On Sun, Dec 16, 2018 at 2:19 PM David Miller [off-list ref] wrote:

From: Paolo Abeni <pabeni@redhat.com>
Date: Sun, 16 Dec 2018 19:55:40 +0100

quoted

Again, I messed it! I'm really sorry to waste everybody's time.
I was unable to give proper coverage with different configs. I tested
vs.:

CONFIG_IPV6=ymn
CONFIG_INET=yn

but

# CONFIG_RETPOLINE is not set

fooled me. The following patch should fix.

Please submit this formally with a proper signoff and let's see where
it goes.

I just happened to run in to this, too. Had to disable retpoline for
some unrelated issue.

The above draft patch fixed the compilation for me.