• KAMEZAWA Hiroyuki's avatar
    [PATCH] node hotplug: register cpu: remove node struct · 76b67ed9
    KAMEZAWA Hiroyuki authored
    With Goto-san's patch, we can add new pgdat/node at runtime.  I'm now
    considering node-hot-add with cpu + memory on ACPI.
    I found acpi container, which describes node, could evaluate cpu before
    memory. This means cpu-hot-add occurs before memory hot add.
    In most part, cpu-hot-add doesn't depend on node hot add.  But register_cpu(),
    which creates symbolic link from node to cpu, requires that node should be
    onlined before register_cpu().  When a node is onlined, its pgdat should be
    This patch-set holds off creating symbolic link from node to cpu
    until node is onlined.
    This removes node arguments from register_cpu().
    Now, register_cpu() requires 'struct node' as its argument.  But the array of
    struct node is now unified in driver/base/node.c now (By Goto's node hotplug
    patch).  We can get struct node in generic way.  So, this argument is not
    necessary now.
    This patch also guarantees add cpu under node only when node is onlined.  It
    is necessary for node-hot-add vs.  cpu-hot-add patch following this.
    Moreover, register_cpu calculates cpu->node_id by cpu_to_node() without regard
    to its 'struct node *root' argument.  This patch removes it.
    Also modify callers of register_cpu()/unregister_cpu, whose args are changed
    by register-cpu-remove-node-struct patch.
    [Brice.Goglin@ens-lyon.org: fix it]
    Signed-off-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
    Cc: Ashok Raj <ashok.raj@intel.com>
    Cc: Dave Hansen <haveblue@us.ibm.com>
    Signed-off-by: default avatarBrice Goglin <Brice.Goglin@ens-lyon.org>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
node.h 1.42 KB