[Devel] [PATCH 3/3] Use the __pid_nr() calls where appropriate

[Pavel Emelyanov]

Since we now have all the tasks have non-zero pids we may 
call the __pid_nr() instead of pid_nr() when the pid is 
get from task with task_pid() or similar call.

Besides, there are some other places where the check for 
pid to be not NULL is already done, so change them too.

Signed-off-by: Pavel Emelyanov <xemul at openvz.org>

---

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 6ea12de..d94fda9 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2394,7 +2394,7 @@ retry:
 	task = NULL;
 	pid = find_ge_pid(tgid, ns);
 	if (pid) {
-		tgid = pid_nr_ns(pid, ns) + 1;
+		tgid = __pid_nr_ns(pid, ns) + 1;
 		task = pid_task(pid, PIDTYPE_PID);
 		/* What we to know is if the pid we have find is the
 		 * pid of a thread_group_leader.  Testing for task
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 4f21af1..e17b8f8 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1229,7 +1229,7 @@ pid_t task_pid_nr_ns(struct task_struct 
 
 static inline pid_t task_pid_vnr(struct task_struct *tsk)
 {
-	return pid_vnr(task_pid(tsk));
+	return __pid_vnr(task_pid(tsk));
 }
 
 
@@ -1242,7 +1242,7 @@ pid_t task_tgid_nr_ns(struct task_struct
 
 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
 {
-	return pid_vnr(task_tgid(tsk));
+	return __pid_vnr(task_tgid(tsk));
 }
 
 
@@ -1255,7 +1255,7 @@ pid_t task_pgrp_nr_ns(struct task_struct
 
 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
 {
-	return pid_vnr(task_pgrp(tsk));
+	return __pid_vnr(task_pgrp(tsk));
 }
 
 
@@ -1268,14 +1268,14 @@ pid_t task_session_nr_ns(struct task_str
 
 static inline pid_t task_session_vnr(struct task_struct *tsk)
 {
-	return pid_vnr(task_session(tsk));
+	return __pid_vnr(task_session(tsk));
 }
 
 
 static inline pid_t task_ppid_nr_ns(struct task_struct *tsk,
 		struct pid_namespace *ns)
 {
-	return pid_nr_ns(task_pid(rcu_dereference(tsk->real_parent)), ns);
+	return __pid_nr_ns(task_pid(rcu_dereference(tsk->real_parent)), ns);
 }
 
 /**
diff --git a/kernel/fork.c b/kernel/fork.c
index f85731a..b640a10 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1161,7 +1161,7 @@ static struct task_struct *copy_process(
 		}
 	}
 
-	p->pid = pid_nr(pid);
+	p->pid = __pid_nr(pid);
 	p->tgid = p->pid;
 	if (clone_flags & CLONE_THREAD)
 		p->tgid = current->tgid;
diff --git a/kernel/pid.c b/kernel/pid.c
index d7388d7..b7a11cf 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -88,7 +99,7 @@ int is_cgroup_init(struct task_struct *t
 
 	rcu_read_lock();
 	pid = task_pid(tsk);
-	if (pid != NULL && pid->numbers[pid->level].nr == 1)
+	if (pid->numbers[pid->level].nr == 1)
 		ret = 1;
 	rcu_read_unlock();
 
@@ -443,25 +454,25 @@ pid_t pid_nr_ns(struct pid *pid, struct 
 
 pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
 {
-	return pid_nr_ns(task_pid(tsk), 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);
+	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);
+	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);
+	return __pid_nr_ns(task_session(tsk), ns);
 }
 EXPORT_SYMBOL(task_session_nr_ns);
 
diff --git a/kernel/sys.c b/kernel/sys.c
index 796299c..fa187d2 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -975,7 +975,7 @@ asmlinkage long sys_setpgid(pid_t pid, p
 		detach_pid(p, PIDTYPE_PGID);
 		pid = find_vpid(pgid);
 		attach_pid(p, PIDTYPE_PGID, pid);
-		set_task_pgrp(p, pid_nr(pid));
+		set_task_pgrp(p, __pid_nr(pid));
 	}
 
 	err = 0;
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index b11d22b..9bda3b5 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2286,7 +2286,7 @@ static int proc_do_cad_pid(struct ctl_ta
 	pid_t tmp;
 	int r;
 
-	tmp = pid_nr_ns(cad_pid, current->nsproxy->pid_ns);
+	tmp = __pid_nr_ns(cad_pid, current->nsproxy->pid_ns);
 
 	r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
 			       lenp, ppos, NULL, NULL);