linux-kernel - Re: [PATCH] Make initializer for statically declared krefs

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Message-ID: <20071001131921.GA30599@sergelap.austin.ibm.com>
Date:	Mon, 1 Oct 2007 08:19:21 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Pavel Emelyanov <xemul@...nvz.org>
Cc:	Andrew Morton <akpm@...l.org>, Cedric Le Goater <clg@...ibm.com>,
	Serge Hallyn <serue@...ibm.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	devel@...nvz.org
Subject: Re: [PATCH] Make initializer for statically declared krefs

Quoting Pavel Emelyanov (xemul@...nvz.org):
> Since the struct kref already has the _get, _put and _init 
> routines, this seems useful to have an initializer for those
> statically declared (like for atomic_t or spinlock_t).
> 
> Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>

Sure.

Acked-by: Serge Hallyn <serue@...ibm.com>

> ---
> 
> diff --git a/include/linux/kref.h b/include/linux/kref.h
> index 6fee353..a84c582 100644
> --- a/include/linux/kref.h
> +++ b/include/linux/kref.h
> @@ -24,6 +24,8 @@ struct kref {
>  	atomic_t refcount;
>  };
> 
> +#define INIT_KREF(count)	{ .refcount = ATOMIC_INIT(count), }
> +
>  void kref_init(struct kref *kref);
>  void kref_get(struct kref *kref);
>  int kref_put(struct kref *kref, void (*release) (struct kref *kref));
> diff --git a/init/version.c b/init/version.c
> index 9d17d70..53d2ca7 100644
> --- a/init/version.c
> +++ b/init/version.c
> @@ -19,9 +19,7 @@
>  int version_string(LINUX_VERSION_CODE);
> 
>  struct uts_namespace init_uts_ns = {
> -	.kref = {
> -		.refcount	= ATOMIC_INIT(2),
> -	},
> +	.kref = INIT_KREF(2),
>  	.name = {
>  		.sysname	= UTS_SYSNAME,
>  		.nodename	= UTS_NODENAME,
> diff --git a/ipc/util.c b/ipc/util.c
> index fd29246..526aa14 100644
> --- a/ipc/util.c
> +++ b/ipc/util.c
> @@ -45,9 +45,7 @@ struct ipc_proc_iface {
>  };
> 
>  struct ipc_namespace init_ipc_ns = {
> -	.kref = {
> -		.refcount	= ATOMIC_INIT(2),
> -	},
> +	.kref = INIT_KREF(2),
>  };
> 
>  static struct ipc_namespace *clone_ipc_ns(struct ipc_namespace *old_ns)
> diff --git a/kernel/pid.c b/kernel/pid.c
> index d7388d7..e9d3ff1 100644
> --- a/kernel/pid.c
> +++ b/kernel/pid.c
> @@ -69,9 +69,7 @@ static inline int mk_pid(struct pid_name
>   * the scheme scales to up to 4 million PIDs, runtime.
>   */
>  struct pid_namespace init_pid_ns = {
> -	.kref = {
> -		.refcount       = ATOMIC_INIT(2),
> -	},
> +	.kref = INIT_KREF(2),
>  	.pidmap = {
>  		[ 0 ... PIDMAP_ENTRIES-1] = { ATOMIC_INIT(BITS_PER_PAGE), NULL }
>  	},
> diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
> index 7af90fc..33d21e0 100644
> --- a/kernel/user_namespace.c
> +++ b/kernel/user_namespace.c
> @@ -11,9 +11,7 @@
>  #include <linux/user_namespace.h>
> 
>  struct user_namespace init_user_ns = {
> -	.kref = {
> -		.refcount	= ATOMIC_INIT(2),
> -	},
> +	.kref = INIT_KREF(2),
>  	.root_user = &root_user,
>  };
-
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