x86: extend e820 early_res support 32bit -fix #4

reserve_early pgdata for 32bit numa

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

1 files changed, 7 insertions, 2 deletions

diff --git a/arch/x86/mm/discontig_32.c b/arch/x86/mm/discontig_32.c
index 914ccf983687..47749727907e 100644
--- a/arch/x86/mm/discontig_32.c
+++ b/arch/x86/mm/discontig_32.c
@@ -159,8 +159,13 @@ static void __init allocate_pgdat(int nid)
         if (nid && node_has_online_mem(nid))
                 NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid];
         else {
-                NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(min_low_pfn));
-                min_low_pfn += PFN_UP(sizeof(pg_data_t));
+                unsigned long pgdat_phys;
+                pgdat_phys = find_e820_area(min_low_pfn<<PAGE_SHIFT,
+                                 max_low_pfn<<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");
         }
 }