linux-kernel - [PATCH 2/3] Prepare pid_nr() etc functions to work with not-NULL pids

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Message-ID: <4703A53B.9090804@openvz.org>
Date:	Wed, 03 Oct 2007 18:20:43 +0400
From:	Pavel Emelyanov <xemul@...nvz.org>
To:	Andrew Morton <akpm@...l.org>
CC:	Sukadev Bhattiprolu <sukadev@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	devel@...nvz.org, Matt Mackall <mpm@...enic.com>
Subject: [PATCH 2/3] Prepare pid_nr() etc functions to work with not-NULL
 pids

Just make the __pid_nr() etc functions that expect the argument
to always be not NULL.

Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>

---

diff --git a/include/linux/pid.h b/include/linux/pid.h
index e29a900..50b6899 100644
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -135,21 +135,32 @@ extern void zap_pid_ns_processes(struct 
  * see also task_xid_nr() etc in include/linux/sched.h
  */
 
+static inline pid_t __pid_nr(struct pid *pid)
+{
+	return pid->numbers[0].nr;
+}
+
 static inline pid_t pid_nr(struct pid *pid)
 {
 	pid_t nr = 0;
 	if (pid)
-		nr = pid->numbers[0].nr;
+		nr = __pid_nr(pid);
 	return nr;
 }
 
+pid_t __pid_nr_ns(struct pid *pid, struct pid_namespace *ns);
 pid_t pid_nr_ns(struct pid *pid, struct pid_namespace *ns);
 
+static inline pid_t __pid_vnr(struct pid *pid)
+{
+	return pid->numbers[pid->level].nr;
+}
+
 static inline pid_t pid_vnr(struct pid *pid)
 {
 	pid_t nr = 0;
 	if (pid)
-		nr = pid->numbers[pid->level].nr;
+		nr = __pid_vnr(pid);
 	return nr;
 }
 
diff --git a/kernel/pid.c b/kernel/pid.c
index d7388d7..b7a11cf 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -430,12 +441,12 @@ struct pid *find_get_pid(pid_t nr)
 	return pid;
 }
 
-pid_t pid_nr_ns(struct pid *pid, struct pid_namespace *ns)
+pid_t __pid_nr_ns(struct pid *pid, struct pid_namespace *ns)
 {
 	struct upid *upid;
 	pid_t nr = 0;
 
-	if (pid && ns->level <= pid->level) {
+	if (ns->level <= pid->level) {
 		upid = &pid->numbers[ns->level];
 		if (upid->ns == ns)
 			nr = upid->nr;
@@ -443,6 +454,14 @@ pid_t pid_nr_ns(struct pid *pid, struct 
 	return nr;
 }
 
+pid_t pid_nr_ns(struct pid *pid, struct pid_namespace *ns)
+{
+	pid_t nr = 0;
+	if (pid)
+		nr = __pid_nr_ns(pid, 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);

-
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