diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h
new file mode 100644
index 0000000..32ee6eb
--- /dev/null
+++ b/include/linux/genalloc.h
@@ -0,0 +1,73 @@
+/*
+ * Basic general purpose allocator for managing special purpose
+ * memory, for example, memory that is not managed by the regular
+ * kmalloc/kfree interface.  Uses for this includes on-device special
+ * memory, uncached memory etc.
+ *
+ * It is safe to use the allocator in NMI handlers and other special
+ * unblockable contexts that could otherwise deadlock on locks.  This
+ * is implemented by using atomic operations and retries on any
+ * conflicts.  The disadvantage is that there may be livelocks in
+ * extreme cases.  For better scalability, one allocator can be used
+ * for each CPU.
+ *
+ * The lockless operation only works if there is enough memory
+ * available.  If new memory is added to the pool a lock has to be
+ * still taken.  So any user relying on locklessness has to ensure
+ * that sufficient memory is preallocated.
+ *
+ * The basic atomic operation of this allocator is cmpxchg on long.
+ * On architectures that don't have NMI-safe cmpxchg implementation,
+ * the allocator can NOT be used in NMI handler.  So code uses the
+ * allocator in NMI handler should depend on
+ * CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG.
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2.  See the file COPYING for more details.
+ */
+
+
+#ifndef __GENALLOC_H__
+#define __GENALLOC_H__
+struct gen_pool {
+	spinlock_t lock;
+	struct list_head chunks;	
+	int min_alloc_order;		
+};
+
+struct gen_pool_chunk {
+	struct list_head next_chunk;	
+	atomic_t avail;
+	phys_addr_t phys_addr;		
+	unsigned long start_addr;	
+	unsigned long end_addr;		
+	unsigned long bits[0];		
+};
+
+extern struct gen_pool *gen_pool_create(int, int);
+extern phys_addr_t gen_pool_virt_to_phys(struct gen_pool *pool, unsigned long);
+extern int gen_pool_add_virt(struct gen_pool *, unsigned long, phys_addr_t,
+			     size_t, int);
+static inline int gen_pool_add(struct gen_pool *pool, unsigned long addr,
+			       size_t size, int nid)
+{
+	return gen_pool_add_virt(pool, addr, -1, size, nid);
+}
+extern void gen_pool_destroy(struct gen_pool *);
+extern void gen_pool_free(struct gen_pool *, unsigned long, size_t);
+extern void gen_pool_for_each_chunk(struct gen_pool *,
+	void (*)(struct gen_pool *, struct gen_pool_chunk *, void *), void *);
+extern size_t gen_pool_avail(struct gen_pool *);
+extern size_t gen_pool_size(struct gen_pool *);
+
+unsigned long __must_check
+gen_pool_alloc_aligned(struct gen_pool *pool, size_t size,
+                       unsigned alignment_order);
+
+static inline unsigned long __must_check
+gen_pool_alloc(struct gen_pool *pool, size_t size)
+{
+        return gen_pool_alloc_aligned(pool, size, 0);
+}
+
+#endif