init, Documentation: Remove ramdisk_blocksize mentions

The brd driver has never supported the ramdisk_blocksize kernel
parameter that was in the rd driver it replaced, so remove
mention of this parameter from comments and Documentation.

Commit 9db5579b ("rewrite rd") replaced rd with brd, keeping
a brd_blocksize variable in struct brd_device but never using it.

Commit a2cba291 ("brd: get rid of unused members from struct
brd_device") removed the unused variable.

Commit f5abc8e7 ("Documentation/blockdev/ramdisk.txt: updates")
removed mentions of ramdisk_blocksize from that file.
Signed-off-by: NRobert Elliott <elliott@hpe.com>
Signed-off-by: NJonathan Corbet <corbet@lwn.net>

Documentation/kernel-parameters.txt

@@ -3053,9 +3053,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 	raid=		[HW,RAID]
 			See Documentation/md.txt.
 
-	ramdisk_blocksize=	[RAM]
-			See Documentation/blockdev/ramdisk.txt.
-
 	ramdisk_size=	[RAM] Sizes of RAM disks in kilobytes
 			See Documentation/blockdev/ramdisk.txt.
 

init/do_mounts_rd.c

@@ -216,13 +216,6 @@ int __init rd_load_image(char *from)
 	/*
 	 * NOTE NOTE: nblocks is not actually blocks but
 	 * the number of kibibytes of data to load into a ramdisk.
-	 * So any ramdisk block size that is a multiple of 1KiB should
-	 * work when the appropriate ramdisk_blocksize is specified
-	 * on the command line.
-	 *
-	 * The default ramdisk_blocksize is 1KiB and it is generally
-	 * silly to use anything else, so make sure to use 1KiB
-	 * blocksize while generating ext2fs ramdisk-images.
 	 */
 	if (sys_ioctl(out_fd, BLKGETSIZE, (unsigned long)&rd_blocks) < 0)
 		rd_blocks = 0;