[PATCH] drm/i915: Allow shrinking of userptr objects once again

[Tvrtko Ursulin <tursulin@ursulin.net>]

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Commit 1bec9b0bda3d ("drm/i915/shrinker: Only shmemfs objects
are backed by swap") stopped considering the userptr objects
in shrinker callbacks.

Restore that so idle userptr objects can be discarded in order
to free up memory.

One change further to what was introduced in 1bec9b0bda3d is
to start considering userptr objects in oom but that should
also be a correct thing to do.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Fixes: 1bec9b0bda3d ("drm/i915/shrinker: Only shmemfs objects are backed by swap")
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: <stable@vger.kernel.org>
---
 drivers/gpu/drm/i915/i915_gem_shrinker.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c b/drivers/gpu/drm/i915/i915_gem_shrinker.c
index 0993afc0e725..dfca1f6b3630 100644
--- a/drivers/gpu/drm/i915/i915_gem_shrinker.c
+++ b/drivers/gpu/drm/i915/i915_gem_shrinker.c
@@ -83,8 +83,8 @@ static bool can_release_pages(struct drm_i915_gem_object *obj)
 	if (!obj->mm.pages)
 		return false;
 
-	/* Only shmemfs objects are backed by swap */
-	if (!obj->base.filp)
+	/* shmemfs and userptr objects are backed by swap */
+	if (!obj->base.filp && !obj->userptr.mm)
 		return false;
 
 	/* Only report true if by unbinding the object and putting its pages
-- 
2.7.4