- de_thread-fix-lockless-do_each_thread.patch removed from -mm tree

[akpm@xxxxxxxx]

The patch titled

     de_thread: fix lockless do_each_thread

has been removed from the -mm tree.  Its filename is

     de_thread-fix-lockless-do_each_thread.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
Subject: de_thread: fix lockless do_each_thread
From: Oleg Nesterov <oleg@xxxxxxxxxx>


We should keep the value of old_leader->tasks.next in de_thread, otherwise
we can't do for_each_process/do_each_thread without tasklist_lock held.

Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---

 fs/exec.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff -puN fs/exec.c~de_thread-fix-lockless-do_each_thread fs/exec.c
--- a/fs/exec.c~de_thread-fix-lockless-do_each_thread
+++ a/fs/exec.c
@@ -707,7 +707,7 @@ static int de_thread(struct task_struct 
 		attach_pid(current, PIDTYPE_PID,  current->pid);
 		attach_pid(current, PIDTYPE_PGID, current->signal->pgrp);
 		attach_pid(current, PIDTYPE_SID,  current->signal->session);
-		list_add_tail_rcu(&current->tasks, &init_task.tasks);
+		list_replace_rcu(&leader->tasks, &current->tasks);
 
 		current->group_leader = current;
 		leader->group_leader = current;
@@ -715,7 +715,6 @@ static int de_thread(struct task_struct 
 		/* Reduce leader to a thread */
 		detach_pid(leader, PIDTYPE_PGID);
 		detach_pid(leader, PIDTYPE_SID);
-		list_del_init(&leader->tasks);
 
 		current->exit_signal = SIGCHLD;
 
_

Patches currently in -mm which might be from oleg@xxxxxxxxxx are

origin.patch
sched-uninline-task_rq_lock.patch

-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html