2.5.56: Two global symbols "io"

[Adrian Bunk]

I got the following compile error in 2.5.56:

<--  snip  -->

...
        ld -m elf_i386 -e stext -T arch/i386/vmlinux.lds.s 
arch/i386/kernel/head.o arch/i386/kernel/init_task.o  init/built-in.o 
--start-group  usr/built-in.o  arch/i386/kernel/built-in.o  
arch/i386/mm/built-in.o  arch/i386/mach-default/built-in.o  
kernel/built-in.o  mm/built-in.o  fs/built-in.o  ipc/built-in.o  
security/built-in.o  crypto/built-in.o  lib/lib.a  arch/i386/lib/lib.a  
drivers/built-in.o  sound/built-in.o  arch/i386/math-emu/built-in.o  
arch/i386/pci/built-in.o  arch/i386/oprofile/built-in.o  net/built-in.o 
--end-group  -o .tmp_vmlinux1
sound/built-in.o(.data+0x7b30): multiple definition of `io'
drivers/built-in.o(.data+0x738a0):
...
ld: Warning: size of symbol `io' changed from 68 to 4 in sound/built-in.o
...
make: *** [.tmp_vmlinux1] Error 1

<--  snip  -->

The offending files are:
  sound/oss/awe_wave.c
  drivers/net/wan/cosa.c

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