linux-kernel - [RFC][v7][PATCH 6/9]: Add target_pids parameter to copy

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Message-ID: <20090924170215.GF16989@us.ibm.com>
Date:	Thu, 24 Sep 2009 10:02:15 -0700
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	Oren Laadan <orenl@...columbia.edu>, serue@...ibm.com,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Andrew Morton <akpm@...l.org>, torvalds@...ux-foundation.org,
	mikew@...gle.com, mingo@...e.hu, hpa@...or.com,
	Nathan Lynch <nathanl@...tin.ibm.com>, arnd@...db.de,
	peterz@...radead.org,
	Containers <containers@...ts.linux-foundation.org>,
	sukadev@...ibm.com
Subject: [RFC][v7][PATCH 6/9]: Add target_pids parameter to copy_process()



Subject: [RFC][v7][PATCH 6/9]: Add target_pids parameter to copy_process()

Add a 'target_pids' parameter to copy_process().  The new parameter will be
used in a follow-on patch when clone_with_pids() is implemented.

Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Acked-by: Serge Hallyn <serue@...ibm.com>
Reviewed-by: Oren Laadan <orenl@...columbia.edu>
---
 kernel/fork.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Index: linux-2.6/kernel/fork.c
===================================================================
--- linux-2.6.orig/kernel/fork.c	2009-09-10 10:29:10.000000000 -0700
+++ linux-2.6/kernel/fork.c	2009-09-10 10:29:13.000000000 -0700
@@ -935,12 +935,12 @@ static struct task_struct *copy_process(
 					unsigned long stack_size,
 					int __user *child_tidptr,
 					struct pid *pid,
+					pid_t *target_pids,
 					int trace)
 {
 	int retval;
 	struct task_struct *p;
 	int cgroup_callbacks_done = 0;
-	pid_t *target_pids = NULL;
 
 	if ((clone_flags & (CLONE_NEWNS|CLONE_FS)) == (CLONE_NEWNS|CLONE_FS))
 		return ERR_PTR(-EINVAL);
@@ -1319,7 +1319,7 @@ struct task_struct * __cpuinit fork_idle
 	struct pt_regs regs;
 
 	task = copy_process(CLONE_VM, 0, idle_regs(&regs), 0, NULL,
-			    &init_struct_pid, 0);
+			    &init_struct_pid, NULL, 0);
 	if (!IS_ERR(task))
 		init_idle(task, cpu);
 
@@ -1342,6 +1342,7 @@ long do_fork(unsigned long clone_flags,
 	struct task_struct *p;
 	int trace = 0;
 	long nr;
+	pid_t *target_pids = NULL;
 
 	/*
 	 * Do some preliminary argument and permissions checking before we
@@ -1382,7 +1383,7 @@ long do_fork(unsigned long clone_flags,
 		trace = tracehook_prepare_clone(clone_flags);
 
 	p = copy_process(clone_flags, stack_start, regs, stack_size,
-			 child_tidptr, NULL, trace);
+			 child_tidptr, NULL, target_pids, trace);
 	/*
 	 * Do this prior waking up the new thread - the thread pointer
 	 * might get invalid after that point, if the thread exits quickly.
--
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