Re: [PATCH] de_thread: Don't confuse users do_each_thread.

[Oleg Nesterov <oleg@tv-sign.ru>]

On 04/10, Eric W. Biederman wrote:
>
> I believe this is 2.6.17 material as the bug is present in
> 2.6.17-rc1 and the fix is simple.
>
> ...
>
> +		list_del_init(&leader->tasks);

I beleive this is ok for 2.6.17-rc1, but this breaks lockless
for_each_process/while_each_thread (I am talking about -mm tree).

Andrew, could you please drop these ones:

	task-make-task-list-manipulations-rcu-safe-fix.patch
	task-make-task-list-manipulations-rcu-safe-fix-fix.patch

Then we need this "patch" for de_thread:

-		list_add_tail_rcu(&current->tasks, &init_task.tasks);
+		list_replace_rcu(&leader->tasks, &current->tasks);
 ...
-		list_del_init(&leader->tasks);

Currently I don't know how the code looks in -mm tree, I lost the plot.

Oleg.

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