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Date: Tue, 13 Feb 2018 19:49:30 +0100
From: Christoph Biedl <linux-kernel.bfrz@manchmal.in-ulm.de>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: stable@vger.kernel.org, Nicholas Piggin <npiggin@gmail.com>
Subject: Re: Linux 4.9.81
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Christoph Biedl wrote...

> This seems to help:
(...)

Not enough, additionally CONFIG_LOCKUP_DETECTOR has to be set, else the linker will fail:

  LD      init/built-in.o
arch/powerpc/platforms/built-in.o: In function `.pnv_setup_arch':
setup.c:(.init.text+0x37ec): undefined reference to `.setup_rfi_flush'
Makefile:976: recipe for target 'vmlinux' failed
make[3]: *** [vmlinux] Error 1

    Christoph