Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  kernel/sched.c: add missing forward declaration for 'double_rq_lock'
  sched: partly revert "sched debug: remove NULL checking in print_cfs_rt_rq()"
  cpumask: fix CONFIG_NUMA=y sched.c

2 files changed, 25 insertions, 9 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index deb5ac8c12f3..8be2c13b50d0 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -125,6 +125,9 @@ DEFINE_TRACE(sched_switch);
 DEFINE_TRACE(sched_migrate_task);
 
 #ifdef CONFIG_SMP
+
+static void double_rq_lock(struct rq *rq1, struct rq *rq2);
+
 /*
  * Divide a load by a sched group cpu_power : (load / sg->__cpu_power)
  * Since cpu_power is a 'constant', we can use a reciprocal divide.
@@ -7282,10 +7285,10 @@ cpu_to_phys_group(int cpu, const struct cpumask *cpu_map,
  * groups, so roll our own. Now each node has its own list of groups which
  * gets dynamically allocated.
  */
-static DEFINE_PER_CPU(struct sched_domain, node_domains);
+static DEFINE_PER_CPU(struct static_sched_domain, node_domains);
 static struct sched_group ***sched_group_nodes_bycpu;
 
-static DEFINE_PER_CPU(struct sched_domain, allnodes_domains);
+static DEFINE_PER_CPU(struct static_sched_domain, allnodes_domains);
 static DEFINE_PER_CPU(struct static_sched_group, sched_group_allnodes);
 
 static int cpu_to_allnodes_group(int cpu, const struct cpumask *cpu_map,
@@ -7560,7 +7563,7 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
 #ifdef CONFIG_NUMA
                 if (cpumask_weight(cpu_map) >
                                 SD_NODES_PER_DOMAIN*cpumask_weight(nodemask)) {
-                        sd = &per_cpu(allnodes_domains, i);
+                        sd = &per_cpu(allnodes_domains, i).sd;
                         SD_INIT(sd, ALLNODES);
                         set_domain_attribute(sd, attr);
                         cpumask_copy(sched_domain_span(sd), cpu_map);
@@ -7570,7 +7573,7 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
                 } else
                         p = NULL;
 
-                sd = &per_cpu(node_domains, i);
+                sd = &per_cpu(node_domains, i).sd;
                 SD_INIT(sd, NODE);
                 set_domain_attribute(sd, attr);
                 sched_domain_node_span(cpu_to_node(i), sched_domain_span(sd));
@@ -7688,7 +7691,7 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
                 for_each_cpu(j, nodemask) {
                         struct sched_domain *sd;
 
-                        sd = &per_cpu(node_domains, j);
+                        sd = &per_cpu(node_domains, j).sd;
                         sd->groups = sg;
                 }
                 sg->__cpu_power = 0;
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 4293cfa9681d..16eeba4e4169 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -145,6 +145,19 @@ static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
         read_unlock_irqrestore(&tasklist_lock, flags);
 }
 
+#if defined(CONFIG_CGROUP_SCHED) && \
+        (defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED))
+static void task_group_path(struct task_group *tg, char *buf, int buflen)
+{
+        /* may be NULL if the underlying cgroup isn't fully-created yet */
+        if (!tg->css.cgroup) {
+                buf[0] = '\0';
+                return;
+        }
+        cgroup_path(tg->css.cgroup, buf, buflen);
+}
+#endif
+
 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 {
         s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
@@ -154,10 +167,10 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
         unsigned long flags;
 
 #if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
-        char path[128] = "";
+        char path[128];
         struct task_group *tg = cfs_rq->tg;
 
-        cgroup_path(tg->css.cgroup, path, sizeof(path));
+        task_group_path(tg, path, sizeof(path));
 
         SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, path);
 #elif defined(CONFIG_USER_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
@@ -208,10 +221,10 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
 {
 #if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_RT_GROUP_SCHED)
-        char path[128] = "";
+        char path[128];
         struct task_group *tg = rt_rq->tg;
 
-        cgroup_path(tg->css.cgroup, path, sizeof(path));
+        task_group_path(tg, path, sizeof(path));
 
         SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, path);
 #else