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Date:   Fri, 26 Mar 2021 14:12:41 +1100 (AEDT)
From:   Finn Thain <fthain@telegraphics.com.au>
To:     Greg Ungerer <gerg@linux-m68k.org>
cc:     Geert Uytterhoeven <geert@linux-m68k.org>,
        Mike Rapoport <rppt@kernel.org>,
        linux-m68k <linux-m68k@lists.linux-m68k.org>,
        Stan Johnson <userm57@yahoo.com>,
        Angelo Dureghello <angelo@kernel-space.org>
Subject: Re: v5.11 (CONFIG_FLATMEM) boot crash
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On Thu, 25 Mar 2021, Geert Uytterhoeven wrote:

> On Thu, Mar 25, 2021 at 10:46 AM Mike Rapoport <rppt@kernel.org> wrote:
> >
> > There was a bug in the definition of ARCH_PFN_OFFSET that's quite 
> > probably causes the crashes when the kernel is located in the second 
> > memory bank.
> >
> > The fix was posted a while ago:
> >
> > https://lore.kernel.org/linux-m68k/20210228190828.392974-1-angelo@kernel-space.org
> >
> > Can you check if this helps?
> 
> Thank you!
> 
> I hadn't realized this applies to classic m68k, too.
> One more reason to annotate #else and #endif keywords, to avoid
> people guessing wrong...
> 
> Greg: This is in linux-next, and still destined for v5.12, I assume?
> Thanks!
> 

That message seems to have omitted 'Cc: stable@vger.kernel.org' and the 
commit in linux-next seems to lack a 'Fixes' tag:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/arch/m68k?id=06c5fa9b2168fcf185ca6807982bb97b72c0cfdb 
It may be worthwhile to add the missing tag before pushing.