On Sun, Jul 23, 2017 at 08:18:26AM -0400, Tejun Heo wrote: > cgroup_enable_threaded() checks that the cgroup doesn't have any tasks > or children and fails the operation if so. This test is unnecessary > because the first part is already checked by > cgroup_can_be_thread_root() and the latter is unnecessary. The latter > actually cause a behavioral oddity. Please consider the following > hierarchy. All cgroups are domains. > > A > / \ > B C > \ > D > > If B is made threaded, C and D becomes invalid domains. Due to the no > children restriction, threaded mode can't be enabled on C. For C and > D, the only thing the user can do is removal. > > There is no reason for this restriction. Remove it. > > Signed-off-by: Tejun Heo <[email protected]> > Cc: Waiman Long <[email protected]>
Applied to cgroup/for-4.14 with Waiman's ack. Thanks. -- tejun
