tree 326dbfa685987b930fa1bcf0ac0e01f2e1e4b92f
parent 42a11bf5c5436e91b040aeb04063be1710bb9f9c
author Waiman Long <longman@redhat.com> 1681220159 -0400
committer Tejun Heo <tj@kernel.org> 1681323838 -1000

cgroup/cpuset: Add cpuset_can_fork() and cpuset_cancel_fork() methods

In the case of CLONE_INTO_CGROUP, not all cpusets are ready to accept
new tasks. It is too late to check that in cpuset_fork(). So we need
to add the cpuset_can_fork() and cpuset_cancel_fork() methods to
pre-check it before we can allow attachment to a different cpuset.

We also need to set the attach_in_progress flag to alert other code
that a new task is going to be added to the cpuset.

Fixes: ef2c41cf38a7 ("clone3: allow spawning processes into cgroups")
Suggested-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Waiman Long <longman@redhat.com>
Cc: stable@vger.kernel.org # v5.7+
Signed-off-by: Tejun Heo <tj@kernel.org>