From: Oleg Nesterov <oleg@redhat.com>
Date: Wed, 22 Jun 2011 21:08:53 +0000 (+0200)
Subject: __ptrace_detach: avoid task_detached(), check do_notify_parent()
X-Git-Tag: v3.1-rc1~308^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9843a1e977977986d0a4c1000f2229b032572534;p=pandora-kernel.git

__ptrace_detach: avoid task_detached(), check do_notify_parent()

__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@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
---

Reading git-diff-tree failed