--- a/src/hotspot/share/logging/logTagSet.cpp	Tue Feb 13 15:48:23 2018 +0100
+++ b/src/hotspot/share/logging/logTagSet.cpp	Tue Feb 27 18:17:57 2018 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -118,17 +118,17 @@
   // Check that string fits in buffer; resize buffer if necessary
   int ret;
   if (prefix_len < vwrite_buffer_size) {
-    ret = os::log_vsnprintf(buf + prefix_len, sizeof(buf) - prefix_len, fmt, args);
+    ret = os::vsnprintf(buf + prefix_len, sizeof(buf) - prefix_len, fmt, args);
   } else {
     // Buffer too small. Just call printf to find out the length for realloc below.
-    ret = os::log_vsnprintf(buf, sizeof(buf), fmt, args);
+    ret = os::vsnprintf(buf, sizeof(buf), fmt, args);
   }
   assert(ret >= 0, "Log message buffer issue");
   if ((size_t)ret >= sizeof(buf)) {
     size_t newbuf_len = prefix_len + ret + 1;
     char* newbuf = NEW_C_HEAP_ARRAY(char, newbuf_len, mtLogging);
     prefix_len = _write_prefix(newbuf, newbuf_len);
-    ret = os::log_vsnprintf(newbuf + prefix_len, newbuf_len - prefix_len, fmt, saved_args);
+    ret = os::vsnprintf(newbuf + prefix_len, newbuf_len - prefix_len, fmt, saved_args);
     assert(ret >= 0, "Log message buffer issue");
     log(level, newbuf);
     FREE_C_HEAP_ARRAY(char, newbuf);