1 files changed, 39 insertions, 10 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f32fae3121f0..eee5ba7509c1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3461,6 +3461,11 @@ void __paginginit free_area_init_node(int nid, struct pglist_data *pgdat,
         calculate_node_totalpages(pgdat, zones_size, zholes_size);
 
         alloc_node_mem_map(pgdat);
+#ifdef CONFIG_FLAT_NODE_MEM_MAP
+        printk(KERN_DEBUG "free_area_init_node: node %d, pgdat %08lx, node_mem_map %08lx\n",
+                nid, (unsigned long)pgdat,
+                (unsigned long)pgdat->node_mem_map);
+#endif
 
         free_area_init_core(pgdat, zones_size, zholes_size);
 }
@@ -3549,25 +3554,49 @@ void __init add_active_range(unsigned int nid, unsigned long start_pfn,
 /**
  * shrink_active_range - Shrink an existing registered range of PFNs
  * @nid: The node id the range is on that should be shrunk
- * @old_end_pfn: The old end PFN of the range
  * @new_end_pfn: The new PFN of the range
  *
  * i386 with NUMA use alloc_remap() to store a node_mem_map on a local node.
- * The map is kept at the end physical page range that has already been
- * registered with add_active_range(). This function allows an arch to shrink
- * an existing registered range.
+ * The map is kept near the end physical page range that has already been
+ * registered. This function allows an arch to shrink an existing registered
+ * range.
  */
-void __init shrink_active_range(unsigned int nid, unsigned long old_end_pfn,
-                                                unsigned long new_end_pfn)
+void __init shrink_active_range(unsigned int nid, unsigned long new_end_pfn)
 {
-        int i;
+        int i, j;
+        int removed = 0;
 
         /* Find the old active region end and shrink */
-        for_each_active_range_index_in_nid(i, nid)
-                if (early_node_map[i].end_pfn == old_end_pfn) {
+        for_each_active_range_index_in_nid(i, nid) {
+                if (early_node_map[i].start_pfn >= new_end_pfn) {
+                        /* clear it */
+                        early_node_map[i].end_pfn = 0;
+                        removed = 1;
+                        continue;
+                }
+                if (early_node_map[i].end_pfn > new_end_pfn) {
                         early_node_map[i].end_pfn = new_end_pfn;
-                        break;
+                        continue;
                 }
+        }
+
+        if (!removed)
+                return;
+
+        /* remove the blank ones */
+        for (i = nr_nodemap_entries - 1; i > 0; i--) {
+                if (early_node_map[i].nid != nid)
+                        continue;
+                if (early_node_map[i].end_pfn)
+                        continue;
+                /* we found it, get rid of it */
+                for (j = i; j < nr_nodemap_entries - 1; j++)
+                        memcpy(&early_node_map[j], &early_node_map[j+1],
+                                sizeof(early_node_map[j]));
+                j = nr_nodemap_entries - 1;
+                memset(&early_node_map[j], 0, sizeof(early_node_map[j]));
+                nr_nodemap_entries--;
+        }
 }
 
 /**