Hey, Michal. On Wed, Oct 31, 2012 at 03:37:51PM +0100, Michal Hocko wrote: > > + for_each_subsys(cgrp->root, ss) > > + if (ss->pre_destroy) > > + WARN_ON_ONCE(ss->pre_destroy(cgrp)); > > Hmm, I am not sure I like this WARN_ON_ONCE. First it can happen for > more than one controller and second we can just clear CGRP_WAIT_ON_RMDIR > and return with EBUSY. The only possible failure at the moment is when a > new task or a child group appear. > I know it is not a big deal because it will disappear later in the > series but it would be more readable IMO.
The WARN_ON_ONCE() is just moved from the original cgroup_call_pre_destroy(). We can add an error out there but that makes future changes difficult. It's a chicken and egg problem. You gotta break the loop somewhere. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
