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SubjectRe: [PATCH 07/23] cgroup: Use generic ns_common::count
On Thu, Jul 30, 2020 at 02:59:57PM +0300, Kirill Tkhai wrote:
> Convert cgroup namespace to use generic counter.
>
> Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
> ---

Looks good!
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>

> include/linux/cgroup.h | 5 ++---
> kernel/cgroup/cgroup.c | 2 +-
> kernel/cgroup/namespace.c | 2 +-
> 3 files changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
> index 618838c48313..451c2d26a5db 100644
> --- a/include/linux/cgroup.h
> +++ b/include/linux/cgroup.h
> @@ -854,7 +854,6 @@ static inline void cgroup_sk_free(struct sock_cgroup_data *skcd) {}
> #endif /* CONFIG_CGROUP_DATA */
>
> struct cgroup_namespace {
> - refcount_t count;
> struct ns_common ns;
> struct user_namespace *user_ns;
> struct ucounts *ucounts;
> @@ -889,12 +888,12 @@ copy_cgroup_ns(unsigned long flags, struct user_namespace *user_ns,
> static inline void get_cgroup_ns(struct cgroup_namespace *ns)
> {
> if (ns)
> - refcount_inc(&ns->count);
> + refcount_inc(&ns->ns.count);
> }
>
> static inline void put_cgroup_ns(struct cgroup_namespace *ns)
> {
> - if (ns && refcount_dec_and_test(&ns->count))
> + if (ns && refcount_dec_and_test(&ns->ns.count))
> free_cgroup_ns(ns);
> }
>
> diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
> index dd247747ec14..22e466926853 100644
> --- a/kernel/cgroup/cgroup.c
> +++ b/kernel/cgroup/cgroup.c
> @@ -199,7 +199,7 @@ static u16 have_canfork_callback __read_mostly;
>
> /* cgroup namespace for init task */
> struct cgroup_namespace init_cgroup_ns = {
> - .count = REFCOUNT_INIT(2),
> + .ns.count = REFCOUNT_INIT(2),
> .user_ns = &init_user_ns,
> .ns.ops = &cgroupns_operations,
> .ns.inum = PROC_CGROUP_INIT_INO,
> diff --git a/kernel/cgroup/namespace.c b/kernel/cgroup/namespace.c
> index 812a61afd538..f5e8828c109c 100644
> --- a/kernel/cgroup/namespace.c
> +++ b/kernel/cgroup/namespace.c
> @@ -32,7 +32,7 @@ static struct cgroup_namespace *alloc_cgroup_ns(void)
> kfree(new_ns);
> return ERR_PTR(ret);
> }
> - refcount_set(&new_ns->count, 1);
> + refcount_set(&new_ns->ns.count, 1);
> new_ns->ns.ops = &cgroupns_operations;
> return new_ns;
> }
>
>

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