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Subject[PATCH 4/5] mm: add numa node symlink for cpu devices in sysfs
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Date
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>
---
drivers/base/node.c | 9 ++++++++-
1 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/drivers/base/node.c b/drivers/base/node.c
index ffda067..47a4997 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -227,6 +227,7 @@ 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))
@@ -236,9 +237,13 @@ 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));
+
+ 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)
@@ -254,6 +259,8 @@ 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;
}


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