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Commit bef317e3 authored Jul 14, 2006 by Nathan Scott Committed by Linus Torvalds Jul 14, 2006

[PATCH] ramdisk blocksize Kconfig entry



Make the ramdisk blocksize configurable at kernel compilation time rather
than only at boot or module load time, like a couple of the other ramdisk
options.  I found this handy awhile back but thought little of it, until
recently asked by a few of the testing folks here to be able to do the same
thing for their automated test setups.

The Kconfig comment is largely lifted from comments in rd.c, and hopefully
this will increase the chances of making folks aware that the default value
often isn't a great choice here (for increasing values of PAGE_SIZE, even
moreso).

Signed-off-by: Nathan Scott <nathans@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

parent 086626a7

drivers/block/Kconfig

+10 −0

Original line number	Original line	Diff line number	Diff line
	@@ -400,6 +400,16 @@ config BLK_DEV_RAM_SIZE
	what are you doing. If you are using IBM S/390, then set this to		what are you doing. If you are using IBM S/390, then set this to
	8192.		8192.

			config BLK_DEV_RAM_BLOCKSIZE
			int "Default RAM disk block size (bytes)"
			depends on BLK_DEV_RAM
			default "1024"
			help
			The default value is 1024 kilobytes. PAGE_SIZE is a much more
			efficient choice however. The default is kept to ensure initrd
			setups function - apparently needed by the rd_load_image routine
			that supposes the filesystem in the image uses a 1024 blocksize.

	config BLK_DEV_INITRD		config BLK_DEV_INITRD
	bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"		bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
	depends on BROKEN \|\| !FRV		depends on BROKEN \|\| !FRV

drivers/block/rd.c

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -84,7 +84,7 @@ int rd_size = CONFIG_BLK_DEV_RAM_SIZE; /* Size of the RAM disks */
	* behaviour. The default is still BLOCK_SIZE (needed by rd_load_image that		* behaviour. The default is still BLOCK_SIZE (needed by rd_load_image that
	* supposes the filesystem in the image uses a BLOCK_SIZE blocksize).		* supposes the filesystem in the image uses a BLOCK_SIZE blocksize).
	*/		*/
	static int rd_blocksize = BLOCK_SIZE; /* blocksize of the RAM disks */		static int rd_blocksize = CONFIG_BLK_DEV_RAM_BLOCKSIZE;

	/*		/*
	* Copyright (C) 2000 Linus Torvalds.		* Copyright (C) 2000 Linus Torvalds.