[PATCH 06/14] adjust range when changing memory pageability

[Luca Dariz]

* vm/vm_map.c: if the start address is not in the map, try to find the
  nearest entry instead of failing.

This caused the initial vm_wire_all(host, task VM_WIRE_ALL) in glibc
startup to fail with KERN_NO_SPACE.
---
 vm/vm_map.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/vm/vm_map.c b/vm/vm_map.c
index 26e18676..4a5861e3 100644
--- a/vm/vm_map.c
+++ b/vm/vm_map.c
@@ -1774,13 +1774,24 @@ kern_return_t vm_map_pageable(
 
        if (!vm_map_lookup_entry(map, start, &start_entry)) {
                /*
-                *      Start address is not in map; this is fatal.
+                *      Start address is not in map; try to find the nearest 
entry
                 */
-               if (lock_map) {
-                       vm_map_unlock(map);
-               }
+               struct rbtree_node      *node;
+               node = rbtree_lookup_nearest(&map->hdr.tree, start,
+                                            vm_map_entry_cmp_lookup, 
RBTREE_LEFT);
+
+               if (node == NULL) {
+                       node = rbtree_lookup_nearest(&map->hdr.tree, start,
+                                                    vm_map_entry_cmp_lookup, 
RBTREE_RIGHT);
+                       if (node == NULL) {
+                               if (lock_map) {
+                                       vm_map_unlock(map);
+                               }
+                               return KERN_NO_SPACE;
+                       }
 
-               return KERN_NO_SPACE;
+               }
+               start_entry = rbtree_entry(node, struct vm_map_entry, 
tree_node);
        }
 
        /*
-- 
2.39.2