sched: Rename a misleading variable in build_overlap_sched_groups()

The child variable in build_overlap_sched_groups() actually refers to the
peer or sibling domain of the given CPU. Rename it to sibling to be consistent
with the naming in build_group_mask().

Signed-off-by: Zhihui Zhang <zzhsuny@gmail.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1406942283-18249-1-git-send-email-zzhsuny@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

kernel/sched/core.c

@@ -5739,7 +5739,7 @@ build_overlap_sched_groups(struct sched_domain *sd, int cpu)
 	const struct cpumask *span = sched_domain_span(sd);
 	struct cpumask *covered = sched_domains_tmpmask;
 	struct sd_data *sdd = sd->private;
-	struct sched_domain *child;
+	struct sched_domain *sibling;
 	int i;
 
 	cpumask_clear(covered);
@@ -5750,10 +5750,10 @@ build_overlap_sched_groups(struct sched_domain *sd, int cpu)
 		if (cpumask_test_cpu(i, covered))
 			continue;
 
-		child = *per_cpu_ptr(sdd->sd, i);
+		sibling = *per_cpu_ptr(sdd->sd, i);
 
 		/* See the comment near build_group_mask(). */
-		if (!cpumask_test_cpu(i, sched_domain_span(child)))
+		if (!cpumask_test_cpu(i, sched_domain_span(sibling)))
 			continue;
 
 		sg = kzalloc_node(sizeof(struct sched_group) + cpumask_size(),
@@ -5763,10 +5763,9 @@ build_overlap_sched_groups(struct sched_domain *sd, int cpu)
 			goto fail;
 
 		sg_span = sched_group_cpus(sg);
-		if (child->child) {
-			child = child->child;
-			cpumask_copy(sg_span, sched_domain_span(child));
-		} else
+		if (sibling->child)
+			cpumask_copy(sg_span, sched_domain_span(sibling->child));
+		else
 			cpumask_set_cpu(i, sg_span);
 
 		cpumask_or(covered, covered, sg_span);