[S390] Automatically detect added cpus.

Signed-off-by: Heiko Carstens <[e-mail]>
Signed-off-by: Martin Schwidefsky <[e-mail]>

arch/s390/kernel/smp.c

···
 	return rc;
 }
 
-static int smp_rescan_cpus(void)
+static int __smp_rescan_cpus(void)
 {
 	cpumask_t avail;
 
···
 	kfree(info);
 	printk(KERN_INFO "CPUs: %d configured, %d standby\n", c_cpus, s_cpus);
 	get_online_cpus();
-	smp_rescan_cpus();
+	__smp_rescan_cpus();
 	put_online_cpus();
 }
 
···
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
-static ssize_t __ref rescan_store(struct sys_device *dev,
-				  const char *buf, size_t count)
+
+int smp_rescan_cpus(void)
 {
 	cpumask_t newcpus;
 	int cpu;
···
 	get_online_cpus();
 	mutex_lock(&smp_cpu_state_mutex);
 	newcpus = cpu_present_map;
-	rc = smp_rescan_cpus();
+	rc = __smp_rescan_cpus();
 	if (rc)
 		goto out;
 	cpus_andnot(newcpus, cpu_present_map, newcpus);
···
 	put_online_cpus();
 	if (!cpus_empty(newcpus))
 		topology_schedule_update();
+	return rc;
+}
+
+static ssize_t __ref rescan_store(struct sys_device *dev, const char *buf,
+				  size_t count)
+{
+	int rc;
+
+	rc = smp_rescan_cpus();
 	return rc ? rc : count;
 }
 static SYSDEV_ATTR(rescan, 0200, NULL, rescan_store);

drivers/s390/char/sclp_config.c

···
 #include <linux/cpu.h>
 #include <linux/sysdev.h>
 #include <linux/workqueue.h>
+#include <asm/smp.h>
 #include "sclp.h"
 
 #define TAG	"sclp_config: "
···
 	u8 ev_qualifier;
 } __attribute__((packed));
 
+#define EV_QUAL_CPU_CHANGE	1
 #define EV_QUAL_CAP_CHANGE	3
 
 static struct work_struct sclp_cpu_capability_work;
+static struct work_struct sclp_cpu_change_work;
 
 static void sclp_cpu_capability_notify(struct work_struct *work)
 {
···
 	put_online_cpus();
 }
 
+static void sclp_cpu_change_notify(struct work_struct *work)
+{
+	smp_rescan_cpus();
+}
+
 static void sclp_conf_receiver_fn(struct evbuf_header *evbuf)
 {
 	struct conf_mgm_data *cdata;
 
 	cdata = (struct conf_mgm_data *)(evbuf + 1);
-	if (cdata->ev_qualifier == EV_QUAL_CAP_CHANGE)
+	switch (cdata->ev_qualifier) {
+	case EV_QUAL_CPU_CHANGE:
+		schedule_work(&sclp_cpu_change_work);
+		break;
+	case EV_QUAL_CAP_CHANGE:
 		schedule_work(&sclp_cpu_capability_work);
+		break;
+	}
 }
 
 static struct sclp_register sclp_conf_register =
···
 	int rc;
 
 	INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify);
+	INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify);
 
 	rc = sclp_register(&sclp_conf_register);
 	if (rc) {

include/asm-s390/smp.h

···
 #define smp_cpu_not_running(cpu)	1
 #endif
 
+#ifdef CONFIG_HOTPLUG_CPU
+extern int smp_rescan_cpus(void);
+#else
+static inline int smp_rescan_cpus(void) { return 0; }
+#endif
+
 extern union save_area *zfcpdump_save_areas[NR_CPUS + 1];
 #endif