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From: Ingo Molnar <mingo@elte.hu>
To: Tony Luck <tony.luck@gmail.com>
Cc: Roland Dreier <rdreier@cisco.com>,
	David Miller <davem@davemloft.net>,
	linux-kernel@vger.kernel.org
Subject: Re: Strange hang on ia64 with CONFIG_PRINTK_TIME=y
Date: Wed, 20 Feb 2008 09:12:28 +0100	[thread overview]
Message-ID: <20080220081228.GA27036@elte.hu> (raw)
In-Reply-To: <12c511ca0802191440q6a2f5604xe6b563c32c3a90b2@mail.gmail.com>


* Tony Luck <tony.luck@gmail.com> wrote:

> > Perhaps what is happening is that cpu0 comes online ... safely skips 
> > over the early printk calls.  Calls cpu_init() which sets up the 
> > resources *it* needs (ar.k3 points to per-cpu space), and then 
> > executes sched_init() which marks it safe for all printk's. Then 
> > cpu1 comes up and does a printk before it gets to cpu_init().
> 
> I just tried Ingo's patch[1] on a 2.6.25-rc2 kernel with printk 
> timestamps turned on ... and it booted just fine on my tiger4.  The 
> default path for non-boot cpus is from head.S to start_secondary(), 
> and that calls cpu_init() pretty quickly.  There shouldn't normally[2] 
> be any printk() calls on the non-boot cpu before it is safe to do so.

ok. I've queued up the patch again in sched.git, as a .25 fix. Can i add 
your Tested-by and Acked-by tags?

	Ingo

  reply	other threads:[~2008-02-20  8:12 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-13  6:24 Roland Dreier
2008-02-13  7:01 ` David Miller
2008-02-13 12:57   ` Ingo Molnar
2008-02-13 13:02     ` Ingo Molnar
2008-02-14  0:26       ` Roland Dreier
2008-02-13 13:03     ` David Miller
2008-02-13 13:06       ` Ingo Molnar
2008-02-14  0:59       ` Tony Luck
2008-02-14  1:04         ` David Miller
2008-02-14  3:33           ` Tony Luck
2008-02-14  3:47             ` Roland Dreier
2008-02-14 18:24               ` Luck, Tony
2008-02-14 21:27               ` Tony Luck
2008-02-14 22:04                 ` Roland Dreier
2008-02-14 22:23                   ` Luck, Tony
2008-02-15  2:17                     ` Tony Luck
2008-02-19 22:40                       ` Tony Luck
2008-02-20  8:12                         ` Ingo Molnar [this message]
2008-02-20  8:15                           ` David Miller
2008-02-20 23:35                         ` Roland Dreier
2008-02-20 23:36                         ` Roland Dreier

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