linux-kernel - Re: [v5.4 stable] arm: stm32: Regression observed on "no-map" reserved memory region

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Date:   Tue, 20 Apr 2021 16:05:59 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     Alexandre TORGUE <alexandre.torgue@...s.st.com>,
        Quentin Perret <qperret@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>,
        stable <stable@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        KarimAllah Ahmed <karahmed@...zon.de>,
        Android Kernel Team <kernel-team@...roid.com>,
        Architecture Mailman List <boot-architecture@...ts.linaro.org>,
        Frank Rowand <frowand.list@...il.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [v5.4 stable] arm: stm32: Regression observed on "no-map"
 reserved memory region

On Tue, Apr 20, 2021 at 11:10 AM Ard Biesheuvel <ardb@...nel.org> wrote:
>
> On Tue, 20 Apr 2021 at 17:54, Rob Herring <robh+dt@...nel.org> wrote:
> >
> > On Tue, Apr 20, 2021 at 10:12 AM Alexandre TORGUE
> > <alexandre.torgue@...s.st.com> wrote:
> > >
> > >
> > >
> > > On 4/20/21 4:45 PM, Rob Herring wrote:
> > > > On Tue, Apr 20, 2021 at 9:03 AM Alexandre TORGUE
> > > > <alexandre.torgue@...s.st.com> wrote:
> > > >>
> > > >> Hi,
> > > >
> > > > Greg or Sasha won't know what to do with this. Not sure who follows
> > > > the stable list either. Quentin sent the patch, but is not the author.
> > > > Given the patch in question is about consistency between EFI memory
> > > > map boot and DT memory map boot, copying EFI knowledgeable folks would
> > > > help (Ard B for starters).
> > >
> > > Ok thanks for the tips. I add Ard in the loop.
> >
> > Sigh. If it was only Ard I was suggesting I would have done that
> > myself. Now everyone on the patch in question and relevant lists are
> > Cc'ed.
> >
>
> Thanks for the cc.
>
> > >
> > > Ard, let me know if other people have to be directly added or if I have
> > > to resend to another mailing list.
> > >
> > > thanks
> > > alex
> > >
> > > >
> > > >>
> > > >> Since v5.4.102 I observe a regression on stm32mp1 platform: "no-map"
> > > >> reserved-memory regions are no more "reserved" and make part of the
> > > >> kernel System RAM. This causes allocation failure for devices which try
> > > >> to take a reserved-memory region.
> > > >>
> > > >> It has been introduced by the following path:
> > > >>
> > > >> "fdt: Properly handle "no-map" field in the memory region
> > > >> [ Upstream commit 86588296acbfb1591e92ba60221e95677ecadb43 ]"
> > > >> which replace memblock_remove by memblock_mark_nomap in no-map case.
> > > >>
>
> Why was this backported? It doesn't look like a bugfix to me.

Probably because of commit 8a5a75e5e9e5 ("of/fdt: Make sure no-map
does not remove already reserved regions") which was in the same
series.

'Properly handle' implies before it was 'improperly handled', so
sounds like a fix.

Rob