Hi Stephen, thanks for reaching out and reporting the issue. I have
just sent the fix for review in net-next:
http://patchwork.ozlabs.org/project/netdev/patch/20200729181018.3221288-1-brianvv@google.com/

cheers,
Brian

On Wed, Jul 29, 2020 at 4:27 AM Stephen Rothwell [off-list ref] wrote:

Hi all,

After merging the net-next tree, today's linux-next build (i386 defconfig)
failed like this:

x86_64-linux-gnu-ld: net/core/fib_rules.o: in function `fib_rules_lookup':
fib_rules.c:(.text+0x5c6): undefined reference to `fib6_rule_match'
x86_64-linux-gnu-ld: fib_rules.c:(.text+0x5d8): undefined reference to `fib6_rule_match'
x86_64-linux-gnu-ld: fib_rules.c:(.text+0x64d): undefined reference to `fib6_rule_action'
x86_64-linux-gnu-ld: fib_rules.c:(.text+0x662): undefined reference to `fib6_rule_action'
x86_64-linux-gnu-ld: fib_rules.c:(.text+0x67a): undefined reference to `fib6_rule_suppress'
x86_64-linux-gnu-ld: fib_rules.c:(.text+0x68d): undefined reference to `fib6_rule_suppress'

Caused by commit

  b9aaec8f0be5 ("fib: use indirect call wrappers in the most common fib_rules_ops")

# CONFIG_IPV6_MULTIPLE_TABLES is not set

I have reverted that commit for today.

--
Cheers,
Stephen Rothwell