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Date:   Tue, 9 Aug 2022 19:12:54 +0200
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Michael Bestas <mkbestas@gmail.com>
Cc:     stable@vger.kernel.org, Hsin-Yi Wang <hsinyi@chromium.org>,
        Stephen Boyd <swboyd@chromium.org>,
        Mike Rapoport <rppt@linux.ibm.com>,
        Will Deacon <will@kernel.org>
Subject: Re: [PATCH] arm64: map FDT as RW for early_init_dt_scan()
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References: <20220809145624.1819905-1-mkbestas@gmail.com>
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On Tue, Aug 09, 2022 at 05:56:24PM +0300, Michael Bestas wrote:
> From: Hsin-Yi Wang <hsinyi@chromium.org>
> 
> commit e112b032a72c78f15d0c803c5dc6be444c2e6c66 upstream.
> 
> Currently in arm64, FDT is mapped to RO before it's passed to
> early_init_dt_scan(). However, there might be some codes
> (eg. commit "fdt: add support for rng-seed") that need to modify FDT
> during init. Map FDT to RO after early fixups are done.
> 
> Cc: stable@vger.kernel.org # 4.9+
> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
> Reviewed-by: Stephen Boyd <swboyd@chromium.org>
> Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>
> Signed-off-by: Will Deacon <will@kernel.org>
> [mkbestas: fixed trivial conflicts for 4.9 backport]
> Signed-off-by: Michael Bestas <mkbestas@gmail.com>
> ---
>  arch/arm64/include/asm/mmu.h |  2 +-
>  arch/arm64/kernel/kaslr.c    |  5 +----
>  arch/arm64/kernel/setup.c    |  9 ++++++++-
>  arch/arm64/mm/mmu.c          | 15 +--------------
>  4 files changed, 11 insertions(+), 20 deletions(-)

What about 4.14.y and newer?

thanks,

greg k-h