1 files changed, 22 insertions, 24 deletions

diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c
index a947899dcba1..90e9ba11eba1 100644
--- a/arch/s390/kernel/topology.c
+++ b/arch/s390/kernel/topology.c
@@ -3,6 +3,9 @@
  *    Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
  */
 
+#define KMSG_COMPONENT "cpu"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/init.h>
@@ -12,6 +15,7 @@
 #include <linux/workqueue.h>
 #include <linux/cpu.h>
 #include <linux/smp.h>
+#include <linux/cpuset.h>
 #include <asm/delay.h>
 #include <asm/s390_ext.h>
 #include <asm/sysinfo.h>
@@ -57,11 +61,11 @@ struct core_info {
         cpumask_t mask;
 };
 
+static int topology_enabled;
 static void topology_work_fn(struct work_struct *work);
 static struct tl_info *tl_info;
 static struct core_info core_info;
 static int machine_has_topology;
-static int machine_has_topology_irq;
 static struct timer_list topology_timer;
 static void set_topology_timer(void);
 static DECLARE_WORK(topology_work, topology_work_fn);
@@ -77,8 +81,8 @@ cpumask_t cpu_coregroup_map(unsigned int cpu)
         cpumask_t mask;
 
         cpus_clear(mask);
-        if (!machine_has_topology)
-                return cpu_present_map;
+        if (!topology_enabled || !machine_has_topology)
+                return cpu_possible_map;
         spin_lock_irqsave(&topology_lock, flags);
         while (core) {
                 if (cpu_isset(cpu, core->mask)) {
@@ -168,7 +172,7 @@ static void topology_update_polarization_simple(void)
         int cpu;
 
         mutex_lock(&smp_cpu_state_mutex);
-        for_each_present_cpu(cpu)
+        for_each_possible_cpu(cpu)
                 smp_cpu_polarization[cpu] = POLARIZATION_HRZ;
         mutex_unlock(&smp_cpu_state_mutex);
 }
@@ -199,7 +203,7 @@ int topology_set_cpu_management(int fc)
                 rc = ptf(PTF_HORIZONTAL);
         if (rc)
                 return -EBUSY;
-        for_each_present_cpu(cpu)
+        for_each_possible_cpu(cpu)
                 smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN;
         return rc;
 }
@@ -208,11 +212,11 @@ static void update_cpu_core_map(void)
 {
         int cpu;
 
-        for_each_present_cpu(cpu)
+        for_each_possible_cpu(cpu)
                 cpu_core_map[cpu] = cpu_coregroup_map(cpu);
 }
 
-void arch_update_cpu_topology(void)
+int arch_update_cpu_topology(void)
 {
         struct tl_info *info = tl_info;
         struct sys_device *sysdev;
@@ -221,7 +225,7 @@ void arch_update_cpu_topology(void)
         if (!machine_has_topology) {
                 update_cpu_core_map();
                 topology_update_polarization_simple();
-                return;
+                return 0;
         }
         stsi(info, 15, 1, 2);
         tl_to_cores(info);
@@ -230,11 +234,12 @@ void arch_update_cpu_topology(void)
                 sysdev = get_cpu_sysdev(cpu);
                 kobject_uevent(&sysdev->kobj, KOBJ_CHANGE);
         }
+        return 1;
 }
 
 static void topology_work_fn(struct work_struct *work)
 {
-        arch_reinit_sched_domains();
+        rebuild_sched_domains();
 }
 
 void topology_schedule_update(void)
@@ -257,10 +262,14 @@ static void set_topology_timer(void)
         add_timer(&topology_timer);
 }
 
-static void topology_interrupt(__u16 code)
+static int __init early_parse_topology(char *p)
 {
-        schedule_work(&topology_work);
+        if (strncmp(p, "on", 2))
+                return 0;
+        topology_enabled = 1;
+        return 0;
 }
+early_param("topology", early_parse_topology);
 
 static int __init init_topology_update(void)
 {
@@ -272,14 +281,7 @@ static int __init init_topology_update(void)
                 goto out;
         }
         init_timer_deferrable(&topology_timer);
-        if (machine_has_topology_irq) {
-                rc = register_external_interrupt(0x2005, topology_interrupt);
-                if (rc)
-                        goto out;
-                ctl_set_bit(0, 8);
-        }
-        else
-                set_topology_timer();
+        set_topology_timer();
 out:
         update_cpu_core_map();
         return rc;
@@ -300,9 +302,6 @@ void __init s390_init_cpu_topology(void)
                 return;
         machine_has_topology = 1;
 
-        if (facility_bits & (1ULL << 51))
-                machine_has_topology_irq = 1;
-
         tl_info = alloc_bootmem_pages(PAGE_SIZE);
         info = tl_info;
         stsi(info, 15, 1, 2);
@@ -311,7 +310,7 @@ void __init s390_init_cpu_topology(void)
         for (i = 0; i < info->mnest - 2; i++)
                 nr_cores *= info->mag[NR_MAG - 3 - i];
 
-        printk(KERN_INFO "CPU topology:");
+        pr_info("The CPU configuration topology of the machine is:");
         for (i = 0; i < NR_MAG; i++)
                 printk(" %d", info->mag[i]);
         printk(" / %d\n", info->mnest);
@@ -326,5 +325,4 @@ void __init s390_init_cpu_topology(void)
         return;
 error:
         machine_has_topology = 0;
-        machine_has_topology_irq = 0;
 }