linux-kernel - Re: Strange hang on ia64 with CONFIG_PRINTK

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Date:	Wed, 20 Feb 2008 00:15:05 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	mingo@...e.hu
Cc:	tony.luck@...il.com, rdreier@...co.com,
	linux-kernel@...r.kernel.org
Subject: Re: Strange hang on ia64 with CONFIG_PRINTK_TIME=y

From: Ingo Molnar <mingo@...e.hu>
Date: Wed, 20 Feb 2008 09:12:28 +0100

> 
> * Tony Luck <tony.luck@...il.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?

Acked-by: David S. Miller <davem@...emloft.net>
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