Remove valueless definition of hard-selected RAMFS option

Since CONFIG_RAMFS is currently hard-selected to "y", and since
Documentation/filesystems/ramfs-rootfs-initramfs.txt reads as follows:

"The amount of code required to implement ramfs is tiny, because all the
work is done by the existing Linux caching infrastructure.  Basically,
you're mounting the disk cache as a filesystem.  Because of this, ramfs is
not an optional component removable via menuconfig, since there would be
negligible space savings."

It seems pointless to leave this as a Kconfig entry.
Signed-off-by: NRobert P. J. Day <rpjday@mindspring.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

fs/Kconfig

@@ -999,20 +999,6 @@ config HUGETLBFS
 config HUGETLB_PAGE
 	def_bool HUGETLBFS
 
-config RAMFS
-	bool
-	default y
-	---help---
-	  Ramfs is a file system which keeps all files in RAM. It allows
-	  read and write access.
-
-	  It is more of an programming example than a useable file system.  If
-	  you need a file system which lives in RAM with limit checking use
-	  tmpfs.
-
-	  To compile this as a module, choose M here: the module will be called
-	  ramfs.
-
 config CONFIGFS_FS
 	tristate "Userspace-driven configuration filesystem (EXPERIMENTAL)"
 	depends on SYSFS && EXPERIMENTAL

fs/Makefile

@@ -72,7 +72,7 @@ obj-$(CONFIG_JBD)		+= jbd/
 obj-$(CONFIG_JBD2)		+= jbd2/
 obj-$(CONFIG_EXT2_FS)		+= ext2/
 obj-$(CONFIG_CRAMFS)		+= cramfs/
-obj-$(CONFIG_RAMFS)		+= ramfs/
+obj-y				+= ramfs/
 obj-$(CONFIG_HUGETLBFS)		+= hugetlbfs/
 obj-$(CONFIG_CODA_FS)		+= coda/
 obj-$(CONFIG_MINIX_FS)		+= minix/

fs/ramfs/Makefile

@@ -2,7 +2,7 @@
 # Makefile for the linux ramfs routines.
 #
 
-obj-$(CONFIG_RAMFS) += ramfs.o
+obj-y += ramfs.o
 
 file-mmu-y := file-nommu.o
 file-mmu-$(CONFIG_MMU) := file-mmu.o