sched: convert local_cpu_mask to cpumask_var_t.

Impact: (future) size reduction for large NR_CPUS.

Dynamically allocating cpumasks (when CONFIG_CPUMASK_OFFSTACK) saves
space for small nr_cpu_ids but big CONFIG_NR_CPUS.  cpumask_var_t
is just a struct cpumask for !CONFIG_CPUMASK_OFFSTACK.

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

2 files changed, 12 insertions, 2 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 94fa333c1e7c..f2be61870030 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -8018,6 +8018,7 @@ void __init sched_init_smp(void)
         free_cpumask_var(non_isolated_cpus);
 
         alloc_cpumask_var(&fallback_doms, GFP_KERNEL);
+        init_sched_rt_class();
 }
 #else
 void __init sched_init_smp(void)
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 1fa13624293e..1f0e99d1a8ce 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -962,7 +962,7 @@ static struct task_struct *pick_next_highest_task_rt(struct rq *rq, int cpu)
         return next;
 }
 
-static DEFINE_PER_CPU(cpumask_t, local_cpu_mask);
+static DEFINE_PER_CPU(cpumask_var_t, local_cpu_mask);
 
 static inline int pick_optimal_cpu(int this_cpu, cpumask_t *mask)
 {
@@ -982,7 +982,7 @@ static inline int pick_optimal_cpu(int this_cpu, cpumask_t *mask)
 static int find_lowest_rq(struct task_struct *task)
 {
         struct sched_domain *sd;
-        cpumask_t *lowest_mask = &__get_cpu_var(local_cpu_mask);
+        cpumask_t *lowest_mask = __get_cpu_var(local_cpu_mask);
         int this_cpu = smp_processor_id();
         int cpu      = task_cpu(task);
 
@@ -1551,3 +1551,12 @@ static void print_rt_stats(struct seq_file *m, int cpu)
         rcu_read_unlock();
 }
 #endif /* CONFIG_SCHED_DEBUG */
+
+/* Note that this is never called for !SMP, but that's OK. */
+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);
+}