Re: [PATCH 03/23] ipc: Use generic ns_common::count

[Christian Brauner]

On Thu, Jul 30, 2020 at 02:59:36PM +0300, Kirill Tkhai wrote:
> Convert uts namespace to use generic counter.
> 
> Signed-off-by: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
> ---

Acked-by: Christian Brauner <christian.brauner@xxxxxxxxxx>

>  include/linux/ipc_namespace.h |    3 +--
>  ipc/msgutil.c                 |    2 +-
>  ipc/namespace.c               |    4 ++--
>  3 files changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h
> index a06a78c67f19..05e22770af51 100644
> --- a/include/linux/ipc_namespace.h
> +++ b/include/linux/ipc_namespace.h
> @@ -27,7 +27,6 @@ struct ipc_ids {
>  };
>  
>  struct ipc_namespace {
> -	refcount_t	count;
>  	struct ipc_ids	ids[3];
>  
>  	int		sem_ctls[4];
> @@ -128,7 +127,7 @@ extern struct ipc_namespace *copy_ipcs(unsigned long flags,
>  static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
>  {
>  	if (ns)
> -		refcount_inc(&ns->count);
> +		refcount_inc(&ns->ns.count);
>  	return ns;
>  }
>  
> diff --git a/ipc/msgutil.c b/ipc/msgutil.c
> index 3149b4a379de..d0a0e877cadd 100644
> --- a/ipc/msgutil.c
> +++ b/ipc/msgutil.c
> @@ -26,7 +26,7 @@ DEFINE_SPINLOCK(mq_lock);
>   * and not CONFIG_IPC_NS.
>   */
>  struct ipc_namespace init_ipc_ns = {
> -	.count		= REFCOUNT_INIT(1),
> +	.ns.count = REFCOUNT_INIT(1),
>  	.user_ns = &init_user_ns,
>  	.ns.inum = PROC_IPC_INIT_INO,
>  #ifdef CONFIG_IPC_NS
> diff --git a/ipc/namespace.c b/ipc/namespace.c
> index 24e7b45320f7..7bd0766ddc3b 100644
> --- a/ipc/namespace.c
> +++ b/ipc/namespace.c
> @@ -51,7 +51,7 @@ static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns,
>  		goto fail_free;
>  	ns->ns.ops = &ipcns_operations;
>  
> -	refcount_set(&ns->count, 1);
> +	refcount_set(&ns->ns.count, 1);
>  	ns->user_ns = get_user_ns(user_ns);
>  	ns->ucounts = ucounts;
>  
> @@ -164,7 +164,7 @@ static DECLARE_WORK(free_ipc_work, free_ipc);
>   */
>  void put_ipc_ns(struct ipc_namespace *ns)
>  {
> -	if (refcount_dec_and_lock(&ns->count, &mq_lock)) {
> +	if (refcount_dec_and_lock(&ns->ns.count, &mq_lock)) {
>  		mq_clear_sbinfo(ns);
>  		spin_unlock(&mq_lock);
>  
> 
>