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Subject[patch 4/7, v7] NUMA Hotplug Emulation: Abstract cpu register functions
From: Shaohui Zheng <shaohui.zheng@intel.com>

Abstract cpu register functions, provide a more flexible interface
register_cpu_node, the new interface provides convenience to add cpu
to a specified node, we can use it to add a cpu to a fake node.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Shaohui Zheng <shaohui.zheng@intel.com>
---
Index: linux-hpe4/arch/x86/include/asm/cpu.h
===================================================================
--- linux-hpe4.orig/arch/x86/include/asm/cpu.h 2010-11-17 09:00:59.742608402 +0800
+++ linux-hpe4/arch/x86/include/asm/cpu.h 2010-11-17 09:01:10.192838977 +0800
@@ -27,6 +27,7 @@

#ifdef CONFIG_HOTPLUG_CPU
extern int arch_register_cpu(int num);
+extern int arch_register_cpu_node(int num, int nid);
extern void arch_unregister_cpu(int);
#endif

Index: linux-hpe4/arch/x86/kernel/topology.c
===================================================================
--- linux-hpe4.orig/arch/x86/kernel/topology.c 2010-11-17 09:01:01.053461766 +0800
+++ linux-hpe4/arch/x86/kernel/topology.c 2010-11-17 10:05:32.934085248 +0800
@@ -52,6 +52,15 @@
}
EXPORT_SYMBOL(arch_register_cpu);

+int __ref arch_register_cpu_node(int num, int nid)
+{
+ if (num)
+ per_cpu(cpu_devices, num).cpu.hotpluggable = 1;
+
+ return register_cpu_node(&per_cpu(cpu_devices, num).cpu, num, nid);
+}
+EXPORT_SYMBOL(arch_register_cpu_node);
+
void arch_unregister_cpu(int num)
{
unregister_cpu(&per_cpu(cpu_devices, num).cpu);
Index: linux-hpe4/drivers/base/cpu.c
===================================================================
--- linux-hpe4.orig/drivers/base/cpu.c 2010-11-17 09:01:01.053461766 +0800
+++ linux-hpe4/drivers/base/cpu.c 2010-11-17 10:05:32.943465010 +0800
@@ -208,17 +208,18 @@
static SYSDEV_CLASS_ATTR(offline, 0444, print_cpus_offline, NULL);

/*
- * register_cpu - Setup a sysfs device for a CPU.
+ * register_cpu_node - Setup a sysfs device for a CPU.
* @cpu - cpu->hotpluggable field set to 1 will generate a control file in
* sysfs for this CPU.
* @num - CPU number to use when creating the device.
+ * @nid - Node ID to use, if any.
*
* Initialize and register the CPU device.
*/
-int __cpuinit register_cpu(struct cpu *cpu, int num)
+int __cpuinit register_cpu_node(struct cpu *cpu, int num, int nid)
{
int error;
- cpu->node_id = cpu_to_node(num);
+ cpu->node_id = nid;
cpu->sysdev.id = num;
cpu->sysdev.cls = &cpu_sysdev_class;

@@ -229,7 +230,7 @@
if (!error)
per_cpu(cpu_sys_devices, num) = &cpu->sysdev;
if (!error)
- register_cpu_under_node(num, cpu_to_node(num));
+ register_cpu_under_node(num, nid);

#ifdef CONFIG_KEXEC
if (!error)
Index: linux-hpe4/include/linux/cpu.h
===================================================================
--- linux-hpe4.orig/include/linux/cpu.h 2010-11-17 09:00:59.772898926 +0800
+++ linux-hpe4/include/linux/cpu.h 2010-11-17 10:05:32.954085309 +0800
@@ -30,7 +30,13 @@
struct sys_device sysdev;
};

-extern int register_cpu(struct cpu *cpu, int num);
+extern int register_cpu_node(struct cpu *cpu, int num, int nid);
+
+static inline int register_cpu(struct cpu *cpu, int num)
+{
+ return register_cpu_node(cpu, num, cpu_to_node(num));
+}
+
extern struct sys_device *get_cpu_sysdev(unsigned cpu);

extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr);
--
Thanks & Regards,
Shaohui




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