2 files changed, 69 insertions, 52 deletions

diff --git a/include/linux/ipc.h b/include/linux/ipc.h
index 408696ea5189..b8826107b518 100644
--- a/include/linux/ipc.h
+++ b/include/linux/ipc.h
@@ -100,58 +100,6 @@ struct kern_ipc_perm
         void            *security;
 };
 
-struct ipc_ids;
-struct ipc_namespace {
-        struct kref     kref;
-        struct ipc_ids  *ids[3];
-
-        int             sem_ctls[4];
-        int             used_sems;
-
-        int             msg_ctlmax;
-        int             msg_ctlmnb;
-        int             msg_ctlmni;
-        atomic_t        msg_bytes;
-        atomic_t        msg_hdrs;
-
-        size_t          shm_ctlmax;
-        size_t          shm_ctlall;
-        int             shm_ctlmni;
-        int             shm_tot;
-};
-
-extern struct ipc_namespace init_ipc_ns;
-
-#ifdef CONFIG_SYSVIPC
-#define INIT_IPC_NS(ns)         .ns             = &init_ipc_ns,
-extern void free_ipc_ns(struct kref *kref);
-extern struct ipc_namespace *copy_ipcs(unsigned long flags,
-                                                struct ipc_namespace *ns);
-#else
-#define INIT_IPC_NS(ns)
-static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
-                                                struct ipc_namespace *ns)
-{
-        return ns;
-}
-#endif
-
-static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
-{
-#ifdef CONFIG_SYSVIPC
-        if (ns)
-                kref_get(&ns->kref);
-#endif
-        return ns;
-}
-
-static inline void put_ipc_ns(struct ipc_namespace *ns)
-{
-#ifdef CONFIG_SYSVIPC
-        kref_put(&ns->kref, free_ipc_ns);
-#endif
-}
-
 #endif /* __KERNEL__ */
 
 #endif /* _LINUX_IPC_H */
diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h
new file mode 100644
index 000000000000..a491fc9dd231
--- /dev/null
+++ b/include/linux/ipc_namespace.h
@@ -0,0 +1,69 @@
+#ifndef __IPC_NAMESPACE_H__
+#define __IPC_NAMESPACE_H__
+
+#include <linux/err.h>
+
+struct ipc_ids;
+struct ipc_namespace {
+        struct kref     kref;
+        struct ipc_ids  *ids[3];
+
+        int             sem_ctls[4];
+        int             used_sems;
+
+        int             msg_ctlmax;
+        int             msg_ctlmnb;
+        int             msg_ctlmni;
+        atomic_t        msg_bytes;
+        atomic_t        msg_hdrs;
+
+        size_t          shm_ctlmax;
+        size_t          shm_ctlall;
+        int             shm_ctlmni;
+        int             shm_tot;
+};
+
+extern struct ipc_namespace init_ipc_ns;
+
+#ifdef CONFIG_SYSVIPC
+#define INIT_IPC_NS(ns)         .ns             = &init_ipc_ns,
+#else
+#define INIT_IPC_NS(ns)
+#endif
+
+#if defined(CONFIG_SYSVIPC) && defined(CONFIG_IPC_NS)
+extern void free_ipc_ns(struct kref *kref);
+extern struct ipc_namespace *copy_ipcs(unsigned long flags,
+                                                struct ipc_namespace *ns);
+
+static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
+{
+        if (ns)
+                kref_get(&ns->kref);
+        return ns;
+}
+
+static inline void put_ipc_ns(struct ipc_namespace *ns)
+{
+        kref_put(&ns->kref, free_ipc_ns);
+}
+#else
+static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
+                struct ipc_namespace *ns)
+{
+        if (flags & CLONE_NEWIPC)
+                return ERR_PTR(-EINVAL);
+
+        return ns;
+}
+
+static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
+{
+        return ns;
+}
+
+static inline void put_ipc_ns(struct ipc_namespace *ns)
+{
+}
+#endif
+#endif