[RFC v2 PATCH 01/21] x86: Split memory hotplug function from cpu_up() as cpu_memory_up()

[Tomoki Sekiyama]

Split memory hotplug function from cpu_up() as cpu_memory_up(), which will
be used for assigning memory area to off-lined cpus at following patch
in this series.

Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama...@hitachi.com>
Cc: Avi Kivity <a...@redhat.com>
Cc: Marcelo Tosatti <mtosa...@redhat.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: "H. Peter Anvin" <h...@zytor.com>
---

 include/linux/cpu.h |    9 +++++++++
 kernel/cpu.c        |   46 +++++++++++++++++++++++++++-------------------
 2 files changed, 36 insertions(+), 19 deletions(-)

diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index ce7a074..8395ac9 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -146,6 +146,15 @@ void notify_cpu_starting(unsigned int cpu);
 extern void cpu_maps_update_begin(void);
 extern void cpu_maps_update_done(void);
 
+#ifdef CONFIG_MEMORY_HOTPLUG
+extern int cpu_memory_up(unsigned int cpu);
+#else
+static inline int cpu_memory_up(unsigned int cpu)
+{
+       return 0;
+}
+#endif
+
 #else  /* CONFIG_SMP */
 
 #define cpu_notifier(fn, pri)  do { (void)(fn); } while (0)
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 14d3258..5df8f36 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -384,11 +384,6 @@ int __cpuinit cpu_up(unsigned int cpu)
 {
        int err = 0;
 
-#ifdef CONFIG_MEMORY_HOTPLUG
-       int nid;
-       pg_data_t       *pgdat;
-#endif
-
        if (!cpu_possible(cpu)) {
                printk(KERN_ERR "can't online cpu %d because it is not "
                        "configured as may-hotadd at boot time\n", cpu);
@@ -399,7 +394,32 @@ int __cpuinit cpu_up(unsigned int cpu)
                return -EINVAL;
        }
 
+       err = cpu_memory_up(cpu);
+       if (err)
+               return err;
+
+       cpu_maps_update_begin();
+
+       if (cpu_hotplug_disabled) {
+               err = -EBUSY;
+               goto out;
+       }
+
+       err = _cpu_up(cpu, 0);
+
+out:
+       cpu_maps_update_done();
+       return err;
+}
+EXPORT_SYMBOL_GPL(cpu_up);
+
 #ifdef CONFIG_MEMORY_HOTPLUG
+int __cpuinit cpu_memory_up(unsigned int cpu)
+{
+       int err;
+       int nid;
+       pg_data_t       *pgdat;
+
        nid = cpu_to_node(cpu);
        if (!node_online(nid)) {
                err = mem_online_node(nid);
@@ -419,22 +439,10 @@ int __cpuinit cpu_up(unsigned int cpu)
                build_all_zonelists(NULL, NULL);
                mutex_unlock(&zonelists_mutex);
        }
-#endif
 
-       cpu_maps_update_begin();
-
-       if (cpu_hotplug_disabled) {
-               err = -EBUSY;
-               goto out;
-       }
-
-       err = _cpu_up(cpu, 0);
-
-out:
-       cpu_maps_update_done();
-       return err;
+       return 0;
 }
-EXPORT_SYMBOL_GPL(cpu_up);
+#endif
 
 #ifdef CONFIG_PM_SLEEP_SMP
 static cpumask_var_t frozen_cpus;


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