Merge drm/drm-next into drm-intel-gt-next

Backmerging to pull in the new dma_resv iterators requested by
Maarten and Matt.

Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 74296c2d1fed..b1512cefcffa 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -687,6 +687,21 @@ void unregister_shrinker(struct shrinker *shrinker)
 }
 EXPORT_SYMBOL(unregister_shrinker);
 
+/**
+ * synchronize_shrinkers - Wait for all running shrinkers to complete.
+ *
+ * This is equivalent to calling unregister_shrink() and register_shrinker(),
+ * but atomically and with less overhead. This is useful to guarantee that all
+ * shrinker invocations have seen an update, before freeing memory, similar to
+ * rcu.
+ */
+void synchronize_shrinkers(void)
+{
+	down_write(&shrinker_rwsem);
+	up_write(&shrinker_rwsem);
+}
+EXPORT_SYMBOL(synchronize_shrinkers);
+
 #define SHRINK_BATCH 128
 
 static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,