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diff --git a/nuttx/mm/kmm_heap/kmm_sbrk.c b/nuttx/mm/kmm_heap/kmm_sbrk.c
new file mode 100755
index 000000000..59dd810e9
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+++ b/nuttx/mm/kmm_heap/kmm_sbrk.c
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+/****************************************************************************
+ * mm/kmm_heap/kmm_sbrk.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_KERNEL) && defined(__KERNEL__)
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: kmm_sbrk
+ *
+ * Description:
+ *    The sbrk() function is used to change the amount of space allocated
+ *    for the calling process. The change is made by resetting the process'
+ *    break value and allocating the appropriate amount of space.  The amount
+ *    of allocated space increases as the break value increases.
+ *
+ *    The sbrk() function adds 'incr' bytes to the break value and changes
+ *    the allocated space accordingly. If incr is negative, the amount of
+ *    allocated space is decreased by incr bytes. The current value of the
+ *    program break is returned by sbrk(0). 
+ *
+ * Input Parameters:
+ *    incr - Specifies the number of bytes to add or to remove from the
+ *      space allocated for the process.
+ *
+ * Returned Value:
+ *    Upon successful completion, sbrk() returns the prior break value.
+ *    Otherwise, it returns (void *)-1 and sets errno to indicate the
+ *    error:
+ *
+ *      ENOMEM - The requested change would allocate more space than
+ *        allowed under system limits.
+ *      EAGAIN - The total amount of system memory available for allocation
+ *        to this process is temporarily insufficient. This may occur even
+ *        though the space requested was less than the maximum data segment
+ *        size.
+ *
+ ****************************************************************************/
+
+FAR void *kmm_sbrk(intptr_t incr)
+{
+  return mm_sbrk(&g_kmmheap, incr, UINTPTR_MAX);
+}
+
+#endif /* CONFIG_BUILD_KERNEL && __KERNEL__ */