Re: [PATCH v2 cgroup/for-7.1-fixes sched_ext/for-7.1-fixes] cgroup: Defer css percpu_ref kill on rmdir until cgroup is depopulated

[Sebastian Andrzej Siewior]

On 2026-05-01 08:31:22 [-1000], Tejun Heo wrote:
> A chain of commits going back to v7.0 reworked rmdir to satisfy the
> controller invariant that a subsystem's ->css_offline() must not run while
> tasks are still doing kernel-side work in the cgroup.
…
> 
> Fixes: 1b164b876c36 ("cgroup: Wait for dying tasks to leave on rmdir")
> Cc: stable@xxxxxxxxxxxxxxx # v7.0+
> Reported-by: Martin Pitt <martin@xxxxxxxxx>
> Link: https://lore.kernel.org/all/afHNg2VX2jy9bW7y@xxxxxxxxx/
> Link: https://lore.kernel.org/all/35e0670adb4abeab13da2c321582af9f@xxxxxxxxxx/
> Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
> Cc: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>

I gave it a quick spin, everything looks fine.

Acked-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>

Sebastian