diff --git a/mm/kmm_heap/kmm_kernel.c b/mm/kmm_heap/kmm_kernel.c
deleted file mode 100644
index 0320ec1a53..0000000000
--- a/mm/kmm_heap/kmm_kernel.c
+++ /dev/null
@@ -1,111 +0,0 @@
-/****************************************************************************
- * mm/kmm_heap/kmm_kernel.c
- *
- *   Copyright (C) 2013-2014 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 <assert.h>
-
-#include <nuttx/kmalloc.h>
-
-#if ((defined(CONFIG_BUILD_PROTECTED) && defined(__KERNEL__)) || \
-      defined(CONFIG_BUILD_KERNEL)) && defined(CONFIG_MM_KERNEL_HEAP)
-
-/****************************************************************************
- * Public Functions
- ****************************************************************************/
-
-/****************************************************************************
- * Name: kmm_heapmember
- *
- * Description:
- *   Check if an address lies in the kernel heap.
- *
- * Input Parameters:
- *   mem - The address to check
- *
- * Returned Value:
- *   true if the address is a member of the kernel heap.  false if not
- *   not.  If the address is not a member of the kernel heap, then it
- *   must be a member of the user-space heap (unchecked)
- *
- ****************************************************************************/
-
-#ifdef CONFIG_DEBUG_FEATURES
-bool kmm_heapmember(FAR void *mem)
-{
-#if CONFIG_MM_REGIONS > 1
-  int i;
-
-  /* A valid address from the kernel heap for this region would have to lie
-   * between the region's two guard nodes.
-   */
-
-  for (i = 0; i < g_kmmheap.mm_nregions; i++)
-    {
-      if (mem > (FAR void *)g_kmmheap.mm_heapstart[i] &&
-          mem < (FAR void *)g_kmmheap.mm_heapend[i])
-        {
-          return true;
-        }
-    }
-
-  /* The address does not like any any region assigned to kernel heap */
-
-  return false;
-
-#else
-  /* A valid address from the kernel heap would have to lie between the
-   * two guard nodes.
-   */
-
-  if (mem > (FAR void *)g_kmmheap.mm_heapstart[0] &&
-      mem < (FAR void *)g_kmmheap.mm_heapend[0])
-    {
-      return true;
-    }
-
-  /* Otherwise, the address does not lie in the kernel heap */
-
-  return false;
-
-#endif
-}
-#endif
-
-#endif /* ((CONFIG_BUILD_PROTECTED && __KERNEL__) || CONFIG_BUILD_KERNEL)  && CONFIG_MM_KERNEL_HEAP*/