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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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