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wait_task_zombie: don't fight with non-existing race with a dying ptracee

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The "p->exit_signal == -1 && p->ptrace == 0" check and the comment are
bogus.  We already did exactly the same check in eligible_child(), we did
not drop tasklist_lock since then, and both variables need
write_lock(tasklist) to be changed.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2007-10-16 23:26:59 -07:00 committed by Linus Torvalds
parent ebca4cda11
commit 442a10cf9e
1 changed files with 0 additions and 7 deletions
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7
kernel/exit.c
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@ -1189,13 +1189,6 @@ static int wait_task_zombie(struct task_struct *p, int noreap,
BUG_ON(state != EXIT_DEAD);
return 0;
}
if (unlikely(p->exit_signal == -1 && p->ptrace == 0)) {
/*
* This can only happen in a race with a ptraced thread
* dying on another processor.
*/
return 0;
}
/* traced means p->ptrace, but not vice versa */
traced = (p->real_parent != p->parent);