Index: includes/install.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/install.inc,v
retrieving revision 1.112
diff -u -r1.112 install.inc
--- includes/install.inc	23 Sep 2009 15:04:34 -0000	1.112
+++ includes/install.inc	25 Sep 2009 13:57:42 -0000
@@ -93,12 +93,10 @@
  */
 function drupal_get_schema_versions($module) {
   $updates = &drupal_static(__FUNCTION__, NULL);
-  if (!isset($updates)) {
+  if (!isset($updates[$module])) {
     $updates = array();
     // Prepare regular expression to match all possible defined hook_update_N().
-    $modules = db_query("SELECT name FROM {system} WHERE type = 'module'")
-      ->fetchCol();
-    $regexp = '/^(?P<module>' . implode('|', $modules) . ')_update_(?P<version>\d+)$/';
+    $regexp = '/^(?P<module>.+)_update_(?P<version>\d+)$/';
     $functions = get_defined_functions();
     // Narrow this down to functions ending with an integer, since all
     // hook_update_N() functions end this way, and there are other