Re: [PATCH 3/8] __ptrace_detach: avoid task_detached(), checkdo_notify_parent()

From: Tejun Heo
Date: Thu Jun 23 2011 - 09:25:43 EST

On Wed, Jun 22, 2011 at 11:08:53PM +0200, Oleg Nesterov wrote:
> __ptrace_detach() relies on the current obscure behaviour of
> do_notify_parent(tsk) which changes tsk->exit_signal if this child
> should be silently reaped. That is why we check task_detached(), it
> is true if the task is sub-thread, or it is the group_leader but
> its exit_signal was changed by do_notify_parent().
> This is confusing, change the code to rely on !thread_group_leader()
> or the value returned by do_notify_parent().
> Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>

This looks good to me.

Acked-by: Tejun Heo <tj@xxxxxxxxxx>


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