+done:
+ return ret;
+}
+
+/**
+ * bitmap_find_free_region - find a contiguous aligned mem region
+ * @bitmap: array of unsigned longs corresponding to the bitmap
+ * @bits: number of bits in the bitmap
+ * @order: region size (log base 2 of number of bits) to find
+ *
+ * Find a region of free (zero) bits in a @bitmap of @bits bits and
+ * allocate them (set them to one). Only consider regions of length
+ * a power (@order) of two, aligned to that power of two, which
+ * makes the search algorithm much faster.
+ *
+ * Return the bit offset in bitmap of the allocated region,
+ * or -errno on failure.
+ */
+int bitmap_find_free_region(unsigned long *bitmap, int bits, int order)
+{
+ int pos; /* scans bitmap by regions of size order */
+
+ for (pos = 0; pos < bits; pos += (1 << order))
+ if (__reg_op(bitmap, pos, order, REG_OP_ISFREE))
+ break;
+ if (pos == bits)
+ return -ENOMEM;
+ __reg_op(bitmap, pos, order, REG_OP_ALLOC);
+ return pos;