linux-kernel - Re: [PATCH v2 0/2] ARM: decompressor: support AUTO

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Message-ID: <aYMZLWOlFOPTsnWx@shell.armlinux.org.uk>
Date: Wed, 4 Feb 2026 10:02:21 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Linus Walleij <linusw@...nel.org>
Cc: Marc Zyngier <maz@...nel.org>,
	"Christian Marangi (Ansuel)" <ansuelsmth@...il.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jonathan Corbet <corbet@....net>,
	"Mike Rapoport (IBM)" <rppt@...nel.org>,
	Eric DeVolder <eric.devolder@...cle.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Kees Cook <keescook@...omium.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...ainline.org>,
	John Crispin <john@...ozen.org>
Subject: Re: [PATCH v2 0/2] ARM: decompressor: support AUTO_ZRELADDR and
 appended DTB

On Wed, Feb 04, 2026 at 10:49:24AM +0100, Linus Walleij wrote:
> On Wed, Feb 4, 2026 at 10:24 AM Marc Zyngier <maz@...nel.org> wrote:
> 
> > > Another reason would be that appended DTB is in the same
> > > league as the GPIO sysfs despite we GPIO maintainers hate it:
> > > a feature users highly desire because it's easy and convenient
> > > and practical and quick and thus refuse to let us drop. Every time
> > > we try to deprecate it more we get a good beating.
> >
> > I don't think appended DTB is ABI. The GPIO sysfs definitely is.
> 
> The reason the GPIO sysfs is demanded is not so much because
> of ABI, like if applications are using it.
> 
> It's more about developers wanting to play with their systems
> interactively to figure things out or do makerspace projects
> using GPIO.
> 
> Likewise I think appended DTB is appealing to developers because...
> "it boots, ship it". ;)

Right, but what we have in the kernel works for those platforms that
it has been needed for. That's what it was for - a stop-gap for
transitioning 32-bit ARM to DT. It shouldn't be extended to new
platforms.

No one answered my question whether there was a regression or whether
this was for new platforms. Given that lack of engagement, I'm just
going to say a flat NO to this, since we don't seem to be able to
communicate effectively.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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