diff --git a/mm/Makefile b/mm/Makefile
index 2fa6d2c..74c85dd 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -10,7 +10,7 @@
 obj-y			:= bootmem.o filemap.o mempool.o oom_kill.o fadvise.o \
 			   page_alloc.o page-writeback.o pdflush.o \
 			   readahead.o slab.o swap.o truncate.o vmscan.o \
-			   prio_tree.o $(mmu-y)
+			   prio_tree.o util.o $(mmu-y)
 
 obj-$(CONFIG_SWAP)	+= page_io.o swap_state.o swapfile.o thrash.o
 obj-$(CONFIG_HUGETLBFS)	+= hugetlb.o
diff --git a/mm/slab.c b/mm/slab.c
index 76b092b..1c46c63 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3053,20 +3053,6 @@
 EXPORT_SYMBOL(kmem_cache_free);
 
 /**
- * kzalloc - allocate memory. The memory is set to zero.
- * @size: how many bytes of memory are required.
- * @flags: the type of memory to allocate.
- */
-void *kzalloc(size_t size, gfp_t flags)
-{
-	void *ret = kmalloc(size, flags);
-	if (ret)
-		memset(ret, 0, size);
-	return ret;
-}
-EXPORT_SYMBOL(kzalloc);
-
-/**
  * kfree - free previously allocated memory
  * @objp: pointer returned by kmalloc.
  *
@@ -3659,26 +3645,3 @@
 
 	return obj_reallen(page_get_cache(virt_to_page(objp)));
 }
-
-
-/*
- * kstrdup - allocate space for and copy an existing string
- *
- * @s: the string to duplicate
- * @gfp: the GFP mask used in the kmalloc() call when allocating memory
- */
-char *kstrdup(const char *s, gfp_t gfp)
-{
-	size_t len;
-	char *buf;
-
-	if (!s)
-		return NULL;
-
-	len = strlen(s) + 1;
-	buf = kmalloc(len, gfp);
-	if (buf)
-		memcpy(buf, s, len);
-	return buf;
-}
-EXPORT_SYMBOL(kstrdup);
diff --git a/mm/util.c b/mm/util.c
new file mode 100644
index 0000000..5f4bb59
--- /dev/null
+++ b/mm/util.c
@@ -0,0 +1,39 @@
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/module.h>
+
+/**
+ * kzalloc - allocate memory. The memory is set to zero.
+ * @size: how many bytes of memory are required.
+ * @flags: the type of memory to allocate.
+ */
+void *kzalloc(size_t size, gfp_t flags)
+{
+	void *ret = kmalloc(size, flags);
+	if (ret)
+		memset(ret, 0, size);
+	return ret;
+}
+EXPORT_SYMBOL(kzalloc);
+
+/*
+ * kstrdup - allocate space for and copy an existing string
+ *
+ * @s: the string to duplicate
+ * @gfp: the GFP mask used in the kmalloc() call when allocating memory
+ */
+char *kstrdup(const char *s, gfp_t gfp)
+{
+	size_t len;
+	char *buf;
+
+	if (!s)
+		return NULL;
+
+	len = strlen(s) + 1;
+	buf = kmalloc(len, gfp);
+	if (buf)
+		memcpy(buf, s, len);
+	return buf;
+}
+EXPORT_SYMBOL(kstrdup);