warning: conflicting types for built-in function `vsprintf'

[Timur Tabi <timur.tabi@xxxxxxxxxxx>]

I'm porting my driver to 2.6, and with the Suse 9.1 Pro kernel 
(2.6.4-52), I'm getting this error if I include kernel.h:

  CC [M]  /mnt/ttabi/sb/starcore/software/adapter/util/diag/driver/diag.o
In file included from 
/mnt/ttabi/sb/starcore/software/adapter/util/diag/driver/diag.c:16:
include/linux/kernel.h:71: warning: conflicting types for built-in 
function `vsprintf'
include/linux/kernel.h:74: warning: conflicting types for built-in 
function `vsnprintf'
include/linux/kernel.h:81: warning: conflicting types for built-in 
function `vsscanf'

Three questions:

1) Since when is vsprintf() a built-in?
2) If it is a built-in, why does kernel.h include a prototype for it?
3) How can I fix this?

--
Timur Tabi
Staff Software Engineer
timur.tabi@xxxxxxxxxxx

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