On 20.01.2021 12:56, Valeriy Vdovin wrote:
> The flag will be used in subsequent patches
> Signed-off-by: Valeriy Vdovin <valeriy.vdo...@virtuozzo.com>
Reviewed-by: Kirill Tkhai <ktk...@virtuozzo.com>
> ---
> include/linux/cgroup-defs.h | 2 ++
> include/linux/cgroup.h | 5 +++++
> kernel/cgroup/cgroup.c | 1 +
> 3 files changed, 8 insertions(+)
>
> diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h
> index a3b309ab1a90..5ee5f10e3de7 100644
> --- a/include/linux/cgroup-defs.h
> +++ b/include/linux/cgroup-defs.h
> @@ -57,6 +57,8 @@ enum {
>
> /* bits in struct cgroup flags field */
> enum {
> + /* Control Cgroup is dead */
> + CGRP_REMOVED,
> /* Control Group requires release notifications to userspace */
> CGRP_NOTIFY_ON_RELEASE,
> /*
> diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
> index c0a42c3d43fa..dfd9460986ee 100644
> --- a/include/linux/cgroup.h
> +++ b/include/linux/cgroup.h
> @@ -922,6 +922,11 @@ static inline bool cgroup_task_frozen(struct task_struct
> *task)
> return task->frozen;
> }
>
> +static inline int cgroup_is_removed(const struct cgroup *cgrp)
> +{
> + return test_bit(CGRP_REMOVED, &cgrp->flags);
> +}
> +
> #else /* !CONFIG_CGROUPS */
>
> static inline void cgroup_enter_frozen(void) { }
> diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
> index 797a3971ab46..447c8f003496 100644
> --- a/kernel/cgroup/cgroup.c
> +++ b/kernel/cgroup/cgroup.c
> @@ -5562,6 +5562,7 @@ static int cgroup_destroy_locked(struct cgroup *cgrp)
> tcgrp->freezer.nr_frozen_descendants--;
> }
> spin_unlock_irq(&css_set_lock);
> + set_bit(CGRP_REMOVED, &cgrp->flags);
>
> cgroup1_check_for_release(parent);
>
>
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