staging: ion: debugfs invalid gfp mask

The current code attempts assignment of -1 to an unsigned type. Note that
in a downstream function ion_page_pool_shrink this mask is only ever
evaluated against __GFP_HIGHMEM
(drivers/staging/android/ion/ion_page_pool.c, line 125).

Signed-off-by: Derek Yerger <[email protected]>
Reviewed-by: Laura Abbott <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Derek Yerger

drivers/staging/android/ion/ion.c

@@ -1555,7 +1555,7 @@ static int debug_shrink_set(void *data, u64 val)
 	struct shrink_control sc;
 	int objs;
 
-	sc.gfp_mask = -1;
+	sc.gfp_mask = GFP_HIGHUSER;
 	sc.nr_to_scan = val;
 
 	if (!val) {
@@ -1573,7 +1573,7 @@ static int debug_shrink_get(void *data, u64 *val)
 	struct shrink_control sc;
 	int objs;
 
-	sc.gfp_mask = -1;
+	sc.gfp_mask = GFP_HIGHUSER;
 	sc.nr_to_scan = 0;
 
 	objs = heap->shrinker.count_objects(&heap->shrinker, &sc);