Bugzilla Bug 153524

Overview:

Kernel 2.6.18-gentoo-r1 fails to compile module xt_physdev.c

Actual results:

[...]

  GEN     .version
  CHK     include/linux/compile.h
  UPD     include/linux/compile.h
  CC      init/version.o
  LD      init/built-in.o
  LD      .tmp_vmlinux1
net/built-in.o: In function `checkentry':
xt_physdev.c:(.text+0x1fba5): undefined reference to `brnf_deferred_hooks'
xt_physdev.c:(.text+0x1fbcf): undefined reference to `brnf_deferred_hooks'
make: *** [.tmp_vmlinux1] Error 1

Additional info:

xt_physdev.c is apparently the implementation of
CONFIG_NETFILTER_XT_MATCH_PHYSDEV ("physdev" match support)
which was enabled in the kernel config.

xt_physdev.c includes <linux/netfilter_bridge.h> and in
netfilter_bridge.h the declaration
"extern int brnf_deferred_hooks;" is a conditional of
CONFIG_BRIDGE_NETFILTER (Bridged IP/ARP packets filtering)
but this was also enabled in the kernel config.

Disabling CONFIG_NETFILTER_XT_MATCH_PHYSDEV makes the
kernel compile.

Please attach your .config

Created an attachment (id=100896) [edit]
kernel .config file

I experience the same problem as Rumi reported, with the same workaround
(disabeling "physdev" match support), but using gentoo-sources-2.6.18-r2 which
has been declared stable yesterday.

Created an attachment (id=101679) [edit]
kernel .config for 2.6.18-gentoo-r2

Confirm the same problem with gentoo-sources-2.6.18-r2.
Im trying to recompile with 
CONFIG_NETFILTER_XT_MATCH_PHYSDEV=m
Results will follow!

You need to enable CONFIG_BRIDGE_NETFILTER. This will be fixed in the next
release.

Fixed in gentoo-sources-2.6.18-r3 (genpatches-2.6.18-4)