tree aa1abba4c643e0f502623870045a4c978db5683b
parent 4576145c1ecdaaea9ef8976a48335206aa1ebf91
author Oleg Nesterov <oleg@redhat.com> 1238716695 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1238724299 -0700

reparent_thread: don't call kill_orphaned_pgrp() if task_detached()

If task_detached(p) == T, then either

  a) p is not the main thread, we will find the group leader on the
     ->children list.

or

  b) p is the group leader but its ->exit_state = EXIT_DEAD.  This
     can only happen when the last sub-thread has died, but in that case
     that thread has already called kill_orphaned_pgrp() from
     exit_notify().

In both cases kill_orphaned_pgrp() looks bogus.

Move the task_detached() check up and simplify the code, this is also
right from the "common sense" pov: we should do nothing with the detached
childs, except move them to the new parent's ->children list.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>