Hi Randy,

On Fri, 31 Jul 2020 08:53:09 -0700 Randy Dunlap [off-list ref] wrote:

on i386:

ld: net/core/fib_rules.o: in function `fib_rules_lookup':
fib_rules.c:(.text+0x16b8): undefined reference to `fib4_rule_match'
ld: fib_rules.c:(.text+0x16bf): undefined reference to `fib4_rule_match'
ld: fib_rules.c:(.text+0x170d): undefined reference to `fib4_rule_action'
ld: fib_rules.c:(.text+0x171e): undefined reference to `fib4_rule_action'
ld: fib_rules.c:(.text+0x1751): undefined reference to `fib4_rule_suppress'
ld: fib_rules.c:(.text+0x175d): undefined reference to `fib4_rule_suppress'

CONFIG_DECNET=y
CONFIG_DECNET_ROUTER=y

DECNET_ROUTER selects FIB_RULES.

I assume that CONFIG_IP_MULTIPLE_TABLES was not set for that build?

Caused by commit

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

from the net-next tree.
-- 
Cheers,
Stephen Rothwell