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authorAlex Chiang <achiang@hp.com>2009-12-14 17:59:08 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-15 08:53:18 -0800
commit1830794ae6392ce12d36dbcc5ff52f11298ddab6 (patch)
treeb1ebda5a62d2b8d904840f041fc334fecc274b18
parentb9d52dad9447d0db4b52d67d5e9e9d339b5e8302 (diff)
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>
-rw-r--r--drivers/base/node.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 9b9acc39a1e..41414113b9f 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -271,6 +271,7 @@ struct node node_devices[MAX_NUMNODES];
*/
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 @@ int register_cpu_under_node(unsigned int cpu, unsigned int nid)
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 @@ int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
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;
}