linux-kernel - drm/i915: undefined symbol I915_SW_FENCE_CHECK

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Date:   Mon, 12 Sep 2016 08:46:39 +0200
From:   Valentin Rothberg <valentinrothberg@...il.com>
To:     chris@...is-wilson.co.uk
Cc:     joonas.lahtinen@...ux.intel.com,
        LKML <linux-kernel@...r.kernel.org>
Subject: drm/i915: undefined symbol I915_SW_FENCE_CHECK_DAG

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