From 442a10cf9e1c350b4de4dd6f22c72618a0b13d7f Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Tue, 16 Oct 2007 23:26:59 -0700 Subject: [PATCH] wait_task_zombie: don't fight with non-existing race with a dying ptracee 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 Cc: Roland McGrath Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/exit.c | 7 ------- 1 file changed, 7 deletions(-) diff --git a/kernel/exit.c b/kernel/exit.c index 28144b94e55c..b27a3dcde671 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -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); -- 2.20.1