The CONFIG_COMPAT_KFIFO config option must be defined
to CONFIG_COMPAT_KFIFO=y instead of CONFIG_COMPAT_KFIFO=m
as the kfifo object is not a module, its simply part of
the compat module. This should fix users of the kfifo
backport on kernels older than 2.6.36.
Signed-off-by: Luis R. Rodriguez <mcgrof@frijolero.org>