Surprisingly kbuild can't cope with tristates in the
<module>-$(CONFIG_FOO) pattern. This patch hacks up a solution.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Michal Marek <mmarek@suse.com> Cc: linux-kbuild@vger.kernel.org Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>