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diff --git a/nuttx/mm/umm_heap/umm_extend.c b/nuttx/mm/umm_heap/umm_extend.c
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+++ b/nuttx/mm/umm_heap/umm_extend.c
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+/****************************************************************************
+ * mm/umm_heap/umm_extend.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <nuttx/mm.h>
+
+#if !defined(CONFIG_BUILD_PROTECTED) || !defined(__KERNEL__)
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_BUILD_KERNEL)
+/* In the kernel build, there a multiple user heaps; one for each task
+ * group.  In this build configuration, the user heap structure lies
+ * in a reserved region at the beginning of the .bss/.data address
+ * space (CONFIG_ARCH_DATA_VBASE).  The size of that region is given by
+ * ARCH_DATA_RESERVE_SIZE
+ */
+
+#  include <nuttx/addrenv.h>
+#  define USR_HEAP (&ARCH_DATA_RESERVE->ar_usrheap)
+
+#else
+/* Otherwise, the user heap data structures are in common .bss */
+
+#  define USR_HEAP &g_mmheap
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: umm_extend
+ *
+ * Description:
+ *   Extend a region in the user heap by add a block of (virtually)
+ *   contiguous memory to the end of the heap.
+ *
+ ****************************************************************************/
+
+void umm_extend(FAR void *mem, size_t size, int region)
+{
+  mm_extend(USR_HEAP, mem, size, region);
+}
+
+#endif /* !CONFIG_BUILD_PROTECTED || !__KERNEL__ */