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Message-ID: <4747DE84.8040302@kolumbus.fi>
Date: Sat, 24 Nov 2007 10:19:16 +0200
From: Mika Penttilä <mika.penttila@...umbus.fi>
To: Oleg Nesterov <oleg@...sign.ru>
CC: Andrew Morton <akpm@...ux-foundation.org>,
Roland McGrath <roland@...hat.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm 1/2] wait_task_stopped: remove unneeded delay_group_leader
check
> wait_task_stopped() doesn't need the "delay_group_leader" parameter. If the
> child is not traced it must be a group leader. With or without subthreads
>
What do you mean "has to be a group leader"? It could be a stopped thread.
> ->group_stop_count == 0 when the whole task is stopped.
>
>
> Signed-off-by: Oleg Nesterov <oleg@...sign.ru>
>
> --- PT/kernel/exit.c~5_ck_group_stop 2007-11-22 19:08:43.000000000 +0300
> +++ PT/kernel/exit.c 2007-11-23 20:31:21.000000000 +0300
> @@ -1348,7 +1348,7 @@ static int wait_task_zombie(struct task_
> * the lock and this task is uninteresting. If we return nonzero, we have
> * released the lock and the system call should return.
> */
> -static int wait_task_stopped(struct task_struct *p, int delayed_group_leader,
> +static int wait_task_stopped(struct task_struct *p,
> int noreap, struct siginfo __user *infop,
> int __user *stat_addr, struct rusage __user *ru)
> {
> @@ -1362,8 +1362,7 @@ static int wait_task_stopped(struct task
> if (unlikely(!is_task_stopped_or_traced(p)))
> goto unlock_sig;
>
> - if (delayed_group_leader && !(p->ptrace & PT_PTRACED) &&
> - p->signal->group_stop_count > 0)
> + if (!(p->ptrace & PT_PTRACED) && p->signal->group_stop_count > 0)
> /*
> * A group stop is in progress and this is the group leader.
> * We won't report until all threads have stopped.
> @@ -1519,7 +1518,7 @@ repeat:
> !(options & WUNTRACED))
> continue;
>
> - retval = wait_task_stopped(p, ret == 2,
> + retval = wait_task_stopped(p,
> (options & WNOWAIT), infop,
> stat_addr, ru);
> } else if (p->exit_state == EXIT_ZOMBIE) {
>
> -
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>
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