remove CONFIG_UTS_NS and CONFIG_IPC_NS

CONFIG_UTS_NS and CONFIG_IPC_NS have very little value as they only
deactivate the unshare of the uts and ipc namespaces and do not improve
performance.

Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Acked-by: "Serge E. Hallyn" <serue@us.ibm.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Pavel Emelianov <xemul@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 3 insertions, 21 deletions

diff --git a/include/linux/ipc.h b/include/linux/ipc.h
index 7c8c6d8d090c..3fd3ddd5f0d9 100644
--- a/include/linux/ipc.h
+++ b/include/linux/ipc.h
@@ -93,6 +93,7 @@ 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
@@ -104,13 +105,9 @@ static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
 }
 #endif
 
-#ifdef CONFIG_IPC_NS
-extern void free_ipc_ns(struct kref *kref);
-#endif
-
 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
 {
-#ifdef CONFIG_IPC_NS
+#ifdef CONFIG_SYSVIPC
         if (ns)
                 kref_get(&ns->kref);
 #endif
@@ -119,7 +116,7 @@ static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
 
 static inline void put_ipc_ns(struct ipc_namespace *ns)
 {
-#ifdef CONFIG_IPC_NS
+#ifdef CONFIG_SYSVIPC
         kref_put(&ns->kref, free_ipc_ns);
 #endif
 }
@@ -127,5 +124,3 @@ static inline void put_ipc_ns(struct ipc_namespace *ns)
 #endif /* __KERNEL__ */
 
 #endif /* _LINUX_IPC_H */
-
-
diff --git a/include/linux/utsname.h b/include/linux/utsname.h
index f8d3b326e93a..51ad167611e4 100644
--- a/include/linux/utsname.h
+++ b/include/linux/utsname.h
@@ -48,7 +48,6 @@ static inline void get_uts_ns(struct uts_namespace *ns)
         kref_get(&ns->kref);
 }
 
-#ifdef CONFIG_UTS_NS
 extern struct uts_namespace *copy_utsname(int flags, struct uts_namespace *ns);
 extern void free_uts_ns(struct kref *kref);
 
@@ -56,18 +55,6 @@ static inline void put_uts_ns(struct uts_namespace *ns)
 {
         kref_put(&ns->kref, free_uts_ns);
 }
-#else
-static inline struct uts_namespace *copy_utsname(int flags,
-                                                struct uts_namespace *ns)
-{
-        return ns;
-}
-
-static inline void put_uts_ns(struct uts_namespace *ns)
-{
-}
-#endif
-
 static inline struct new_utsname *utsname(void)
 {
         return &current->nsproxy->uts_ns->name;