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

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Message-ID: <20090918211534.GB19351@redhat.com>
Date:	Fri, 18 Sep 2009 23:15:34 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
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 09/18, Oleg Nesterov wrote:
>
> But personally I still can't understand what happens. If we were
> preempted somewhere before "kthreadd_task = find_task_by_pid_ns()"
> initialization, then schedule_debug() should complain? rest_init()
> runs under preempt_disable().

Ah. CONFIG_PREEMPT_VOLUNTARY means !CONFIG_PREEMPT, and Ingo mentioned
that SMP is disabled, this also means lock_kernel() is noop.

Oleg.

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