X-Git-Url: https://rtime.felk.cvut.cz/gitweb/linux-imx.git/blobdiff_plain/349daa0f93177958c4618542a61926674169a698..346404682434ad0e31b71f9f37fb6c45a46fe208:/drivers/base/cpu.c

diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index d8c7f3ee6e19..3d48fc887ef4 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -25,6 +25,15 @@ EXPORT_SYMBOL_GPL(cpu_subsys);
 static DEFINE_PER_CPU(struct device *, cpu_sys_devices);
 
 #ifdef CONFIG_HOTPLUG_CPU
+static void change_cpu_under_node(struct cpu *cpu,
+			unsigned int from_nid, unsigned int to_nid)
+{
+	int cpuid = cpu->dev.id;
+	unregister_cpu_under_node(cpuid, from_nid);
+	register_cpu_under_node(cpuid, to_nid);
+	cpu->node_id = to_nid;
+}
+
 static ssize_t show_online(struct device *dev,
 			   struct device_attribute *attr,
 			   char *buf)
@@ -39,17 +48,29 @@ static ssize_t __ref store_online(struct device *dev,
 				  const char *buf, size_t count)
 {
 	struct cpu *cpu = container_of(dev, struct cpu, dev);
+	int cpuid = cpu->dev.id;
+	int from_nid, to_nid;
 	ssize_t ret;
 
 	cpu_hotplug_driver_lock();
 	switch (buf[0]) {
 	case '0':
-		ret = cpu_down(cpu->dev.id);
+		ret = cpu_down(cpuid);
 		if (!ret)
 			kobject_uevent(&dev->kobj, KOBJ_OFFLINE);
 		break;
 	case '1':
-		ret = cpu_up(cpu->dev.id);
+		from_nid = cpu_to_node(cpuid);
+		ret = cpu_up(cpuid);
+
+		/*
+		 * When hot adding memory to memoryless node and enabling a cpu
+		 * on the node, node number of the cpu may internally change.
+		 */
+		to_nid = cpu_to_node(cpuid);
+		if (from_nid != to_nid)
+			change_cpu_under_node(cpu, from_nid, to_nid);
+
 		if (!ret)
 			kobject_uevent(&dev->kobj, KOBJ_ONLINE);
 		break;