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

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Date:	Tue, 16 Mar 2010 20:14:05 +0100
From:	Peter Korsgaard <jacmet@...site.dk>
To:	Greg KH <greg@...ah.com>
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

>>>>> "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.

 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?

-- 
Bye, Peter Korsgaard
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