Silence a warning (with an explanation)

pyop2/codegen/rep2loopy.py

@@ -546,6 +546,14 @@ def renamer(expr):
         assumptions = assumptions & pwaffd[parameters.layer_start].le_set(pwaffd[parameters.layer_end])
     assumptions = reduce(operator.and_, assumptions.get_basic_sets())
 
+    # Even though we think we are setting loop priorities correctly here, loopy cannot
+    # use its new scheduler and raises a warning stating that there are
+    # "loop priority dependencies between sibling loop nests".
+    # See https://github.com/inducer/loopy/issues/890.
+    # Therefore until loopy fixes this we disable this warning and use the old (slower)
+    # scheduling algorithm.
+    silenced_warnings = ["v1_scheduler_fallback"]
+
     wrapper = loopy.make_kernel(domains,
                                 statements,
                                 kernel_data=parameters.kernel_data,
@@ -556,7 +564,8 @@ def renamer(expr):
                                 assumptions=assumptions,
                                 lang_version=(2018, 2),
                                 name=wrapper_name,
-                                loop_priority=loop_priorities)
+                                loop_priority=loop_priorities,
+                                silenced_warnings=silenced_warnings)
 
     # register kernel
     kernel = builder.kernel