linux-kernel - Re: [RFC PATCH] rootfs: Use tmpfs for rootfs even if root= is given

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Date:   Wed, 1 Nov 2023 06:35:37 -0500
From:   Rob Landley <rob@...dley.net>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Stefan Berger <stefanb@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org,
        "Milton D. Miller II" <mdmii@...look.com>,
        Jeff Layton <jlayton@...nel.org>, Jens Axboe <axboe@...nel.dk>,
        Jim Cromie <jim.cromie@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "H. Peter Anvin" <hpa@...or.com>, Mimi Zohar <zohar@...ux.ibm.com>
Subject: Re: [RFC PATCH] rootfs: Use tmpfs for rootfs even if root= is given

On 10/31/23 11:56, Greg Kroah-Hartman wrote:
> On Tue, Oct 31, 2023 at 11:44:17AM -0400, Stefan Berger wrote:
>> rootfs currently does not use tmpfs if the root= boot option is passed
>> even though the documentation about rootfs (added in 6e19eded3684) in
>> Documentation/filesystems/ramfs-rootfs-initramfs.rst states:
>> 
>>   If CONFIG_TMPFS is enabled, rootfs will use tmpfs instead of ramfs by
>>   default.  To force ramfs, add "rootfstype=ramfs" to the kernel command
>>   line.
> 
> At this point in time, is there even any difference between ramfs and
> tmpfs anymore?  Why would you want to choose one over the other here?

I submitted a patch to fix this to the list multiple times, which got ignored as
always. Most recently here:

https://lore.kernel.org/lkml/8244c75f-445e-b15b-9dbf-266e7ca666e2@landley.net/

Rob