linux-kernel - Re: [PATCH] use initmpfs even if there's root= cmdline

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Message-ID: <20131213023814.GA5519@dhcp-16-126.nay.redhat.com>
Date:	Fri, 13 Dec 2013 10:38:14 +0800
From:	Dave Young <dyoung@...hat.com>
To:	akpm@...ux-foundation.org, rob@...dley.net,
	gregkh@...uxfoundation.org, grant.likely@...retlab.ca,
	sebastian.capella@...aro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] use initmpfs even if there's root= cmdline

On 12/12/13 at 05:25pm, Dave Young wrote:
> 
> Current code use ramfs instead of tmpfs for stub when root= defined.
> 
> But for real use case with initramfs, usually there's like cmdline like
> root=UUID=$UUID the root dev is the real device. For that case we have
> no way to use initmpfs, thus this patch removes the limitation so tmpfs
> can benefit more people.
> 
> The logic become:
> if CONFIG_TMPFS && rootfstype is not ramfs
>     use tmpfs
> else
>     use ramfs
> 

Discussed with Vivek Goyal about the kdump use case, I missed one thing that
tmpfs has default size limit though we can tune it.

So I will think more about it, will address this later, please ignore this
patch.

Thanks
Dave
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