diff --git a/poky/bitbake/lib/bb/runqueue.py b/poky/bitbake/lib/bb/runqueue.py
index 10511a0..8ae3fe8 100644
--- a/poky/bitbake/lib/bb/runqueue.py
+++ b/poky/bitbake/lib/bb/runqueue.py
@@ -385,7 +385,6 @@
         self.rq = rq
         self.warn_multi_bb = False
 
-        self.stampwhitelist = cfgData.getVar("BB_STAMP_WHITELIST") or ""
         self.multi_provider_whitelist = (cfgData.getVar("MULTI_PROVIDER_WHITELIST") or "").split()
         self.setscenewhitelist = get_setscene_enforce_whitelist(cfgData, targets)
         self.setscenewhitelist_checked = False
@@ -547,7 +546,7 @@
                         next_points.append(revdep)
                         task_done[revdep] = True
             endpoints = next_points
-            if len(next_points) == 0:
+            if not next_points:
                 break
 
         # Circular dependency sanity check
@@ -589,7 +588,7 @@
 
         found = False
         for mc in self.taskData:
-            if len(taskData[mc].taskentries) > 0:
+            if taskData[mc].taskentries:
                 found = True
                 break
         if not found:
@@ -773,7 +772,7 @@
         # Find the dependency chain endpoints
         endpoints = set()
         for tid in self.runtaskentries:
-            if len(deps[tid]) == 0:
+            if not deps[tid]:
                 endpoints.add(tid)
         # Iterate the chains collating dependencies
         while endpoints:
@@ -784,11 +783,11 @@
                     cumulativedeps[dep].update(cumulativedeps[tid])
                     if tid in deps[dep]:
                         deps[dep].remove(tid)
-                    if len(deps[dep]) == 0:
+                    if not deps[dep]:
                         next.add(dep)
             endpoints = next
         #for tid in deps:
-        #    if len(deps[tid]) != 0:
+        #    if deps[tid]:
         #        bb.warn("Sanity test failure, dependencies left for %s (%s)" % (tid, deps[tid]))
 
         # Loop here since recrdeptasks can depend upon other recrdeptasks and we have to
@@ -926,39 +925,37 @@
         #
         # Once all active tasks are marked, prune the ones we don't need.
 
-        delcount = {}
-        for tid in list(self.runtaskentries.keys()):
-            if tid not in runq_build:
-                delcount[tid] = self.runtaskentries[tid]
-                del self.runtaskentries[tid]
-
         # Handle --runall
         if self.cooker.configuration.runall:
             # re-run the mark_active and then drop unused tasks from new list
+            reduced_tasklist = set(self.runtaskentries.keys())
+            for tid in list(self.runtaskentries.keys()):
+                if tid not in runq_build:
+                   reduced_tasklist.remove(tid)
             runq_build = {}
 
             for task in self.cooker.configuration.runall:
                 if not task.startswith("do_"):
                     task = "do_{0}".format(task)
                 runall_tids = set()
-                for tid in list(self.runtaskentries):
+                for tid in reduced_tasklist:
                     wanttid = "{0}:{1}".format(fn_from_tid(tid), task)
-                    if wanttid in delcount:
-                        self.runtaskentries[wanttid] = delcount[wanttid]
                     if wanttid in self.runtaskentries:
                         runall_tids.add(wanttid)
 
                 for tid in list(runall_tids):
-                    mark_active(tid,1)
+                    mark_active(tid, 1)
                     if self.cooker.configuration.force:
                         invalidate_task(tid, False)
 
-            for tid in list(self.runtaskentries.keys()):
-                if tid not in runq_build:
-                    delcount[tid] = self.runtaskentries[tid]
-                    del self.runtaskentries[tid]
+        delcount = set()
+        for tid in list(self.runtaskentries.keys()):
+            if tid not in runq_build:
+                delcount.add(tid)
+                del self.runtaskentries[tid]
 
-            if len(self.runtaskentries) == 0:
+        if self.cooker.configuration.runall:
+            if not self.runtaskentries:
                 bb.msg.fatal("RunQueue", "Could not find any tasks with the tasknames %s to run within the recipes of the taskgraphs of the targets %s" % (str(self.cooker.configuration.runall), str(self.targets)))
 
         self.init_progress_reporter.next_stage()
@@ -971,19 +968,19 @@
             for task in self.cooker.configuration.runonly:
                 if not task.startswith("do_"):
                     task = "do_{0}".format(task)
-                runonly_tids = { k: v for k, v in self.runtaskentries.items() if taskname_from_tid(k) == task }
+                runonly_tids = [k for k in self.runtaskentries.keys() if taskname_from_tid(k) == task]
 
-                for tid in list(runonly_tids):
-                    mark_active(tid,1)
+                for tid in runonly_tids:
+                    mark_active(tid, 1)
                     if self.cooker.configuration.force:
                         invalidate_task(tid, False)
 
             for tid in list(self.runtaskentries.keys()):
                 if tid not in runq_build:
-                    delcount[tid] = self.runtaskentries[tid]
+                    delcount.add(tid)
                     del self.runtaskentries[tid]
 
-            if len(self.runtaskentries) == 0:
+            if not self.runtaskentries:
                 bb.msg.fatal("RunQueue", "Could not find any tasks with the tasknames %s to run within the taskgraphs of the targets %s" % (str(self.cooker.configuration.runonly), str(self.targets)))
 
         #
@@ -991,7 +988,7 @@
         #
 
         # Check to make sure we still have tasks to run
-        if len(self.runtaskentries) == 0:
+        if not self.runtaskentries:
             if not taskData[''].abort:
                 bb.msg.fatal("RunQueue", "All buildable tasks have been run but the build is incomplete (--continue mode). Errors for the tasks that failed will have been printed above.")
             else:
@@ -1015,7 +1012,7 @@
         endpoints = []
         for tid in self.runtaskentries:
             revdeps = self.runtaskentries[tid].revdeps
-            if len(revdeps) == 0:
+            if not revdeps:
                 endpoints.append(tid)
             for dep in revdeps:
                 if dep in self.runtaskentries[tid].depends:
@@ -1061,12 +1058,12 @@
                         seen_pn.append(pn)
                     else:
                         bb.fatal("Multiple versions of %s are due to be built (%s). Only one version of a given PN should be built in any given build. You likely need to set PREFERRED_VERSION_%s to select the correct version or don't depend on multiple versions." % (pn, " ".join(prov_list[prov]), pn))
-                msg = "Multiple .bb files are due to be built which each provide %s:\n  %s" % (prov, "\n  ".join(prov_list[prov]))
+                msgs = ["Multiple .bb files are due to be built which each provide %s:\n  %s" % (prov, "\n  ".join(prov_list[prov]))]
                 #
                 # Construct a list of things which uniquely depend on each provider
                 # since this may help the user figure out which dependency is triggering this warning
                 #
-                msg += "\nA list of tasks depending on these providers is shown and may help explain where the dependency comes from."
+                msgs.append("\nA list of tasks depending on these providers is shown and may help explain where the dependency comes from.")
                 deplist = {}
                 commondeps = None
                 for provfn in prov_list[prov]:
@@ -1086,12 +1083,12 @@
                         commondeps &= deps
                     deplist[provfn] = deps
                 for provfn in deplist:
-                    msg += "\n%s has unique dependees:\n  %s" % (provfn, "\n  ".join(deplist[provfn] - commondeps))
+                    msgs.append("\n%s has unique dependees:\n  %s" % (provfn, "\n  ".join(deplist[provfn] - commondeps)))
                 #
                 # Construct a list of provides and runtime providers for each recipe
                 # (rprovides has to cover RPROVIDES, PACKAGES, PACKAGES_DYNAMIC)
                 #
-                msg += "\nIt could be that one recipe provides something the other doesn't and should. The following provider and runtime provider differences may be helpful."
+                msgs.append("\nIt could be that one recipe provides something the other doesn't and should. The following provider and runtime provider differences may be helpful.")
                 provide_results = {}
                 rprovide_results = {}
                 commonprovs = None
@@ -1118,29 +1115,18 @@
                     else:
                         commonrprovs &= rprovides
                     rprovide_results[provfn] = rprovides
-                #msg += "\nCommon provides:\n  %s" % ("\n  ".join(commonprovs))
-                #msg += "\nCommon rprovides:\n  %s" % ("\n  ".join(commonrprovs))
+                #msgs.append("\nCommon provides:\n  %s" % ("\n  ".join(commonprovs)))
+                #msgs.append("\nCommon rprovides:\n  %s" % ("\n  ".join(commonrprovs)))
                 for provfn in prov_list[prov]:
-                    msg += "\n%s has unique provides:\n  %s" % (provfn, "\n  ".join(provide_results[provfn] - commonprovs))
-                    msg += "\n%s has unique rprovides:\n  %s" % (provfn, "\n  ".join(rprovide_results[provfn] - commonrprovs))
+                    msgs.append("\n%s has unique provides:\n  %s" % (provfn, "\n  ".join(provide_results[provfn] - commonprovs)))
+                    msgs.append("\n%s has unique rprovides:\n  %s" % (provfn, "\n  ".join(rprovide_results[provfn] - commonrprovs)))
 
                 if self.warn_multi_bb:
-                    logger.verbnote(msg)
+                    logger.verbnote("".join(msgs))
                 else:
-                    logger.error(msg)
+                    logger.error("".join(msgs))
 
         self.init_progress_reporter.next_stage()
-
-        # Create a whitelist usable by the stamp checks
-        self.stampfnwhitelist = {}
-        for mc in self.taskData:
-            self.stampfnwhitelist[mc] = []
-            for entry in self.stampwhitelist.split():
-                if entry not in self.taskData[mc].build_targets:
-                    continue
-                fn = self.taskData.build_targets[entry][0]
-                self.stampfnwhitelist[mc].append(fn)
-
         self.init_progress_reporter.next_stage()
 
         # Iterate over the task list looking for tasks with a 'setscene' function
@@ -1188,9 +1174,9 @@
         # Iterate over the task list and call into the siggen code
         dealtwith = set()
         todeal = set(self.runtaskentries)
-        while len(todeal) > 0:
+        while todeal:
             for tid in todeal.copy():
-                if len(self.runtaskentries[tid].depends - dealtwith) == 0:
+                if not (self.runtaskentries[tid].depends - dealtwith):
                     dealtwith.add(tid)
                     todeal.remove(tid)
                     self.prepare_task_hash(tid)
@@ -1229,7 +1215,6 @@
         self.cfgData = cfgData
         self.rqdata = RunQueueData(self, cooker, cfgData, dataCaches, taskData, targets)
 
-        self.stamppolicy = cfgData.getVar("BB_STAMP_POLICY") or "perfile"
         self.hashvalidate = cfgData.getVar("BB_HASHCHECK_FUNCTION") or None
         self.depvalidate = cfgData.getVar("BB_SETSCENE_DEPVALID") or None
 
@@ -1358,14 +1343,6 @@
         if taskname is None:
             taskname = tn
 
-        if self.stamppolicy == "perfile":
-            fulldeptree = False
-        else:
-            fulldeptree = True
-            stampwhitelist = []
-            if self.stamppolicy == "whitelist":
-                stampwhitelist = self.rqdata.stampfnwhitelist[mc]
-
         stampfile = bb.build.stampfile(taskname, self.rqdata.dataCaches[mc], taskfn)
 
         # If the stamp is missing, it's not current
@@ -1397,7 +1374,7 @@
                     continue
                 if t3 and t3 > t2:
                     continue
-                if fn == fn2 or (fulldeptree and fn2 not in stampwhitelist):
+                if fn == fn2:
                     if not t2:
                         logger.debug2('Stampfile %s does not exist', stampfile2)
                         iscurrent = False
@@ -1500,10 +1477,10 @@
             self.rqexe = RunQueueExecute(self)
 
             # If we don't have any setscene functions, skip execution
-            if len(self.rqdata.runq_setscene_tids) == 0:
+            if not self.rqdata.runq_setscene_tids:
                 logger.info('No setscene tasks')
                 for tid in self.rqdata.runtaskentries:
-                    if len(self.rqdata.runtaskentries[tid].depends) == 0:
+                    if not self.rqdata.runtaskentries[tid].depends:
                         self.rqexe.setbuildable(tid)
                     self.rqexe.tasks_notcovered.add(tid)
                 self.rqexe.sqdone = True
@@ -1780,7 +1757,7 @@
             bb.fatal("Invalid scheduler '%s'.  Available schedulers: %s" %
                      (self.scheduler, ", ".join(obj.name for obj in schedulers)))
 
-        #if len(self.rqdata.runq_setscene_tids) > 0:
+        #if self.rqdata.runq_setscene_tids:
         self.sqdata = SQData()
         build_scenequeue_data(self.sqdata, self.rqdata, self.rq, self.cooker, self.stampcache, self)
 
@@ -1821,7 +1798,7 @@
                 # worker must have died?
                 pass
 
-        if len(self.failed_tids) != 0:
+        if self.failed_tids:
             self.rq.state = runQueueFailed
             return
 
@@ -1837,7 +1814,7 @@
             self.rq.read_workers()
             return self.rq.active_fds()
 
-        if len(self.failed_tids) != 0:
+        if self.failed_tids:
             self.rq.state = runQueueFailed
             return True
 
@@ -1935,7 +1912,7 @@
         self.stats.taskFailed()
         self.failed_tids.append(task)
 
-        fakeroot_log = ""
+        fakeroot_log = []
         if fakerootlog and os.path.exists(fakerootlog):
             with open(fakerootlog) as fakeroot_log_file:
                 fakeroot_failed = False
@@ -1945,12 +1922,12 @@
                             fakeroot_failed = True
                     if 'doing new pid setup and server start' in line:
                         break
-                    fakeroot_log = line + fakeroot_log
+                    fakeroot_log.append(line)
 
             if not fakeroot_failed:
-                fakeroot_log = None
+                fakeroot_log = []
 
-        bb.event.fire(runQueueTaskFailed(task, self.stats, exitcode, self.rq, fakeroot_log=fakeroot_log), self.cfgData)
+        bb.event.fire(runQueueTaskFailed(task, self.stats, exitcode, self.rq, fakeroot_log=("".join(fakeroot_log) or None)), self.cfgData)
 
         if self.rqdata.taskData[''].abort:
             self.rq.state = runQueueCleanUp
@@ -2001,7 +1978,7 @@
             if x not in self.tasks_scenequeue_done:
                 logger.error("Task %s was never processed by the setscene code" % x)
                 err = True
-            if len(self.rqdata.runtaskentries[x].depends) == 0 and x not in self.runq_buildable:
+            if not self.rqdata.runtaskentries[x].depends and x not in self.runq_buildable:
                 logger.error("Task %s was never marked as buildable by the setscene code" % x)
                 err = True
         return err
@@ -2025,7 +2002,7 @@
             # Find the next setscene to run
             for nexttask in self.sorted_setscene_tids:
                 if nexttask in self.sq_buildable and nexttask not in self.sq_running and self.sqdata.stamps[nexttask] not in self.build_stamps.values():
-                    if nexttask not in self.sqdata.unskippable and len(self.sqdata.sq_revdeps[nexttask]) > 0 and self.sqdata.sq_revdeps[nexttask].issubset(self.scenequeue_covered) and self.check_dependencies(nexttask, self.sqdata.sq_revdeps[nexttask]):
+                    if nexttask not in self.sqdata.unskippable and self.sqdata.sq_revdeps[nexttask] and self.sqdata.sq_revdeps[nexttask].issubset(self.scenequeue_covered) and self.check_dependencies(nexttask, self.sqdata.sq_revdeps[nexttask]):
                         if nexttask not in self.rqdata.target_tids:
                             logger.debug2("Skipping setscene for task %s" % nexttask)
                             self.sq_task_skip(nexttask)
@@ -2189,7 +2166,7 @@
             if self.can_start_task():
                 return True
 
-        if self.stats.active > 0 or len(self.sq_live) > 0:
+        if self.stats.active > 0 or self.sq_live:
             self.rq.read_workers()
             return self.rq.active_fds()
 
@@ -2201,7 +2178,7 @@
                 self.sq_task_failoutright(tid)
             return True
 
-        if len(self.failed_tids) != 0:
+        if self.failed_tids:
             self.rq.state = runQueueFailed
             return True
 
@@ -2280,7 +2257,7 @@
         covered.intersection_update(self.tasks_scenequeue_done)
 
         for tid in notcovered | covered:
-            if len(self.rqdata.runtaskentries[tid].depends) == 0:
+            if not self.rqdata.runtaskentries[tid].depends:
                 self.setbuildable(tid)
             elif self.rqdata.runtaskentries[tid].depends.issubset(self.runq_complete):
                  self.setbuildable(tid)
@@ -2339,7 +2316,7 @@
         # Now iterate those tasks in dependency order to regenerate their taskhash/unihash
         next = set()
         for p in total:
-            if len(self.rqdata.runtaskentries[p].depends) == 0:
+            if not self.rqdata.runtaskentries[p].depends:
                 next.add(p)
             elif self.rqdata.runtaskentries[p].depends.isdisjoint(total):
                 next.add(p)
@@ -2349,7 +2326,7 @@
             current = next.copy()
             next = set()
             for tid in current:
-                if len(self.rqdata.runtaskentries[p].depends) and not self.rqdata.runtaskentries[tid].depends.isdisjoint(total):
+                if self.rqdata.runtaskentries[p].depends and not self.rqdata.runtaskentries[tid].depends.isdisjoint(total):
                     continue
                 orighash = self.rqdata.runtaskentries[tid].hash
                 dc = bb.parse.siggen.get_data_caches(self.rqdata.dataCaches, mc_from_tid(tid))
@@ -2436,7 +2413,7 @@
             if not harddepfail and self.sqdata.sq_revdeps[tid].issubset(self.scenequeue_covered | self.scenequeue_notcovered):
                 if tid not in self.sq_buildable:
                     self.sq_buildable.add(tid)
-            if len(self.sqdata.sq_revdeps[tid]) == 0:
+            if not self.sqdata.sq_revdeps[tid]:
                 self.sq_buildable.add(tid)
 
             if tid in self.sqdata.outrightfail:
@@ -2608,12 +2585,13 @@
         pn = self.rqdata.dataCaches[mc].pkg_fn[taskfn]
         if not check_setscene_enforce_whitelist(pn, taskname, self.rqdata.setscenewhitelist):
             if tid in self.rqdata.runq_setscene_tids:
-                msg = 'Task %s.%s attempted to execute unexpectedly and should have been setscened' % (pn, taskname)
+                msg = ['Task %s.%s attempted to execute unexpectedly and should have been setscened' % (pn, taskname)]
             else:
-                msg = 'Task %s.%s attempted to execute unexpectedly' % (pn, taskname)
+                msg = ['Task %s.%s attempted to execute unexpectedly' % (pn, taskname)]
             for t in self.scenequeue_notcovered:
-                msg = msg + "\nTask %s, unihash %s, taskhash %s" % (t, self.rqdata.runtaskentries[t].unihash, self.rqdata.runtaskentries[t].hash)
-            logger.error(msg + '\nThis is usually due to missing setscene tasks. Those missing in this build were: %s' % pprint.pformat(self.scenequeue_notcovered))
+                msg.append("\nTask %s, unihash %s, taskhash %s" % (t, self.rqdata.runtaskentries[t].unihash, self.rqdata.runtaskentries[t].hash))
+            msg.append('\nThis is usually due to missing setscene tasks. Those missing in this build were: %s' % pprint.pformat(self.scenequeue_notcovered))
+            logger.error("".join(msg))
             return True
         return False
 
@@ -2652,7 +2630,7 @@
     for tid in rqdata.runtaskentries:
         sq_revdeps[tid] = copy.copy(rqdata.runtaskentries[tid].revdeps)
         sq_revdeps_squash[tid] = set()
-        if (len(sq_revdeps[tid]) == 0) and tid not in rqdata.runq_setscene_tids:
+        if not sq_revdeps[tid] and tid not in rqdata.runq_setscene_tids:
             #bb.warn("Added endpoint %s" % (tid))
             endpoints[tid] = set()
 
@@ -2693,9 +2671,9 @@
                     sq_revdeps[dep].remove(point)
                 if tasks:
                     sq_revdeps_squash[dep] |= tasks
-                if len(sq_revdeps[dep]) == 0 and dep not in rqdata.runq_setscene_tids:
+                if not sq_revdeps[dep] and dep not in rqdata.runq_setscene_tids:
                     newendpoints[dep] = task
-        if len(newendpoints) != 0:
+        if newendpoints:
             process_endpoints(newendpoints)
 
     process_endpoints(endpoints)
@@ -2707,7 +2685,7 @@
     # Take the build endpoints (no revdeps) and find the sstate tasks they depend upon
     new = True
     for tid in rqdata.runtaskentries:
-        if len(rqdata.runtaskentries[tid].revdeps) == 0:
+        if not rqdata.runtaskentries[tid].revdeps:
             sqdata.unskippable.add(tid)
     sqdata.unskippable |= sqrq.cantskip
     while new:
@@ -2716,7 +2694,7 @@
         for tid in sorted(orig, reverse=True):
             if tid in rqdata.runq_setscene_tids:
                 continue
-            if len(rqdata.runtaskentries[tid].depends) == 0:
+            if not rqdata.runtaskentries[tid].depends:
                 # These are tasks which have no setscene tasks in their chain, need to mark as directly buildable
                 sqrq.setbuildable(tid)
             sqdata.unskippable |= rqdata.runtaskentries[tid].depends
@@ -2731,7 +2709,7 @@
     for taskcounter, tid in enumerate(rqdata.runtaskentries):
         if tid in rqdata.runq_setscene_tids:
             pass
-        elif len(sq_revdeps_squash[tid]) != 0:
+        elif sq_revdeps_squash[tid]:
             bb.msg.fatal("RunQueue", "Something went badly wrong during scenequeue generation, aborting. Please report this problem.")
         else:
             del sq_revdeps_squash[tid]
@@ -2796,7 +2774,7 @@
     sqdata.multiconfigs = set()
     for tid in sqdata.sq_revdeps:
         sqdata.multiconfigs.add(mc_from_tid(tid))
-        if len(sqdata.sq_revdeps[tid]) == 0:
+        if not sqdata.sq_revdeps[tid]:
             sqrq.sq_buildable.add(tid)
 
     rqdata.init_progress_reporter.finish()
@@ -3050,7 +3028,7 @@
                 raise
         end = len(self.queue)
         found = True
-        while found and len(self.queue):
+        while found and self.queue:
             found = False
             index = self.queue.find(b"</event>")
             while index != -1 and self.queue.startswith(b"<event>"):
@@ -3088,7 +3066,7 @@
     def close(self):
         while self.read():
             continue
-        if len(self.queue) > 0:
+        if self.queue:
             print("Warning, worker left partial message: %s" % self.queue)
         self.input.close()