sched: put back some stack hog changes that were undone in kernel/sched.c

Impact: prevents panic from stack overflow on numa-capable machines.

Some of the "removal of stack hogs" changes in kernel/sched.c by using
node_to_cpumask_ptr were undone by the early cpumask API updates, and
causes a panic due to stack overflow.  This patch undoes those changes
by using cpumask_of_node() which returns a 'const struct cpumask *'.

In addition, cpu_coregoup_map is replaced with cpu_coregroup_mask further
reducing stack usage.  (Both of these updates removed 9 FIXME's!)

Also:
   Pick up some remaining changes from the old 'cpumask_t' functions to
   the new 'struct cpumask *' functions.

   Optimize memory traffic by allocating each percpu local_cpu_mask on the
   same node as the referring cpu.

Signed-off-by: Mike Travis <travis@sgi.com>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 17 insertions, 39 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 27ba1d642f0f..dd862d70e715 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3715,7 +3715,7 @@ redo:
                  * don't kick the migration_thread, if the curr
                  * task on busiest cpu can't be moved to this_cpu
                  */
-                if (!cpu_isset(this_cpu, busiest->curr->cpus_allowed)) {
+                if (!cpumask_test_cpu(this_cpu, &busiest->curr->cpus_allowed)) {
                         double_unlock_balance(this_rq, busiest);
                         all_pinned = 1;
                         return ld_moved;
@@ -6220,9 +6220,7 @@ static int __migrate_task_irq(struct task_struct *p, int src_cpu, int dest_cpu)
 static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p)
 {
         int dest_cpu;
-        /* FIXME: Use cpumask_of_node here. */
-        cpumask_t _nodemask = node_to_cpumask(cpu_to_node(dead_cpu));
-        const struct cpumask *nodemask = &_nodemask;
+        const struct cpumask *nodemask = cpumask_of_node(cpu_to_node(dead_cpu));
 
 again:
         /* Look for allowed, online CPU in same node. */
@@ -7133,21 +7131,18 @@ static int find_next_best_node(int node, nodemask_t *used_nodes)
 static void sched_domain_node_span(int node, struct cpumask *span)
 {
         nodemask_t used_nodes;
-        /* FIXME: use cpumask_of_node() */
-        node_to_cpumask_ptr(nodemask, node);
         int i;
 
-        cpus_clear(*span);
+        cpumask_clear(span);
         nodes_clear(used_nodes);
 
-        cpus_or(*span, *span, *nodemask);
+        cpumask_or(span, span, cpumask_of_node(node));
         node_set(node, used_nodes);
 
         for (i = 1; i < SD_NODES_PER_DOMAIN; i++) {
                 int next_node = find_next_best_node(node, &used_nodes);
 
-                node_to_cpumask_ptr_next(nodemask, next_node);
-                cpus_or(*span, *span, *nodemask);
+                cpumask_or(span, span, cpumask_of_node(next_node));
         }
 }
 #endif /* CONFIG_NUMA */
@@ -7227,9 +7222,7 @@ cpu_to_phys_group(int cpu, const struct cpumask *cpu_map,
 {
         int group;
 #ifdef CONFIG_SCHED_MC
-        /* FIXME: Use cpu_coregroup_mask. */
-        *mask = cpu_coregroup_map(cpu);
-        cpus_and(*mask, *mask, *cpu_map);
+        cpumask_and(mask, cpu_coregroup_mask(cpu), cpu_map);
         group = cpumask_first(mask);
 #elif defined(CONFIG_SCHED_SMT)
         cpumask_and(mask, &per_cpu(cpu_sibling_map, cpu), cpu_map);
@@ -7259,10 +7252,8 @@ static int cpu_to_allnodes_group(int cpu, const struct cpumask *cpu_map,
                                  struct cpumask *nodemask)
 {
         int group;
-        /* FIXME: use cpumask_of_node */
-        node_to_cpumask_ptr(pnodemask, cpu_to_node(cpu));
 
-        cpumask_and(nodemask, pnodemask, cpu_map);
+        cpumask_and(nodemask, cpumask_of_node(cpu_to_node(cpu)), cpu_map);
         group = cpumask_first(nodemask);
 
         if (sg)
@@ -7313,10 +7304,8 @@ static void free_sched_groups(const struct cpumask *cpu_map,
 
                 for (i = 0; i < nr_node_ids; i++) {
                         struct sched_group *oldsg, *sg = sched_group_nodes[i];
-                        /* FIXME: Use cpumask_of_node */
-                        node_to_cpumask_ptr(pnodemask, i);
 
-                        cpus_and(*nodemask, *pnodemask, *cpu_map);
+                        cpumask_and(nodemask, cpumask_of_node(i), cpu_map);
                         if (cpumask_empty(nodemask))
                                 continue;
 
@@ -7525,9 +7514,7 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
         for_each_cpu(i, cpu_map) {
                 struct sched_domain *sd = NULL, *p;
 
-                /* FIXME: use cpumask_of_node */
-                *nodemask = node_to_cpumask(cpu_to_node(i));
-                cpus_and(*nodemask, *nodemask, *cpu_map);
+                cpumask_and(nodemask, cpumask_of_node(cpu_to_node(i)), cpu_map);
 
 #ifdef CONFIG_NUMA
                 if (cpumask_weight(cpu_map) >
@@ -7568,9 +7555,8 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
                 sd = &per_cpu(core_domains, i).sd;
                 SD_INIT(sd, MC);
                 set_domain_attribute(sd, attr);
-                *sched_domain_span(sd) = cpu_coregroup_map(i);
-                cpumask_and(sched_domain_span(sd),
-                            sched_domain_span(sd), cpu_map);
+                cpumask_and(sched_domain_span(sd), cpu_map,
+                                                   cpu_coregroup_mask(i));
                 sd->parent = p;
                 p->child = sd;
                 cpu_to_core_group(i, cpu_map, &sd->groups, tmpmask);
@@ -7606,9 +7592,7 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
 #ifdef CONFIG_SCHED_MC
         /* Set up multi-core groups */
         for_each_cpu(i, cpu_map) {
-                /* FIXME: Use cpu_coregroup_mask */
-                *this_core_map = cpu_coregroup_map(i);
-                cpus_and(*this_core_map, *this_core_map, *cpu_map);
+                cpumask_and(this_core_map, cpu_coregroup_mask(i), cpu_map);
                 if (i != cpumask_first(this_core_map))
                         continue;
 
@@ -7620,9 +7604,7 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
 
         /* Set up physical groups */
         for (i = 0; i < nr_node_ids; i++) {
-                /* FIXME: Use cpumask_of_node */
-                *nodemask = node_to_cpumask(i);
-                cpus_and(*nodemask, *nodemask, *cpu_map);
+                cpumask_and(nodemask, cpumask_of_node(i), cpu_map);
                 if (cpumask_empty(nodemask))
                         continue;
 
@@ -7644,11 +7626,8 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
                 struct sched_group *sg, *prev;
                 int j;
 
-                /* FIXME: Use cpumask_of_node */
-                *nodemask = node_to_cpumask(i);
                 cpumask_clear(covered);
-
-                cpus_and(*nodemask, *nodemask, *cpu_map);
+                cpumask_and(nodemask, cpumask_of_node(i), cpu_map);
                 if (cpumask_empty(nodemask)) {
                         sched_group_nodes[i] = NULL;
                         continue;
@@ -7679,8 +7658,6 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
 
                 for (j = 0; j < nr_node_ids; j++) {
                         int n = (i + j) % nr_node_ids;
-                        /* FIXME: Use cpumask_of_node */
-                        node_to_cpumask_ptr(pnodemask, n);
 
                         cpumask_complement(notcovered, covered);
                         cpumask_and(tmpmask, notcovered, cpu_map);
@@ -7688,7 +7665,7 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
                         if (cpumask_empty(tmpmask))
                                 break;
 
-                        cpumask_and(tmpmask, tmpmask, pnodemask);
+                        cpumask_and(tmpmask, tmpmask, cpumask_of_node(n));
                         if (cpumask_empty(tmpmask))
                                 continue;
 
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 833b6d44483c..954e1a81b796 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1383,7 +1383,8 @@ static inline void init_sched_rt_class(void)
         unsigned int i;
 
         for_each_possible_cpu(i)
-                alloc_cpumask_var(&per_cpu(local_cpu_mask, i), GFP_KERNEL);
+                alloc_cpumask_var_node(&per_cpu(local_cpu_mask, i),
+                                        GFP_KERNEL, cpu_to_node(i));
 }
 #endif /* CONFIG_SMP */