• KAMEZAWA Hiroyuki's avatar
    mm/memory_hotplug.c: fix building of node hotplug zonelist · 959ecc48
    KAMEZAWA Hiroyuki authored
    During memory hotplug we refresh zonelists when we online a page in a new
    zone.  It means that the node's zonelist is not initialized until pages
    are onlined.  So for example, "nid" passed by MEM_GOING_ONLINE notifier
    will point to NODE_DATA(nid) which has no zone fallback list.  Moreover,
    if we hot-add cpu-only nodes, alloc_pages() will do no fallback.
    
    This patch makes a zonelist when a new pgdata is available.
    
    Note: in production, at fujitsu, memory should be onlined before cpu
          and our server didn't have any memory-less nodes and had no problems.
    
          But recent changes in MEM_GOING_ONLINE+page_cgroup
          will access not initialized zonelist of node.
          Anyway, there are memory-less node and we need some care.
    Signed-off-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    Cc: Mel Gorman <mel@csn.ul.ie>
    Cc: Dave Hansen <dave@linux.vnet.ibm.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    959ecc48
memory_hotplug.c 22.4 KB