke them all.
+ * A normal sched domain may have multiple group references, an
+ * overlapping domain, having private groups, only one. Iterate,
+ * dropping group/capacity references, freeing where none remain.
*/
- if (sd->flags & SD_OVERLAP) {
- free_sched_groups(sd->groups, 1);
- } else if (atomic_dec_and_test(&sd->groups->ref)) {
- kfree(sd->groups->sgc);
- kfree(sd->groups);
- }
+ free_sched_groups(sd->groups, 1);
+
if (sd->shared && atomic_dec_and_test(&sd->shared->ref))
kfree(sd->shared);
kfree(sd);
@@ -463,6 +459,7 @@ cpu_attach_domain(struct sched_domain *sd, struct root_domain *rd, int cpu)
rq_attach_root(rq, rd);
tmp = rq->sd;
rcu_assign_pointer(rq->sd, sd);
+ dirty_sched_domain_sysctl(cpu);
destroy_sched_domains(tmp);
update_top_cache_domain(cpu);
@@ -670,6 +667,7 @@ build_group_from_child_sched_domain(struct sched_domain *sd, int cpu)
else
cpumask_copy(sg_span, sched_domain_span(sd));
+ atomic_inc(&sg->ref);
return sg;
}
@@ -1595,7 +1593,7 @@ static void __sdt_free(const struct cpumask *cpu_map)
}
}
-struct sched_domain *build_sched_domain(struct sched_domain_topology_level *tl,
+static struct sched_domain *build_sched_domain(struct sched_domain_topology_level *tl,
const struct cpumask *cpu_map, struct sched_domain_attr *attr,
struct sched_domain *child, int cpu)
{
@@ -1854,7 +1852,17 @@ void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
/* Let the architecture update CPU core mappings: */
new_topology = arch_update_cpu_topology();
- n = doms_new ? ndoms_new : 0;
+ if (!doms_new) {
+ WARN_ON_ONCE(dattr_new);
+ n = 0;
+ doms_new = alloc_sched_domains(1);
+ if (doms_new) {
+ n = 1;
+ cpumask_andnot(doms_new[0], cpu_active_mask, cpu_isolated_map);
+ }
+ } else {
+ n = ndoms_new;
+ }
/* Destroy deleted domains: */
for (i = 0; i < ndoms_cur; i++) {
@@ -1870,11 +1878,10 @@ match1:
}
n = ndoms_cur;
- if (doms_new == NULL) {
+ if (!doms_new) {
n = 0;
doms_new = &fallback_doms;
cpumask_andnot(doms_new[0], cpu_active_mask, cpu_isolated_map);
- WARN_ON_ONCE(dattr_new);
}
/* Build new domains: */