linux-kernel - Re: [PATCH] use tmpfs for rootfs v3

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Date:	Sun, 19 Oct 2008 14:12:51 -0400
From:	"Mike Frysinger" <vapier.adi@...il.com>
To:	"Bodo Eggert" <7eggert@....de>
Cc:	jeffschroeder@...puter.org,
	"Geert Uytterhoeven" <geert@...ux-m68k.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] use tmpfs for rootfs v3

On Fri, Oct 17, 2008 at 07:16, Bodo Eggert wrote:
> This patch allows chosing tmpfs instead of ramfs for the root filesystem.
> Having tmpfs is usefull for running systems from RAM, because it does not
> risk deadlocking the system and possibly allows swapping. Using tmpfs
> increases the kernel by 10 bytes on x86_64.

great option, thanks

> --- linux-2.6.27.2-numlock/fs/Kconfig   2008-10-10 13:18:34.000000000 +0200
> +++ linux-2.6.27.3-tmpfs/fs/Kconfig     2008-10-11 15:42:21.000000000 +0200
> @@ -953,6 +953,27 @@ config TMPFS_POSIX_ACL
>
>          If you don't know what Access Control Lists are, say N.
>
> +config TMPFS_ROOT
> +       bool "Use tmpfs instrad of ramfs for initramfs"
> +       depends on TMPFS && SHMEM
> +       default n
> +       help
> +         This replaces the ramfs used for unpacking the cpio images
> +         with tmpfs.
> +
> +         If unsure, say N

this should be init/Kconfig and depend on BLK_DEV_INITRD i think.  and
then update the comment to talk about the initial filesystem rather
than cpio images.

> +config RAMFS
> +       bool "Ramfs file system support" if TMPFS_ROOT

if you have initramfs support disabled, then you should be able to
disable RAMFS as well.  so perhaps the depend should read like:
if BLK_DEV_INITRD && TMPFS_ROOT || !BLK_DEV_INITRD
-mike
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