x86: don't reallocate pgt for node0

kva ram already mapped right after away, so don't need to get that for low ram.
avoid wasting one copy of pgdat.

also add node id in early_res name in case we get it from find_e820_area.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/mm/discontig_32.c b/arch/x86/mm/discontig_32.c
index 42484d446d06c30d0dd877bfb2123f6e965aecba..e2f0dd13a45101f5a42d0b43cefa771a83dbfc96 100644 (file)
--- a/arch/x86/mm/discontig_32.c
+++ b/arch/x86/mm/discontig_32.c
@@ -156,17 +156,20 @@ static void __init propagate_e820_map_node(int nid)
  */
 static void __init allocate_pgdat(int nid)
 {
-       if (nid && node_has_online_mem(nid) && node_remap_start_vaddr[nid])
+       char buf[16];
+
+       if (node_has_online_mem(nid) && node_remap_start_vaddr[nid])
                NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid];
        else {
                unsigned long pgdat_phys;
                pgdat_phys = find_e820_area(min_low_pfn<<PAGE_SHIFT,
-                                (nid ? max_low_pfn:max_pfn_mapped)<<PAGE_SHIFT,
+                                max_pfn_mapped<<PAGE_SHIFT,
                                 sizeof(pg_data_t),
                                 PAGE_SIZE);
                NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(pgdat_phys>>PAGE_SHIFT));
-               reserve_early(pgdat_phys, pgdat_phys + sizeof(pg_data_t),
-                             "NODE_DATA");
+               memset(buf, 0, sizeof(buf));
+               sprintf(buf, "NODE_DATA %d",  nid);
+               reserve_early(pgdat_phys, pgdat_phys + sizeof(pg_data_t), buf);
        }
        printk(KERN_DEBUG "allocate_pgdat: node %d NODE_DATA %08lx\n",
                nid, (unsigned long)NODE_DATA(nid));