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Subject: Re: [PATCH] sched: RCU-protect __set_task_cpu() in set_task_cpu()
From: Peter Zijlstra <peterz@infradead.org>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Ingo Molnar <mingo@elte.hu>, Andrew Morton <akpm@linux-foundation.org>,
        linux-kernel@vger.kernel.org
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Date: Mon, 06 Jun 2011 15:43:22 +0200
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On Sun, 2011-06-05 at 21:12 +0200, Oleg Nesterov wrote:
> 
>         WARN_ON_ONCE(debug_locks && !lockdep_is_held(p->on_rq ?
>                                         &task_rq(p)->lock : &p->pi_lock))
> 
> Not that I really suggest to change this WARN_ON(), I am just trying
> to recall the new rules. 

I actually like that, so I tried it, we need to clean up some of the
fork() path hacks but it should be possible. Will try and remember for
the next release or so.