NAND support in JFFS2 isn't experimental any more.

fs/Kconfig

@@ -1133,21 +1133,16 @@ config JFFS2_FS_DEBUG
 	  messages at debug level 1 while the misbehaviour was occurring.
 
 config JFFS2_FS_NAND
-	bool "JFFS2 support for NAND flash (EXPERIMENTAL)"
-	depends on JFFS2_FS && EXPERIMENTAL
+	bool "JFFS2 support for NAND flash"
+	depends on JFFS2_FS
 	default n
 	help
-	  This enables the experimental support for NAND flash in JFFS2. NAND
-	  is a newer type of flash chip design than the traditional NOR flash,
-	  with higher density but a handful of characteristics which make it
-	  more interesting for the file system to use. Support for NAND flash
-	  is not yet complete and may corrupt data. For further information,
-	  including a link to the mailing list where details of the remaining
-	  work to be completed for NAND flash support can be found, see the 
-	  JFFS2 web site at <http://sources.redhat.com/jffs2>.
-
-	  Say 'N' unless you have NAND flash and you are willing to test and
-	  develop JFFS2 support for it.
+	  This enables the support for NAND flash in JFFS2. NAND is a newer
+	  type of flash chip design than the traditional NOR flash, with
+	  higher density but a handful of characteristics which make it more
+	  interesting for the file system to use.
+
+	  Say 'N' unless you have NAND flash.
 
 config JFFS2_COMPRESSION_OPTIONS
 	bool "Advanced compression options for JFFS2"