drm/i915: undefined symbol I915_SW_FENCE_CHECK_DAG

[Valentin Rothberg]

Hi Chris,

your commit e68a139f6bf3 ("drm/i915: Add a sw fence for collecting up
dma fences") has shown up in today's linux-next (i.e., 20160912)
adding the following the lines (184++):

+       if (!IS_ENABLED(CONFIG_I915_SW_FENCE_CHECK_DAG))
+               return false;

The Kconfig symbol isn't defined anywhere, so the function will always
return false.  I could not find a patch on LKML adding the symbol.  Is
there a patch queued somewhere or is the yet unconditional return
intentional?

I found the issue by diffing the last and today's linux-next using
scripts/checkkconfigsymbols.py.

Kind regards,
 Valentin