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reparent_leader: check EXIT_DEAD instead of task_detached()

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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>
This commit is contained in:
Oleg Nesterov 2011-06-22 23:09:39 +02:00
parent 8677347378
commit 0976a03e5c
1 changed files with 1 additions and 1 deletions
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2
kernel/exit.c
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@ -742,7 +742,7 @@ static void reparent_leader(struct task_struct *father, struct task_struct *p,
{
list_move_tail(&p->sibling, &p->real_parent->children);
if (task_detached(p))
if (p->exit_state == EXIT_DEAD)
return;
/*
* If this is a threaded reparent there is no need to