Re: data-race in cgroup_get_tree / proc_cgroup_show

[Christian Brauner]

On Sun, Aug 28, 2022 at 08:22:02AM -1000, Tejun Heo wrote:
> On Mon, Aug 22, 2022 at 01:04:58PM -0400, Gabriel Ryan wrote:
> > Hi Christian,
> > 
> > We ran a quick test and confirm your suggestion would eliminate the
> > data race alert we observed. If the data race is benign (and it
> > appears to be), using WRITE_ONCE(cgrp_dfl_visible, true) instead of
> > cmpxchg in cgroup_get_tree() would probably also be ok.
> 
> I don't see how the data race can lead to anything but would the following
> work?

Yep. You can take my,
Reviewed-by: Christian Brauner (Microsoft) <brauner@xxxxxxxxxx>
when you turn it into a patch.