refactor node markers, remove need to be aware of nodes

_pytest/mark/structures.py

@@ -369,13 +369,8 @@ class NodeKeywords(MappingMixin):
 
 @attr.s(cmp=False, hash=False)
 class NodeMarkers(object):
-    node = attr.ib(repr=False)
     own_markers = attr.ib(default=attr.Factory(list))
 
-    @classmethod
-    def from_node(cls, node):
-        return cls(node=node)
-
     def update(self, add_markers):
         """update the own markers
         """
@@ -386,7 +381,6 @@ class NodeMarkers(object):
         find markers in own nodes or parent nodes
         needs a better place
         """
-        for node in reversed(self.node.listchain()):
-            for mark in node._markers.own_markers:
-                if mark.name == name:
-                    yield mark
+        for mark in self.own_markers:
+            if mark.name == name:
+                yield mark

_pytest/nodes.py

@@ -90,7 +90,7 @@ class Node(object):
 
         #: keywords/markers collected from all scopes
         self.keywords = NodeKeywords(self)
-        self._markers = NodeMarkers.from_node(self)
+        self._markers = NodeMarkers()
 
         #: allow adding of extra keywords to use for matching
         self.extra_keyword_matches = set()
@@ -184,7 +184,9 @@ class Node(object):
 
     def find_markers(self, name):
         """find all marks with the given name on the node and its parents"""
-        return self._markers.find(name)
+        for node in reversed(self.listchain()):
+            for mark in node._markers.find(name):
+                yield mark
 
     def get_marker(self, name):
         """ get a marker object from this node or None if