commit 1c3c1dc66a9664a9b7048c3869fa7863be9123a0
author Mika Kuoppala <mika.kuoppala@linux.intel.com> Mon Apr 23 14:37:54 2018 +0300
committer Mika Kuoppala <mika.kuoppala@linux.intel.com> Tue Apr 24 15:46:27 2018 +0300
tree 04ade564e51b91927a4d9eb42d52d7cdf03ed7b9
parent 3085982c6b45d7d22f76e3aa018affbc143a7370

drm/i915: Add compiler barrier to wait_for

We need to be careful to not let compiler evaluate
the expiration and the operation on it's terms.

Document and enforce that COND will be evaluated
before checking timeout expiration.

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180423113754.28424-2-mika.kuoppala@linux.intel.com