linux-kernel - Re: [PATCH stable 5.10 0/3] ARM FDT relocation backports

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Message-ID: <YJkBCMUpKUax0idB@kroah.com>
Date:   Mon, 10 May 2021 11:46:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Ard Biesheuvel <ardb@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        "# 3.4.x" <stable@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        Russell King <linux@...linux.org.uk>,
        Nicolas Pitre <nico@...xnic.net>,
        Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nick Desaulniers <ndesaulniers@...ogle.com>,
        Joe Perches <joe@...ches.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Tian Tao <tiantao6@...ilicon.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH stable 5.10 0/3] ARM FDT relocation backports

On Mon, May 10, 2021 at 11:37:01AM +0200, Linus Walleij wrote:
> On Mon, May 10, 2021 at 9:43 AM Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> > On Sun, May 09, 2021 at 06:22:05PM -0700, Florian Fainelli wrote:
> 
> > > This does not qualify as a regression in that it has never worked for
> > > the specific platform that I have shown above until your 3 commits came
> > > in and fixed that particular FDT placement. To me this qualifies as a
> > > bug fix, and given that the 3 (now 4) commits applied without hunks, it
> > > seems reasonable to me to back port those to stable.
> >
> > As this isn't a regression, why not just use 5.12 on these platforms?
> > Why is 5.4 and 5.10 needed?
> 
> Actually I think it *is* a regression, but not a common one. The bug that
> Ard is fixing can appear when the kernel grows over a certain size.
> 
> If a user compile in a new set of functionality and the kernel size
> reach a tripping point so that the DTB ends up just outside the 1:1
> lowmem map, disaster strikes.
> 
> This has been a long standing mysterious bug for people using
> attached device trees.

Ok, then feel free to ack them when they get resubmitted.

thanks,

greg k-h