Safer nr_node_ids and nr_node_ids determination and initial values

The nr_cpu_ids value is currently only calculated in smp_init.  However, it
may be needed before (SLUB needs it on kmem_cache_init!) and other kernel
components may also want to allocate dynamically sized per cpu array before
smp_init.  So move the determination of possible cpus into sched_init()
where we already loop over all possible cpus early in boot.

Also initialize both nr_node_ids and nr_cpu_ids with the highest value they
could take.  If we have accidental users before these values are determined
then the current valud of 0 may cause too small per cpu and per node arrays
to be allocated.  If it is set to the maximum possible then we only waste
some memory for early boot users.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 960d7c5fca39..0227f1625a75 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5244,6 +5244,11 @@ int __init migration_init(void)
 #endif
 
 #ifdef CONFIG_SMP
+
+/* Number of possible processor ids */
+int nr_cpu_ids __read_mostly = NR_CPUS;
+EXPORT_SYMBOL(nr_cpu_ids);
+
 #undef SCHED_DOMAIN_DEBUG
 #ifdef SCHED_DOMAIN_DEBUG
 static void sched_domain_debug(struct sched_domain *sd, int cpu)
@@ -6726,6 +6731,7 @@ int in_sched_functions(unsigned long addr)
 void __init sched_init(void)
 {
         int i, j, k;
+        int highest_cpu = 0;
 
         for_each_possible_cpu(i) {
                 struct prio_array *array;
@@ -6760,11 +6766,13 @@ void __init sched_init(void)
                         // delimiter for bitsearch
                         __set_bit(MAX_PRIO, array->bitmap);
                 }
+                highest_cpu = i;
         }
 
         set_load_weight(&init_task);
 
 #ifdef CONFIG_SMP
+        nr_cpu_ids = highest_cpu + 1;
         open_softirq(SCHED_SOFTIRQ, run_rebalance_domains, NULL);
 #endif