[PATCH] ramdisk blocksize Kconfig entry (bef317e3) · Commits · 戴 / test

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>

drivers/block/Kconfig

+10 −0

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

drivers/block/rd.c

+1 −1

Original line number	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
		* 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.

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