linux-kernel - Re: [PATCH] ipc: change kern_ipc

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Date:	Thu, 19 Dec 2013 15:28:43 -0200
From:	Rafael Aquini <aquini@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Davidlohr Bueso <davidlohr@...com>,
	Rik van Riel <riel@...hat.com>,
	Greg Thelen <gthelen@...gle.com>,
	Manfred Spraul <manfred@...orfullife.com>
Subject: Re: [PATCH] ipc: change kern_ipc_perm.deleted type to bool

On Thu, Dec 19, 2013 at 03:23:02PM -0200, Rafael Aquini wrote:
> struct kern_ipc_perm.deleted is meant to be used as a boolean toogle, and
> the changes introduced by this patch are just to make the case explicit.
>
> Signed-off-by: Rafael Aquini <aquini@...hat.com>

s/toogle/toggle

my bad, sorry. shall I resend, or it can be fixed before merging?
 
Thanks,
-- Rafael

> ---
> * a quick sidenote: this patch goes on top of the recently posted
> [PATCH v3] ipc: introduce ipc_valid_object() helper to sort out IPC_RMID races
> 
>  include/linux/ipc.h | 2 +-
>  ipc/sem.c           | 2 +-
>  ipc/util.c          | 6 +++---
>  ipc/util.h          | 2 +-
>  4 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/include/linux/ipc.h b/include/linux/ipc.h
> index 8d861b2..9d84942 100644
> --- a/include/linux/ipc.h
> +++ b/include/linux/ipc.h
> @@ -11,7 +11,7 @@
>  struct kern_ipc_perm
>  {
>  	spinlock_t	lock;
> -	int		deleted;
> +	bool		deleted;
>  	int		id;
>  	key_t		key;
>  	kuid_t		uid;
> diff --git a/ipc/sem.c b/ipc/sem.c
> index 5972e60..1659cd9 100644
> --- a/ipc/sem.c
> +++ b/ipc/sem.c
> @@ -394,7 +394,7 @@ static inline struct sem_array *sem_obtain_lock(struct ipc_namespace *ns,
>  	/* ipc_rmid() may have already freed the ID while sem_lock
>  	 * was spinning: verify that the structure is still valid
>  	 */
> -	if (!ipcp->deleted)
> +	if (ipc_valid_object(ipcp))
>  		return container_of(ipcp, struct sem_array, sem_perm);
>  
>  	sem_unlock(sma, *locknum);
> diff --git a/ipc/util.c b/ipc/util.c
> index 3ae17a4..9dc67fa 100644
> --- a/ipc/util.c
> +++ b/ipc/util.c
> @@ -286,7 +286,7 @@ int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size)
>  	idr_preload(GFP_KERNEL);
>  
>  	spin_lock_init(&new->lock);
> -	new->deleted = 0;
> +	new->deleted = false;
>  	rcu_read_lock();
>  	spin_lock(&new->lock);
>  
> @@ -447,7 +447,7 @@ void ipc_rmid(struct ipc_ids *ids, struct kern_ipc_perm *ipcp)
>  
>  	ids->in_use--;
>  
> -	ipcp->deleted = 1;
> +	ipcp->deleted = true;
>  
>  	return;
>  }
> @@ -657,7 +657,7 @@ struct kern_ipc_perm *ipc_lock(struct ipc_ids *ids, int id)
>  	/* ipc_rmid() may have already freed the ID while ipc_lock
>  	 * was spinning: here verify that the structure is still valid
>  	 */
> -	if (!out->deleted)
> +	if (ipc_valid_object(out))
>  		return out;
>  
>  	spin_unlock(&out->lock);
> diff --git a/ipc/util.h b/ipc/util.h
> index d05b708..a1cbc3a 100644
> --- a/ipc/util.h
> +++ b/ipc/util.h
> @@ -195,7 +195,7 @@ static inline void ipc_unlock(struct kern_ipc_perm *perm)
>   */
>  static inline bool ipc_valid_object(struct kern_ipc_perm *perm)
>  {
> -	return perm->deleted == 0;
> +	return !perm->deleted;
>  }
>  
>  struct kern_ipc_perm *ipc_obtain_object_check(struct ipc_ids *ids, int id);
> -- 
> 1.8.3.1
> 
--
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