ipc: change kern_ipc_perm.deleted type to bool

struct kern_ipc_perm.deleted is meant to be used as a boolean toggle, and
the changes introduced by this patch are just to make the case explicit.

Signed-off-by: Rafael Aquini <aquini@redhat.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Greg Thelen <gthelen@google.com>
Acked-by: Davidlohr Bueso <davidlohr@hp.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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;

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);

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);

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);