- Patch #383318 by mr.baileys: incorrect memory shortage warning when memory limit is unlimited.

modules/system/system.install

@@ -65,10 +65,10 @@ function system_requirements($phase) {
   $memory_limit = ini_get('memory_limit');
   $requirements['php_memory_limit'] = array(
     'title' => $t('PHP memory limit'),
-    'value' => $memory_limit,
+    'value' => $memory_limit == -1 ? t('-1 (Unlimited)') : $memory_limit,
   );
 
-  if ($memory_limit && parse_size($memory_limit) < parse_size(DRUPAL_MINIMUM_PHP_MEMORY_LIMIT)) {
+  if ($memory_limit && $memory_limit != -1 && parse_size($memory_limit) < parse_size(DRUPAL_MINIMUM_PHP_MEMORY_LIMIT)) {
     $description = '';
     if ($phase == 'install') {
       $description = $t('Consider increasing your PHP memory limit to %memory_minimum_limit to help prevent errors in the installation process.', array('%memory_minimum_limit' => DRUPAL_MINIMUM_PHP_MEMORY_LIMIT));