Re: [PATCH RFC v2 3/7] cgroup: Add interface to allow drivers to lookup process cgroup membership

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Hello,

On Thu, Feb 01, 2018 at 11:53:11AM -0800, Matt Roper wrote:
> +/**
> + * cgroup_for_driver_process - return the cgroup for a process
> + * @pid: process to lookup cgroup for
> + *
> + * Returns the cgroup from the v2 hierarchy that a process belongs to.
> + * This function is intended to be called from drivers and will obtain
> + * the necessary cgroup locks.
> + *
> + * RETURNS:
> + * Process' cgroup in the default (v2) hierarchy
> + */
> +struct cgroup *
> +cgroup_for_driver_process(struct pid *pid)

I think you probably want to use task_dfl_cgroup().  We can add
task_get_dfl_cgroup() in a similar fashion to task_get_css() if
necessary.

Thanks.

-- 
tejun
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