From 1830794ae6392ce12d36dbcc5ff52f11298ddab6 Mon Sep 17 00:00:00 2001 From: Alex Chiang Date: Mon, 14 Dec 2009 17:59:08 -0800 Subject: [PATCH] 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 Acked-by: David Rientjes Cc: Gary Hade Cc: Badari Pulavarty Cc: Ingo Molnar Cc: David Rientjes Cc: Greg KH Cc: Randy Dunlap Cc: David Rientjes Cc: KOSAKI Motohiro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/base/node.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/base/node.c b/drivers/base/node.c index 9b9acc39a1eb6..41414113b9f05 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; } -- 2.39.5