linux-kernel - Re: [PATCH 0/2] Fix CMDLINE_EXTEND handling for FDT "bootargs"

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Date:   Tue, 2 Mar 2021 09:12:51 -0800
From:   Daniel Walker <danielwa@...co.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Will Deacon <will@...nel.org>,
        Chris Packham <chris.packham@...iedtelesis.co.nz>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Max Uvarov <muvarov@...il.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Doug Anderson <dianders@...omium.org>,
        Tyler Hicks <tyhicks@...ux.microsoft.com>,
        Frank Rowand <frowand.list@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Palmer Dabbelt <palmer@...belt.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Android Kernel Team <kernel-team@...roid.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree@...r.kernel.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH 0/2] Fix CMDLINE_EXTEND handling for FDT "bootargs"

On Mon, Mar 01, 2021 at 11:26:14AM -0600, Rob Herring wrote:
> +PPC folks and Daniel W
> 
> On Mon, Mar 1, 2021 at 8:42 AM Will Deacon <will@...nel.org> wrote:
> >
> > On Mon, Mar 01, 2021 at 08:19:32AM -0600, Rob Herring wrote:
> > > On Thu, Feb 25, 2021 at 6:59 AM Will Deacon <will@...nel.org> wrote:
> > > > We recently [1] enabled support for CMDLINE_EXTEND on arm64, however
> > > > when I started looking at replacing Android's out-of-tree implementation [2]
> > >
> > > Did anyone go read the common, reworked version of all this I
> > > referenced that supports prepend and append. Here it is again[1].
> > > Maybe I should have been more assertive there and said 'extend' is
> > > ambiguous.
> >
> > I tried reading that, but (a) most of the series is not in the mailing list
> > archives and (b) the patch that _is_ doesn't touch CMDLINE_EXTEND at all.
> > Right now the code in mainline does the opposite of what it's documented to
> > do.
> 
> Actually, there is a newer version I found:
> 
> https://lore.kernel.org/linuxppc-dev/1551469472-53043-1-git-send-email-danielwa@cisco.com/
> https://lore.kernel.org/linuxppc-dev/1551469472-53043-2-git-send-email-danielwa@cisco.com/
> https://lore.kernel.org/linuxppc-dev/1551469472-53043-3-git-send-email-danielwa@cisco.com/
> 
> (Once again, there's some weird threading going on)
> 

I'm happy to work with anyone to resubmit the changes. We currently use the
changes in Cisco, and we have used them for many years.

I was planning to update and resubmit since someone has recently inquired about
why it wasn't upstream.

Daniel