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

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Message-ID: <2061e234534c4d406b92999b9ca5c7f2194e3c9d.camel@linux.ibm.com>
Date:   Thu, 02 Nov 2023 07:56:19 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Rob Landley <rob@...dley.net>,
        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>,
        initramfs <initramfs@...r.kernel.org>
Subject: Re: [RFC PATCH] rootfs: Use tmpfs for rootfs even if root= is given

On Wed, 2023-11-01 at 06:35 -0500, Rob Landley wrote:
> 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, the patch set wasn't upstreamed, but it certainly wasn't ignored. 
There were multiple comments.

Can you at least re-post "[PATCH 5/5] fix rootfstype=tmpfs" after
addressing the checkpatch.pl complaints?

-- 
thanks,

Mimi