2.6: rxrpc compile errors with SYSCTL=n

I'm getting tons of the following compile errors in 2.6.8-rc4-mm1 (but 
it doesn't seem to be specific to -mm) with CONFIG_SYSCTL=n:

<--  snip  -->

...
  LD      .tmp_vmlinux1
net/built-in.o(.text+0x154127): In function `__rxrpc_call_acks_timeout':
: undefined reference to `rxrpc_kdebug'
net/built-in.o(.text+0x154167): In function `__rxrpc_call_rcv_timeout':
: undefined reference to `rxrpc_kdebug'
net/built-in.o(.text+0x1541a7): In function `__rxrpc_call_ackr_timeout':
: undefined reference to `rxrpc_kdebug'
net/built-in.o(.text+0x15421e): In function `rxrpc_create_call':
: undefined reference to `rxrpc_ktrace'
net/built-in.o(.text+0x154242): In function `rxrpc_create_call':
: undefined reference to `rxrpc_ktrace'
net/built-in.o(.text+0x154272): In function `rxrpc_create_call':
: undefined reference to `rxrpc_ktrace'
...
make: *** [.tmp_vmlinux1] Error 1

<--  snip  -->

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed