1 files changed, 24 insertions, 0 deletions

diff --git a/mm/slab.c b/mm/slab.c
index 93cbbbb39f42..122d031baab2 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -92,6 +92,7 @@
 #include        <linux/sysctl.h>
 #include        <linux/module.h>
 #include        <linux/rcupdate.h>
+#include        <linux/string.h>
 
 #include        <asm/uaccess.h>
 #include        <asm/cacheflush.h>
@@ -3082,3 +3083,26 @@ unsigned int ksize(const void *objp)
 
         return size;
 }
+
+
+/*
+ * 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, int 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);