linux-kernel - [PATCH 2/4] copy_process: unify CLONE_THREAD-or-thread_group

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Message-ID: <20130609170026.GA5236@redhat.com>
Date:	Sun, 9 Jun 2013 19:00:26 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Michal Hocko <mhocko@...e.cz>,
	Pavel Emelyanov <xemul@...allels.com>,
	Sergey Dyasly <dserrg@...il.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] copy_process: unify
	CLONE_THREAD-or-thread_group_leader code

Cleanup and preparation for the next changes.

Move the "if (clone_flags & CLONE_THREAD)" code down under
"if (likely(p->pid))" and turn it into into the "else" branch.
This makes the process/thread initialization more symmetrical
and removes one check.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 kernel/fork.c |   15 +++++++--------
 1 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index 987b28a..7bc4146 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1446,14 +1446,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 		goto bad_fork_free_pid;
 	}
 
-	if (clone_flags & CLONE_THREAD) {
-		current->signal->nr_threads++;
-		atomic_inc(&current->signal->live);
-		atomic_inc(&current->signal->sigcnt);
-		p->group_leader = current->group_leader;
-		list_add_tail_rcu(&p->thread_group, &p->group_leader->thread_group);
-	}
-
 	if (likely(p->pid)) {
 		ptrace_init_task(p, (clone_flags & CLONE_PTRACE) || trace);
 
@@ -1470,6 +1462,13 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 			list_add_tail(&p->sibling, &p->real_parent->children);
 			list_add_tail_rcu(&p->tasks, &init_task.tasks);
 			__this_cpu_inc(process_counts);
+		} else {
+			current->signal->nr_threads++;
+			atomic_inc(&current->signal->live);
+			atomic_inc(&current->signal->sigcnt);
+			p->group_leader = current->group_leader;
+			list_add_tail_rcu(&p->thread_group,
+					  &p->group_leader->thread_group);
 		}
 		attach_pid(p, PIDTYPE_PID, pid);
 		nr_threads++;
-- 
1.5.5.1

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