On Thu, Oct 24, 2019 at 12:03:51PM -0700, Tejun Heo wrote: > cgroup_enable_task_cg_lists() is used to lazyily initialize task > cgroup associations on the first use to reduce fork / exit overheads > on systems which don't use cgroup. Unfortunately, locking around it > has never been actually correct and its value is dubious given how the > vast majority of systems use cgroup right away from boot. > > This patch removes the optimization. For now, replace the cg_list > based branches with WARN_ON_ONCE()'s to be on the safe side. We can > simplify the logic further in the future. > > Signed-off-by: Tejun Heo <tj@xxxxxxxxxx> > Reported-by: Oleg Nesterov <oleg@xxxxxxxxxx> Applying to cgroup/for-5.5. Thanks. -- tejun
