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

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Message-ID: <2023103159-punctuate-amount-f09d@gregkh>
Date:   Tue, 31 Oct 2023 17:56:24 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Stefan Berger <stefanb@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org,
        "Milton D. Miller II" <mdmii@...look.com>,
        Rob Landley <rob@...dley.net>,
        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 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?

thanks,

greg k-h