[Devel] [PATCH -mm] uts namespace : remove CONFIG_UTS_NS

[Cedric Le Goater]

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

Signed-off-by: Cedric Le Goater <clg at fr.ibm.com>
---
 include/linux/utsname.h |   19 -------------------
 init/Kconfig            |    8 --------
 kernel/Makefile         |    3 +--
 kernel/sysctl.c         |    3 +--
 4 files changed, 2 insertions(+), 31 deletions(-)

Index: 2.6.20-rc4-mm1/include/linux/utsname.h
===================================================================
--- 2.6.20-rc4-mm1.orig/include/linux/utsname.h
+++ 2.6.20-rc4-mm1/include/linux/utsname.h
@@ -48,7 +48,6 @@ static inline void get_uts_ns(struct uts
 	kref_get(&ns->kref);
 }
 
-#ifdef CONFIG_UTS_NS
 extern int unshare_utsname(unsigned long unshare_flags,
 				struct uts_namespace **new_uts);
 extern int copy_utsname(int flags, struct task_struct *tsk);
@@ -58,24 +57,6 @@ static inline void put_uts_ns(struct uts
 {
 	kref_put(&ns->kref, free_uts_ns);
 }
-#else
-static inline int unshare_utsname(unsigned long unshare_flags,
-			struct uts_namespace **new_uts)
-{
-	if (unshare_flags & CLONE_NEWUTS)
-		return -EINVAL;
-
-	return 0;
-}
-
-static inline int copy_utsname(int flags, struct task_struct *tsk)
-{
-	return 0;
-}
-static inline void put_uts_ns(struct uts_namespace *ns)
-{
-}
-#endif
 
 static inline struct new_utsname *utsname(void)
 {
Index: 2.6.20-rc4-mm1/init/Kconfig
===================================================================
--- 2.6.20-rc4-mm1.orig/init/Kconfig
+++ 2.6.20-rc4-mm1/init/Kconfig
@@ -205,14 +205,6 @@ config TASK_DELAY_ACCT
 
 	  Say N if unsure.
 
-config UTS_NS
-	bool "UTS Namespaces"
-	default n
-	help
-	  Support uts namespaces.  This allows containers, i.e.
-	  vservers, to use uts namespaces to provide different
-	  uts info for different servers.  If unsure, say N.
-
 config AUDIT
 	bool "Auditing support"
 	depends on NET
Index: 2.6.20-rc4-mm1/kernel/Makefile
===================================================================
--- 2.6.20-rc4-mm1.orig/kernel/Makefile
+++ 2.6.20-rc4-mm1/kernel/Makefile
@@ -8,7 +8,7 @@ obj-y     = sched.o fork.o exec_domain.o
 	    signal.o sys.o kmod.o workqueue.o pid.o \
 	    rcupdate.o extable.o params.o posix-timers.o \
 	    kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \
-	    hrtimer.o rwsem.o latency.o nsproxy.o srcu.o
+	    hrtimer.o rwsem.o latency.o nsproxy.o srcu.o utsname.o
 
 obj-$(CONFIG_STACKTRACE) += stacktrace.o
 obj-y += time/
@@ -48,7 +48,6 @@ obj-$(CONFIG_SECCOMP) += seccomp.o
 obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
 obj-$(CONFIG_DEBUG_SYNCHRO_TEST) += synchro-test.o
 obj-$(CONFIG_RELAY) += relay.o
-obj-$(CONFIG_UTS_NS) += utsname.o
 obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
 obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o
 
Index: 2.6.20-rc4-mm1/kernel/sysctl.c
===================================================================
--- 2.6.20-rc4-mm1.orig/kernel/sysctl.c
+++ 2.6.20-rc4-mm1/kernel/sysctl.c
@@ -187,10 +187,9 @@ int sysctl_legacy_va_layout;
 static void *get_uts(ctl_table *table, int write)
 {
 	char *which = table->data;
-#ifdef CONFIG_UTS_NS
 	struct uts_namespace *uts_ns = current->nsproxy->uts_ns;
 	which = (which - (char *)&init_uts_ns) + (char *)uts_ns;
-#endif
+
 	if (!write)
 		down_read(&uts_sem);
 	else
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