[PATCH -mm] ipc namespace : remove CONFIG_IPC_NS

[Cedric Le Goater <clg@fr.ibm.com>]

CONFIG_IPC_NS has very little value as it only deactivates the unshare 
of the ipc namespace and does not improve performance.

Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
---
 include/linux/ipc.h |   11 -----------
 init/Kconfig        |    9 ---------
 ipc/msg.c           |    4 +---
 ipc/sem.c           |    4 +---
 ipc/shm.c           |    4 +---
 ipc/util.c          |    4 +---
 ipc/util.h          |    8 ++------
 kernel/fork.c       |   10 ----------
 8 files changed, 6 insertions(+), 48 deletions(-)

Index: 2.6.20-rc4-mm1/include/linux/ipc.h
===================================================================
--- 2.6.20-rc4-mm1.orig/include/linux/ipc.h
+++ 2.6.20-rc4-mm1/include/linux/ipc.h
@@ -96,31 +96,20 @@ extern struct ipc_namespace init_ipc_ns;
 #define INIT_IPC_NS(ns)
 #endif
 
-#ifdef CONFIG_IPC_NS
 extern void free_ipc_ns(struct kref *kref);
 extern int copy_ipcs(unsigned long flags, struct task_struct *tsk);
 extern int unshare_ipcs(unsigned long flags, struct ipc_namespace **ns);
-#else
-static inline int copy_ipcs(unsigned long flags, struct task_struct *tsk)
-{
-	return 0;
-}
-#endif
 
 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
 {
-#ifdef CONFIG_IPC_NS
 	if (ns)
 		kref_get(&ns->kref);
-#endif
 	return ns;
 }
 
 static inline void put_ipc_ns(struct ipc_namespace *ns)
 {
-#ifdef CONFIG_IPC_NS
 	kref_put(&ns->kref, free_ipc_ns);
-#endif
 }
 
 #endif /* __KERNEL__ */
Index: 2.6.20-rc4-mm1/init/Kconfig
===================================================================
--- 2.6.20-rc4-mm1.orig/init/Kconfig
+++ 2.6.20-rc4-mm1/init/Kconfig
@@ -138,15 +138,6 @@ config SYSVIPC
 	  section 6.4 of the Linux Programmer's Guide, available from
 	  <http://www.tldp.org/guides.html>.
 
-config IPC_NS
-	bool "IPC Namespaces"
-	depends on SYSVIPC
-	default n
-	help
-	  Support ipc namespaces.  This allows containers, i.e. virtual
-	  environments, to use ipc namespaces to provide different ipc
-	  objects for different servers.  If unsure, say N.
-
 config POSIX_MQUEUE
 	bool "POSIX Message Queues"
 	depends on NET && EXPERIMENTAL
Index: 2.6.20-rc4-mm1/ipc/msg.c
===================================================================
--- 2.6.20-rc4-mm1.orig/ipc/msg.c
+++ 2.6.20-rc4-mm1/ipc/msg.c
@@ -87,7 +87,7 @@ static int newque (struct ipc_namespace 
 static int sysvipc_msg_proc_show(struct seq_file *s, void *it);
 #endif
 
-static void __ipc_init __msg_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids)
+static void __msg_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids)
 {
 	ns->ids[IPC_MSG_IDS] = ids;
 	ns->msg_ctlmax = MSGMAX;
@@ -96,7 +96,6 @@ static void __ipc_init __msg_init_ns(str
 	ipc_init_ids(ids, ns->msg_ctlmni);
 }
 
-#ifdef CONFIG_IPC_NS
 int msg_init_ns(struct ipc_namespace *ns)
 {
 	struct ipc_ids *ids;
@@ -128,7 +127,6 @@ void msg_exit_ns(struct ipc_namespace *n
 	kfree(ns->ids[IPC_MSG_IDS]);
 	ns->ids[IPC_MSG_IDS] = NULL;
 }
-#endif
 
 void __init msg_init(void)
 {
Index: 2.6.20-rc4-mm1/ipc/sem.c
===================================================================
--- 2.6.20-rc4-mm1.orig/ipc/sem.c
+++ 2.6.20-rc4-mm1/ipc/sem.c
@@ -122,7 +122,7 @@ static int sysvipc_sem_proc_show(struct 
 #define sc_semopm	sem_ctls[2]
 #define sc_semmni	sem_ctls[3]
 
-static void __ipc_init __sem_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids)
+static void __sem_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids)
 {
 	ns->ids[IPC_SEM_IDS] = ids;
 	ns->sc_semmsl = SEMMSL;
@@ -133,7 +133,6 @@ static void __ipc_init __sem_init_ns(str
 	ipc_init_ids(ids, ns->sc_semmni);
 }
 
-#ifdef CONFIG_IPC_NS
 int sem_init_ns(struct ipc_namespace *ns)
 {
 	struct ipc_ids *ids;
@@ -165,7 +164,6 @@ void sem_exit_ns(struct ipc_namespace *n
 	kfree(ns->ids[IPC_SEM_IDS]);
 	ns->ids[IPC_SEM_IDS] = NULL;
 }
-#endif
 
 void __init sem_init (void)
 {
Index: 2.6.20-rc4-mm1/ipc/shm.c
===================================================================
--- 2.6.20-rc4-mm1.orig/ipc/shm.c
+++ 2.6.20-rc4-mm1/ipc/shm.c
@@ -67,7 +67,7 @@ static void shm_destroy (struct ipc_name
 static int sysvipc_shm_proc_show(struct seq_file *s, void *it);
 #endif
 
-static void __ipc_init __shm_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids)
+static void __shm_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids)
 {
 	ns->ids[IPC_SHM_IDS] = ids;
 	ns->shm_ctlmax = SHMMAX;
@@ -88,7 +88,6 @@ static void do_shm_rmid(struct ipc_names
 		shm_destroy(ns, shp);
 }
 
-#ifdef CONFIG_IPC_NS
 int shm_init_ns(struct ipc_namespace *ns)
 {
 	struct ipc_ids *ids;
@@ -120,7 +119,6 @@ void shm_exit_ns(struct ipc_namespace *n
 	kfree(ns->ids[IPC_SHM_IDS]);
 	ns->ids[IPC_SHM_IDS] = NULL;
 }
-#endif
 
 void __init shm_init (void)
 {
Index: 2.6.20-rc4-mm1/ipc/util.c
===================================================================
--- 2.6.20-rc4-mm1.orig/ipc/util.c
+++ 2.6.20-rc4-mm1/ipc/util.c
@@ -51,7 +51,6 @@ struct ipc_namespace init_ipc_ns = {
 	},
 };
 
-#ifdef CONFIG_IPC_NS
 static struct ipc_namespace *clone_ipc_ns(struct ipc_namespace *old_ns)
 {
 	int err;
@@ -144,7 +143,6 @@ void free_ipc_ns(struct kref *kref)
 	shm_exit_ns(ns);
 	kfree(ns);
 }
-#endif
 
 /**
  *	ipc_init	-	initialise IPC subsystem
@@ -172,7 +170,7 @@ __initcall(ipc_init);
  *	array itself. 
  */
  
-void __ipc_init ipc_init_ids(struct ipc_ids* ids, int size)
+void ipc_init_ids(struct ipc_ids* ids, int size)
 {
 	int i;
 
Index: 2.6.20-rc4-mm1/ipc/util.h
===================================================================
--- 2.6.20-rc4-mm1.orig/ipc/util.h
+++ 2.6.20-rc4-mm1/ipc/util.h
@@ -41,12 +41,8 @@ struct ipc_ids {
 };
 
 struct seq_file;
-#ifdef CONFIG_IPC_NS
-#define __ipc_init
-#else
-#define __ipc_init	__init
-#endif
-void __ipc_init ipc_init_ids(struct ipc_ids *ids, int size);
+
+void ipc_init_ids(struct ipc_ids *ids, int size);
 #ifdef CONFIG_PROC_FS
 void __init ipc_init_proc_interface(const char *path, const char *header,
 		int ids, int (*show)(struct seq_file *, void *));
Index: 2.6.20-rc4-mm1/kernel/fork.c
===================================================================
--- 2.6.20-rc4-mm1.orig/kernel/fork.c
+++ 2.6.20-rc4-mm1/kernel/fork.c
@@ -1595,16 +1595,6 @@ static int unshare_semundo(unsigned long
 	return 0;
 }
 
-#ifndef CONFIG_IPC_NS
-static inline int unshare_ipcs(unsigned long flags, struct ipc_namespace **ns)
-{
-	if (flags & CLONE_NEWIPC)
-		return -EINVAL;
-
-	return 0;
-}
-#endif
-
 /*
  * unshare allows a process to 'unshare' part of the process
  * context which was originally shared using clone.  copy_*
-
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