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

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Message-ID: <YIF0EIXylUJzIsTS@google.com>
Date:   Thu, 22 Apr 2021 13:03:12 +0000
From:   Quentin Perret <qperret@...gle.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Ard Biesheuvel <ardb@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Alexandre TORGUE <alexandre.torgue@...s.st.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>,
        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 Wednesday 21 Apr 2021 at 08:17:28 (-0700), Florian Fainelli wrote:
> 5.10.31 works correctly and shows the following for my platform:
> 
> 40000000-fdffefff : System RAM
>   40200000-40eaffff : Kernel code
>   40eb0000-4237ffff : reserved
>   42380000-425affff : Kernel data
>   45000000-450fffff : reserved
>   47000000-4704ffff : reserved
>   4761e000-47624fff : reserved
>   f8c00000-fdbfffff : reserved
> fdfff000-ffffffff : reserved
> 100000000-13fffffff : System RAM
>   13b000000-13effffff : reserved
>   13f114000-13f173fff : reserved
>   13f174000-13f774fff : reserved
>   13f775000-13f7e8fff : reserved
>   13f7eb000-13f7ecfff : reserved
>   13f7ed000-13f7effff : reserved
>   13f7f0000-13fffffff : reserved

OK, so if we're confident this works from 5.10 onwards, I would suggest
to follow Ard's original suggestion to revert this patch from older
LTSes as we're clearly missing something there.

Thanks,
Quentin