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From: Mathieu OTHACEHE <m.othacehe@gmail.com>
To: Nicholas Piggin <npiggin@gmail.com>
Cc: Omar Sandoval <osandov@osandov.com>, Michal Marek <mmarek@suse.com>,
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        linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [GIT PULL] kbuild changes for v4.9-rc1
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Date: Mon, 17 Oct 2016 08:57:13 +0200
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Hi,

>> Reverting 784d5699eddc ("x86: move exports to actual definitions") fixes
>> it for me. This is with GCC 6.2.1, binutils 2.27, attached config.

I've had the same problem. Reverting your binutils from 2.27 to 2.26,
will also fix it. It seems ld 2.27 is not merging weak symbols from .o
files to vmlinux when linking.

Anyhow all crc for symbols exported from .S will be 0, so Nicholas
patch make sense.

Mathieu