linux-kernel - [PATCH 2/8] vfork: introduce clone_vfork

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Date:	Wed, 27 Jul 2011 18:32:39 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Roland McGrath <roland@...k.frob.com>,
	Tejun Heo <tj@...nel.org>
Cc:	Denys Vlasenko <dvlasenk@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Matt Fleming <matt.fleming@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/8] vfork: introduce clone_vfork_finish()

No functional changes.

Move the wait-for-vfork_done code from do_wait() into the new
helper, clone_vfork_finish().

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---

 kernel/fork.c |   19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

--- 3.1/kernel/fork.c~2_wait_for_vfork_done	2011-07-26 17:52:25.000000000 +0200
+++ 3.1/kernel/fork.c	2011-07-26 17:52:59.000000000 +0200
@@ -1449,6 +1449,17 @@ void complete_vfork_done(struct task_str
 	complete(vfork_done);
 }
 
+static long clone_vfork_finish(struct task_struct *child,
+				struct completion *vfork_done, long pid)
+{
+	freezer_do_not_count();
+	wait_for_completion(vfork_done);
+	freezer_count();
+
+	ptrace_event(PTRACE_EVENT_VFORK_DONE, pid);
+	return pid;
+}
+
 /*
  *  Ok, this is the main fork-routine.
  *
@@ -1536,12 +1547,8 @@ long do_fork(unsigned long clone_flags,
 		if (unlikely(trace))
 			ptrace_event(trace, nr);
 
-		if (clone_flags & CLONE_VFORK) {
-			freezer_do_not_count();
-			wait_for_completion(&vfork);
-			freezer_count();
-			ptrace_event(PTRACE_EVENT_VFORK_DONE, nr);
-		}
+		if (clone_flags & CLONE_VFORK)
+			nr = clone_vfork_finish(p, &vfork, nr);
 	} else {
 		nr = PTR_ERR(p);
 	}

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