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Message-ID: <20070111130411.GB15353@us.ibm.com>
Date: Thu, 11 Jan 2007 05:04:11 -0800
From: Sukadev Bhattiprolu <sukadev@...ibm.com>
To: Andrew Morton <akpm@...l.org>
Cc: linux-kernel@...r.kernel.org,
Containers <containers@...ts.osdl.org>, clg@...ibm.com,
"David C. Hansen" <haveblue@...ibm.com>, serue@...ibm.com,
sukadev@...ibm.com
Subject: [PATCH] attach_pid() with struct pid parameter
From: Sukadev Bhattiprolu <sukadev@...ibm.com>
Implement a new version of attach_pid() with a struct pid parameter and
wrap find_attach_pid() around it. attach_pid() would also be used in
subsequent container patches.
Signed-off-by: Sukadev Bhattiprolu <sukadev@...ibm.com>
Cc: Cedric Le Goater <clg@...ibm.com>
Cc: Dave Hansen <haveblue@...ibm.com>
Cc: Serge Hallyn <serue@...ibm.com>
Cc: containers@...ts.osdl.org
---
include/linux/pid.h | 28 +++++++++++++++++-----------
kernel/pid.c | 7 +++----
2 files changed, 20 insertions(+), 15 deletions(-)
Index: lx26-20-rc2-mm1/include/linux/pid.h
===================================================================
--- lx26-20-rc2-mm1.orig/include/linux/pid.h 2007-01-11 04:44:06.674046656 -0800
+++ lx26-20-rc2-mm1/include/linux/pid.h 2007-01-11 04:44:56.820423248 -0800
@@ -72,17 +72,6 @@ extern struct task_struct *FASTCALL(get_
extern struct pid *get_task_pid(struct task_struct *task, enum pid_type type);
/*
- * find_attach_pid() and detach_pid() must be called with the tasklist_lock
- * write-held.
- */
-extern int FASTCALL(find_attach_pid(struct task_struct *task,
- enum pid_type type, int nr));
-
-extern void FASTCALL(detach_pid(struct task_struct *task, enum pid_type));
-extern void FASTCALL(transfer_pid(struct task_struct *old,
- struct task_struct *new, enum pid_type));
-
-/*
* look up a PID in the hash table. Must be called with the tasklist_lock
* or rcu_read_lock() held.
*/
@@ -94,6 +83,23 @@ extern struct pid *FASTCALL(find_pid(int
extern struct pid *find_get_pid(int nr);
extern struct pid *find_ge_pid(int nr);
+/*
+ * attach_pid(), find_attach_pid() and detach_pid() must be called with the
+ * tasklist_lock write-held.
+ */
+extern int FASTCALL(attach_pid(struct task_struct *task, enum pid_type type,
+ struct pid *pid));
+
+static inline int find_attach_pid(struct task_struct *task, enum pid_type type,
+ int nr)
+{
+ return attach_pid(task, type, find_pid(nr));
+}
+
+extern void FASTCALL(detach_pid(struct task_struct *task, enum pid_type));
+extern void FASTCALL(transfer_pid(struct task_struct *old,
+ struct task_struct *new, enum pid_type));
+
extern struct pid *alloc_pid(void);
extern void FASTCALL(free_pid(struct pid *pid));
Index: lx26-20-rc2-mm1/kernel/pid.c
===================================================================
--- lx26-20-rc2-mm1.orig/kernel/pid.c 2007-01-11 04:44:06.674046656 -0800
+++ lx26-20-rc2-mm1/kernel/pid.c 2007-01-11 04:44:56.821423096 -0800
@@ -247,14 +247,13 @@ struct pid * fastcall find_pid(int nr)
}
EXPORT_SYMBOL_GPL(find_pid);
-int fastcall find_attach_pid(struct task_struct *task, enum pid_type type,
- int nr)
+int fastcall attach_pid(struct task_struct *task, enum pid_type type,
+ struct pid *pid)
{
struct pid_link *link;
- struct pid *pid;
link = &task->pids[type];
- link->pid = pid = find_pid(nr);
+ link->pid = pid;
hlist_add_head_rcu(&link->node, &pid->tasks[type]);
return 0;
-
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