Uninline the task_xid_nr_ns() calls

Since these are expanded into call to pid_nr_ns() anyway, it's OK to move
the whole routine out-of-line.  This is a cheap way to save ~100 bytes from
vmlinux.  Together with the previous two patches, it saves half-a-kilo from
the vmlinux.

Un-inline other (currently inlined) functions must be done with additional
performance testing.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Paul Menage <menage@google.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/sched.h

@@ -1243,11 +1243,7 @@ static inline pid_t task_pid_nr(struct task_struct *tsk)
 	return tsk->pid;
 }
 
-static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
-		struct pid_namespace *ns)
-{
-	return pid_nr_ns(task_pid(tsk), ns);
-}
+pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
 
 static inline pid_t task_pid_vnr(struct task_struct *tsk)
 {
@@ -1260,11 +1256,7 @@ static inline pid_t task_tgid_nr(struct task_struct *tsk)
 	return tsk->tgid;
 }
 
-static inline pid_t task_tgid_nr_ns(struct task_struct *tsk,
-		struct pid_namespace *ns)
-{
-	return pid_nr_ns(task_tgid(tsk), ns);
-}
+pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
 
 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
 {
@@ -1277,11 +1269,7 @@ static inline pid_t task_pgrp_nr(struct task_struct *tsk)
 	return tsk->signal->pgrp;
 }
 
-static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
-		struct pid_namespace *ns)
-{
-	return pid_nr_ns(task_pgrp(tsk), ns);
-}
+pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
 
 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
 {
@@ -1294,11 +1282,7 @@ static inline pid_t task_session_nr(struct task_struct *tsk)
 	return tsk->signal->__session;
 }
 
-static inline pid_t task_session_nr_ns(struct task_struct *tsk,
-		struct pid_namespace *ns)
-{
-	return pid_nr_ns(task_session(tsk), ns);
-}
+pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
 
 static inline pid_t task_session_vnr(struct task_struct *tsk)
 {

kernel/pid.c

@@ -443,6 +443,30 @@ pid_t pid_nr_ns(struct pid *pid, struct pid_namespace *ns)
 	return nr;
 }
 
+pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
+{
+	return pid_nr_ns(task_pid(tsk), ns);
+}
+EXPORT_SYMBOL(task_pid_nr_ns);
+
+pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
+{
+	return pid_nr_ns(task_tgid(tsk), ns);
+}
+EXPORT_SYMBOL(task_tgid_nr_ns);
+
+pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
+{
+	return pid_nr_ns(task_pgrp(tsk), ns);
+}
+EXPORT_SYMBOL(task_pgrp_nr_ns);
+
+pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
+{
+	return pid_nr_ns(task_session(tsk), ns);
+}
+EXPORT_SYMBOL(task_session_nr_ns);
+
 /*
  * Used by proc to find the first pid that is greater then or equal to nr.
  *