1 files changed, 21 insertions, 0 deletions

diff --git a/include/linux/utsname.h b/include/linux/utsname.h
index 923db99175f2..11232676bfff 100644
--- a/include/linux/utsname.h
+++ b/include/linux/utsname.h
@@ -35,6 +35,7 @@ struct new_utsname {
 #include <linux/sched.h>
 #include <linux/kref.h>
 #include <linux/nsproxy.h>
+#include <linux/err.h>
 #include <asm/atomic.h>
 
 struct uts_namespace {
@@ -43,6 +44,7 @@ struct uts_namespace {
 };
 extern struct uts_namespace init_uts_ns;
 
+#ifdef CONFIG_UTS_NS
 static inline void get_uts_ns(struct uts_namespace *ns)
 {
         kref_get(&ns->kref);
@@ -56,6 +58,25 @@ static inline void put_uts_ns(struct uts_namespace *ns)
 {
         kref_put(&ns->kref, free_uts_ns);
 }
+#else
+static inline void get_uts_ns(struct uts_namespace *ns)
+{
+}
+
+static inline void put_uts_ns(struct uts_namespace *ns)
+{
+}
+
+static inline struct uts_namespace *copy_utsname(unsigned long flags,
+                                        struct uts_namespace *ns)
+{
+        if (flags & CLONE_NEWUTS)
+                return ERR_PTR(-EINVAL);
+
+        return ns;
+}
+#endif
+
 static inline struct new_utsname *utsname(void)
 {
         return &current->nsproxy->uts_ns->name;