linux-kernel - Re: [PATCH] devtmpfs: support !CONFIG

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Date:	Tue, 16 Mar 2010 13:17:20 -0700
From:	Greg KH <greg@...ah.com>
To:	Peter Korsgaard <jacmet@...site.dk>
Cc:	kay.sievers@...y.org, gregkh@...e.de, linux-kernel@...r.kernel.org,
	linux-embedded@...r.kernel.org
Subject: Re: [PATCH] devtmpfs: support !CONFIG_TMPFS

On Tue, Mar 16, 2010 at 08:14:05PM +0100, Peter Korsgaard wrote:
> >>>>> "Greg" == Greg KH <greg@...ah.com> writes:
> 
> Hi,
> 
>  >> config DEVTMPFS
>  >> bool "Maintain a devtmpfs filesystem to mount at /dev"
>  >> -	depends on HOTPLUG && SHMEM && TMPFS
>  >> +	depends on HOTPLUG
>  >> help
>  >> This creates a tmpfs filesystem instance early at bootup.
>  >> In this filesystem, the kernel driver core maintains device
> 
>  Greg> With this patch, the Kconfig help text now is incorrect.
> 
>  Greg> Is there a way to explicitly call out in the Kconfig which way
>  Greg> devtmpfs is being created?  How about a multiple selection that
>  Greg> chooses either TMPFS or RAMFS, with the default being TMPFS?
> 
> I don't think that's needed - If CONFIG_TMPFS isn't set, then ramfs
> pretends to be tmpfs anyway, see mm/shmem.c:
> 
> static struct file_system_type tmpfs_fs_type = {
> 	.name		= "tmpfs",
> 	.get_sb		= ramfs_get_sb,
> 	.kill_sb	= kill_litter_super,
> };
> 
> So calling it tmpfs isn't really wrong.

Heh, wow, I didn't realize that.

>  Greg> So care to redo this so that people can easily determine what is going
>  Greg> to happen easier than this patch currently causes?
> 
> We can change the help text to say tmpfs/ramfs if you prefer - OK?

Yes, maybe with an explaination that if TMPFS is not set, ramfs will be
used.

thanks,

greg k-h
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