mm: add numa node symlink for cpu devices in sysfs
You can discover which CPUs belong to a NUMA node by examining
/sys/devices/system/node/node#/
However, it's not convenient to go in the other direction, when looking at
/sys/devices/system/cpu/cpu#/
Yes, you can muck about in sysfs, but adding these symlinks makes life a
lot more convenient.
Signed-off-by: Alex Chiang <achiang@hp.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Gary Hade <garyhade@us.ibm.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg KH <greg@kroah.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: David Rientjes <rientjes@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 9b9acc3..4141411 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -271,6 +271,7 @@
*/
int register_cpu_under_node(unsigned int cpu, unsigned int nid)
{
+ int ret;
struct sys_device *obj;
if (!node_online(nid))
@@ -280,9 +281,15 @@
if (!obj)
return 0;
- return sysfs_create_link(&node_devices[nid].sysdev.kobj,
+ ret = sysfs_create_link(&node_devices[nid].sysdev.kobj,
&obj->kobj,
kobject_name(&obj->kobj));
+ if (ret)
+ return ret;
+
+ return sysfs_create_link(&obj->kobj,
+ &node_devices[nid].sysdev.kobj,
+ kobject_name(&node_devices[nid].sysdev.kobj));
}
int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
@@ -298,6 +305,8 @@
sysfs_remove_link(&node_devices[nid].sysdev.kobj,
kobject_name(&obj->kobj));
+ sysfs_remove_link(&obj->kobj,
+ kobject_name(&node_devices[nid].sysdev.kobj));
return 0;
}