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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2006-06-27 02:53:41 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-27 17:32:37 -0700
commit76b67ed9dce69a6a329cdd66f94af1787f417b62 (patch)
tree4d80993e607ae4a870f98ad3441795737570b012 /drivers/base/node.c
parentdd0932d9d4301bd58a4d5a634a3a8298c4fc5e24 (diff)
[PATCH] node hotplug: register cpu: remove node struct
With Goto-san's patch, we can add new pgdat/node at runtime. I'm now considering node-hot-add with cpu + memory on ACPI. I found acpi container, which describes node, could evaluate cpu before memory. This means cpu-hot-add occurs before memory hot add. In most part, cpu-hot-add doesn't depend on node hot add. But register_cpu(), which creates symbolic link from node to cpu, requires that node should be onlined before register_cpu(). When a node is onlined, its pgdat should be there. This patch-set holds off creating symbolic link from node to cpu until node is onlined. This removes node arguments from register_cpu(). Now, register_cpu() requires 'struct node' as its argument. But the array of struct node is now unified in driver/base/node.c now (By Goto's node hotplug patch). We can get struct node in generic way. So, this argument is not necessary now. This patch also guarantees add cpu under node only when node is onlined. It is necessary for node-hot-add vs. cpu-hot-add patch following this. Moreover, register_cpu calculates cpu->node_id by cpu_to_node() without regard to its 'struct node *root' argument. This patch removes it. Also modify callers of register_cpu()/unregister_cpu, whose args are changed by register-cpu-remove-node-struct patch. [Brice.Goglin@ens-lyon.org: fix it] Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Yasunori Goto <y-goto@jp.fujitsu.com> Cc: Ashok Raj <ashok.raj@intel.com> Cc: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Brice Goglin <Brice.Goglin@ens-lyon.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/base/node.c')
-rw-r--r--drivers/base/node.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/base/node.c b/drivers/base/node.c
index cbd0f62b4870..eae2bdc183bb 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -11,6 +11,7 @@
#include <linux/cpumask.h>
#include <linux/topology.h>
#include <linux/nodemask.h>
+#include <linux/cpu.h>
static struct sysdev_class node_class = {
set_kset_name("node"),
@@ -192,9 +193,38 @@ void unregister_node(struct node *node)
struct node node_devices[MAX_NUMNODES];
+/*
+ * register cpu under node
+ */
+int register_cpu_under_node(unsigned int cpu, unsigned int nid)
+{
+ if (node_online(nid)) {
+ struct sys_device *obj = get_cpu_sysdev(cpu);
+ if (!obj)
+ return 0;
+ return sysfs_create_link(&node_devices[nid].sysdev.kobj,
+ &obj->kobj,
+ kobject_name(&obj->kobj));
+ }
+
+ return 0;
+}
+
+int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
+{
+ if (node_online(nid)) {
+ struct sys_device *obj = get_cpu_sysdev(cpu);
+ if (obj)
+ sysfs_remove_link(&node_devices[nid].sysdev.kobj,
+ kobject_name(&obj->kobj));
+ }
+ return 0;
+}
+
int register_one_node(int nid)
{
int error = 0;
+ int cpu;
if (node_online(nid)) {
int p_node = parent_node(nid);
@@ -204,6 +234,12 @@ int register_one_node(int nid)
parent = &node_devices[p_node];
error = register_node(&node_devices[nid], nid, parent);
+
+ /* link cpu under this node */
+ for_each_present_cpu(cpu) {
+ if (cpu_to_node(cpu) == nid)
+ register_cpu_under_node(cpu, nid);
+ }
}
return error;