diff -ruN linux-2.5.35-vanilla/fs/buffer.c linux-2.5.35-mcp1-fullkernel/fs/buffer.c
--- linux-2.5.35-vanilla/fs/buffer.c		2002-09-16 10:47:01.000000000 +0200
+++ linux-2.5.35-mcp1-fullkernel/fs/buffer.c	2002-09-16 13:54:24.000000000 +0200
@@ -1628,6 +1628,7 @@
 		__brelse(old_bh);
 	}
 }
+EXPORT_SYMBOL(unmap_underlying_metadata);
 
 /*
  * NOTE! All mapped/uptodate combinations are valid: