BLK_DEV_INITRD: do not require BLK_DEV_RAM=y

[Zdenek Pavlas <pavlas@nextra.cz>]

Hello,

Initramfs initrd images do not need a ramdisk device, so remove this restriction 
in Kconfig.  BLK_DEV_RAM=n saves about 13k on i386.  Also without ramdisk device 
there's no need for "dry run", so initramfs unpacks much faster.

People using cramfs, squashfs, or gzipped ext2/minix initrd images are probably 
smart enough not to turn off ramdisk support by accident.

--
Zdenek Pavlas

--- linux-2.6.15.6/drivers/block/Kconfig	2006-03-05 20:07:54.000000000 +0100
+++ linux/drivers/block/Kconfig	2006-03-10 11:47:35.666970832 +0100
@@ -400,7 +400,6 @@
 
 config BLK_DEV_INITRD
 	bool "Initial RAM disk (initrd) support"
-	depends on BLK_DEV_RAM=y
 	help
 	  The initial RAM disk is a RAM disk that is loaded by the boot loader
 	  (loadlin or lilo) and that is mounted as root before the normal boot
--- linux-2.6.15.6/init/initramfs.c	2006-03-05 20:07:54.000000000 +0100
+++ linux/init/initramfs.c	2006-03-10 11:59:50.000000000 +0100
@@ -484,6 +484,7 @@
 		panic(err);
 #ifdef CONFIG_BLK_DEV_INITRD
 	if (initrd_start) {
+#ifdef CONFIG_BLK_DEV_RAM
 		int fd;
 		printk(KERN_INFO "checking if image is initramfs...");
 		err = unpack_to_rootfs((char *)initrd_start,
@@ -503,6 +504,15 @@
 			sys_close(fd);
 			free_initrd();
 		}
+#else
+		printk(KERN_INFO "Unpacking initramfs...");
+		err = unpack_to_rootfs((char *)initrd_start,
+			initrd_end - initrd_start, 0);
+		if (err)
+			panic(err);
+		printk(" done\n");
+		free_initrd();
+#endif
 	}
 #endif
 }