From: Oleg Nesterov <oleg@redhat.com>
Date: Wed, 22 Jun 2011 21:09:39 +0000 (+0200)
Subject: reparent_leader: check EXIT_DEAD instead of task_detached()
X-Git-Tag: v3.1-rc1~308^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0976a03e5ce8ec346e985f21046d7a75bb7fdffd;p=pandora-kernel.git

reparent_leader: check EXIT_DEAD instead of task_detached()

Change reparent_leader() to check ->exit_state instead of ->exit_signal,
this matches the similar EXIT_DEAD check in wait_consider_task() and
allows us to cleanup the do_notify_parent/task_detached logic.

task_detached() was really needed during reparenting before 9cd80bbb
"do_wait() optimization: do not place sub-threads on ->children list"
to filter out the sub-threads. After this change task_detached(p) can
only be true if p is the dead group_leader and its parent ignores
SIGCHLD, in this case the caller of do_notify_parent() is going to
reap this task and it should set EXIT_DEAD.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Tejun Heo <tj@kernel.org>
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