linux-kernel - [PATCH 3.10 138/143] kernel/fork.c:copy_process(): unify CLONE_THREAD-or-thread_group

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Message-Id: <20141003213318.613357435@linuxfoundation.org>
Date:	Fri,  3 Oct 2014 14:35:33 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Oleg Nesterov <oleg@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Michal Hocko <mhocko@...e.cz>,
	Pavel Emelyanov <xemul@...allels.com>,
	Sergey Dyasly <dserrg@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Li Zefan <lizefan@...wei.com>
Subject: [PATCH 3.10 138/143] kernel/fork.c:copy_process(): unify CLONE_THREAD-or-thread_group_leader code

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Oleg Nesterov <oleg@...hat.com>

commit 80628ca06c5d42929de6bc22c0a41589a834d151 upstream.

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>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: Michal Hocko <mhocko@...e.cz>
Cc: Pavel Emelyanov <xemul@...allels.com>
Cc: Sergey Dyasly <dserrg@...il.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Li Zefan <lizefan@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/fork.c |   15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1448,14 +1448,6 @@ static struct task_struct *copy_process(
 		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);
 
@@ -1472,6 +1464,13 @@ static struct task_struct *copy_process(
 			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++;


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