The zonelist structure is part of the pgdat, which is zeroed by every architecture. Clearing it again is not necessary. *Not* clearing it like this allows the code to be reused by the memory hotplug code. Signed-off-by: Dave Hansen --- memhotplug-dave/mm/page_alloc.c | 8 -------- 1 files changed, 8 deletions(-) diff -puN mm/page_alloc.c~A2.2-dont-memset-zonelists mm/page_alloc.c --- memhotplug/mm/page_alloc.c~A2.2-dont-memset-zonelists 2004-12-10 13:52:26.000000000 -0800 +++ memhotplug-dave/mm/page_alloc.c 2004-12-10 13:52:26.000000000 -0800 @@ -1436,13 +1436,6 @@ static void __init build_zonelists(pg_da zonelist->zones[0] = NULL; } - /* initialize zonelists */ - for (i = 0; i < GFP_ZONETYPES; i++) { - zonelist = pgdat->node_zonelists + i; - memset(zonelist, 0, sizeof(*zonelist)); - zonelist->zones[0] = NULL; - } - /* NUMA-aware ordering of nodes */ local_node = pgdat->node_id; load = numnodes; @@ -1488,7 +1481,6 @@ static void __init build_zonelists(pg_da struct zonelist *zonelist; zonelist = pgdat->node_zonelists + i; - memset(zonelist, 0, sizeof(*zonelist)); j = 0; k = ZONE_NORMAL; _