linux-kernel - Re: [PATCH 0/1] kthreads: simplify !kthreadd_task logic, kill kthreadd_task_init

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Date:	Fri, 18 Sep 2009 12:17:58 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Oleg Nesterov <oleg@...hat.com>
cc:	Wu Fei <at.wufei@...il.com>, Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, arjan@...radead.org,
	jeremy@...p.org, mschmidt@...hat.com, mingo@...hat.com,
	hpa@...or.com, linux-kernel@...r.kernel.org, tj@...nel.org,
	tglx@...utronix.de, Andrew Morton <akpm@...ux-foundation.org>,
	linux-tip-commits@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH 0/1] kthreads: simplify !kthreadd_task logic, kill
 kthreadd_task_init_done



On Fri, 18 Sep 2009, Oleg Nesterov wrote:
> >  	rcu_scheduler_starting();
> > -	kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
> > -	numa_default_policy();
> >  	pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
> >  	kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
> > +	kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
> 
> We can't do this. kernel_init() should run with ->pid == 1, we are
> going to exec /sbin/init.

Umm - why not just add CLONE_PID to the 'kthreadd' creation, then?

		Linus
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