[IA64] Minimize per_cpu reservations.

This attached patch significantly shrinks boot memory allocation on ia64.
It does this by not allocating per_cpu areas for cpus that can never
exist.

In the case where acpi does not have any numa node description of the
cpus, I defaulted to assigning the first 32 round-robin on the known
nodes..  For the !CONFIG_ACPI  I used for_each_possible_cpu().

Signed-off-by: Robin Holt <holt@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 4 insertions, 8 deletions

diff --git a/arch/ia64/mm/discontig.c b/arch/ia64/mm/discontig.c
index 06c540a29467..6136a4c6df11 100644
--- a/arch/ia64/mm/discontig.c
+++ b/arch/ia64/mm/discontig.c
@@ -104,7 +104,7 @@ static int __meminit early_nr_cpus_node(int node)
 {
         int cpu, n = 0;
 
-        for (cpu = 0; cpu < NR_CPUS; cpu++)
+        for_each_possible_early_cpu(cpu)
                 if (node == node_cpuid[cpu].nid)
                         n++;
 
@@ -143,7 +143,7 @@ static void *per_cpu_node_setup(void *cpu_data, int node)
 #ifdef CONFIG_SMP
         int cpu;
 
-        for (cpu = 0; cpu < NR_CPUS; cpu++) {
+        for_each_possible_early_cpu(cpu) {
                 if (node == node_cpuid[cpu].nid) {
                         memcpy(__va(cpu_data), __phys_per_cpu_start,
                                __per_cpu_end - __per_cpu_start);
@@ -346,7 +346,7 @@ static void __init initialize_pernode_data(void)
 
 #ifdef CONFIG_SMP
         /* Set the node_data pointer for each per-cpu struct */
-        for (cpu = 0; cpu < NR_CPUS; cpu++) {
+        for_each_possible_early_cpu(cpu) {
                 node = node_cpuid[cpu].nid;
                 per_cpu(cpu_info, cpu).node_data = mem_data[node].node_data;
         }
@@ -494,13 +494,9 @@ void __cpuinit *per_cpu_init(void)
         int cpu;
         static int first_time = 1;
 
-
-        if (smp_processor_id() != 0)
-                return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
-
         if (first_time) {
                 first_time = 0;
-                for (cpu = 0; cpu < NR_CPUS; cpu++)
+                for_each_possible_early_cpu(cpu)
                         per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
         }