powerpc/pseries: Correct pseries/dlpar.c build break without CONFIG_SMP

The recent patch to add cpu offline/online as part of the DLPAR
process for pseries causes a build break if CONFIG_SMP is not
defined.  Original patch here;
http://lists.ozlabs.org/pipermail/linuxppc-dev/2009-November/078299.html

This corrects the build break by moving the online_node_cpus
and offline_node_cpus under the #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
portions of dlpar.c.

This patch also slightly modifies the online_node_cpus and offline_node_cpus
routines to prepend dlpar_ to the them and make them static.  These two
routine are only used in the dlpar add/remove of cpus and these changes
should help clarify that.

Signed-off-by: Nathan Fontenot <nfont@austin.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c
index fd2f0af..12df9e8 100644 (file)
--- a/arch/powerpc/platforms/pseries/dlpar.c
+++ b/arch/powerpc/platforms/pseries/dlpar.c
@@ -288,98 +288,6 @@ int dlpar_detach_node(struct device_node *dn)
        return 0;
 }
 
-int online_node_cpus(struct device_node *dn)
-{
-       int rc = 0;
-       unsigned int cpu;
-       int len, nthreads, i;
-       const u32 *intserv;
-
-       intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
-       if (!intserv)
-               return -EINVAL;
-
-       nthreads = len / sizeof(u32);
-
-       cpu_maps_update_begin();
-       for (i = 0; i < nthreads; i++) {
-               for_each_present_cpu(cpu) {
-                       if (get_hard_smp_processor_id(cpu) != intserv[i])
-                               continue;
-                       BUG_ON(get_cpu_current_state(cpu)
-                                       != CPU_STATE_OFFLINE);
-                       cpu_maps_update_done();
-                       rc = cpu_up(cpu);
-                       if (rc)
-                               goto out;
-                       cpu_maps_update_begin();
-
-                       break;
-               }
-               if (cpu == num_possible_cpus())
-                       printk(KERN_WARNING "Could not find cpu to online "
-                              "with physical id 0x%x\n", intserv[i]);
-       }
-       cpu_maps_update_done();
-
-out:
-       return rc;
-
-}
-
-int offline_node_cpus(struct device_node *dn)
-{
-       int rc = 0;
-       unsigned int cpu;
-       int len, nthreads, i;
-       const u32 *intserv;
-
-       intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
-       if (!intserv)
-               return -EINVAL;
-
-       nthreads = len / sizeof(u32);
-
-       cpu_maps_update_begin();
-       for (i = 0; i < nthreads; i++) {
-               for_each_present_cpu(cpu) {
-                       if (get_hard_smp_processor_id(cpu) != intserv[i])
-                               continue;
-
-                       if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE)
-                               break;
-
-                       if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) {
-                               cpu_maps_update_done();
-                               rc = cpu_down(cpu);
-                               if (rc)
-                                       goto out;
-                               cpu_maps_update_begin();
-                               break;
-
-                       }
-
-                       /*
-                        * The cpu is in CPU_STATE_INACTIVE.
-                        * Upgrade it's state to CPU_STATE_OFFLINE.
-                        */
-                       set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
-                       BUG_ON(plpar_hcall_norets(H_PROD, intserv[i])
-                                                               != H_SUCCESS);
-                       __cpu_die(cpu);
-                       break;
-               }
-               if (cpu == num_possible_cpus())
-                       printk(KERN_WARNING "Could not find cpu to offline "
-                              "with physical id 0x%x\n", intserv[i]);
-       }
-       cpu_maps_update_done();
-
-out:
-       return rc;
-
-}
-
 #define DR_ENTITY_SENSE                9003
 #define DR_ENTITY_PRESENT      1
 #define DR_ENTITY_UNUSABLE     2
@@ -448,6 +356,45 @@ void cpu_hotplug_driver_unlock()
        mutex_unlock(&pseries_cpu_hotplug_mutex);
 }
 
+static int dlpar_online_cpu(struct device_node *dn)
+{
+       int rc = 0;
+       unsigned int cpu;
+       int len, nthreads, i;
+       const u32 *intserv;
+
+       intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
+       if (!intserv)
+               return -EINVAL;
+
+       nthreads = len / sizeof(u32);
+
+       cpu_maps_update_begin();
+       for (i = 0; i < nthreads; i++) {
+               for_each_present_cpu(cpu) {
+                       if (get_hard_smp_processor_id(cpu) != intserv[i])
+                               continue;
+                       BUG_ON(get_cpu_current_state(cpu)
+                                       != CPU_STATE_OFFLINE);
+                       cpu_maps_update_done();
+                       rc = cpu_up(cpu);
+                       if (rc)
+                               goto out;
+                       cpu_maps_update_begin();
+
+                       break;
+               }
+               if (cpu == num_possible_cpus())
+                       printk(KERN_WARNING "Could not find cpu to online "
+                              "with physical id 0x%x\n", intserv[i]);
+       }
+       cpu_maps_update_done();
+
+out:
+       return rc;
+
+}
+
 static ssize_t dlpar_cpu_probe(const char *buf, size_t count)
 {
        struct device_node *dn;
@@ -497,13 +444,66 @@ static ssize_t dlpar_cpu_probe(const char *buf, size_t count)
                dlpar_free_cc_nodes(dn);
        }
 
-       rc = online_node_cpus(dn);
+       rc = dlpar_online_cpu(dn);
 out:
        cpu_hotplug_driver_unlock();
 
        return rc ? rc : count;
 }
 
+static int dlpar_offline_cpu(struct device_node *dn)
+{
+       int rc = 0;
+       unsigned int cpu;
+       int len, nthreads, i;
+       const u32 *intserv;
+
+       intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
+       if (!intserv)
+               return -EINVAL;
+
+       nthreads = len / sizeof(u32);
+
+       cpu_maps_update_begin();
+       for (i = 0; i < nthreads; i++) {
+               for_each_present_cpu(cpu) {
+                       if (get_hard_smp_processor_id(cpu) != intserv[i])
+                               continue;
+
+                       if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE)
+                               break;
+
+                       if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) {
+                               cpu_maps_update_done();
+                               rc = cpu_down(cpu);
+                               if (rc)
+                                       goto out;
+                               cpu_maps_update_begin();
+                               break;
+
+                       }
+
+                       /*
+                        * The cpu is in CPU_STATE_INACTIVE.
+                        * Upgrade it's state to CPU_STATE_OFFLINE.
+                        */
+                       set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
+                       BUG_ON(plpar_hcall_norets(H_PROD, intserv[i])
+                                                               != H_SUCCESS);
+                       __cpu_die(cpu);
+                       break;
+               }
+               if (cpu == num_possible_cpus())
+                       printk(KERN_WARNING "Could not find cpu to offline "
+                              "with physical id 0x%x\n", intserv[i]);
+       }
+       cpu_maps_update_done();
+
+out:
+       return rc;
+
+}
+
 static ssize_t dlpar_cpu_release(const char *buf, size_t count)
 {
        struct device_node *dn;
@@ -521,7 +521,7 @@ static ssize_t dlpar_cpu_release(const char *buf, size_t count)
        }
 
        cpu_hotplug_driver_lock();
-       rc = offline_node_cpus(dn);
+       rc = dlpar_offline_cpu(dn);
        if (rc) {
                of_node_put(dn);
                rc = -EINVAL;