linux-kernel - Re: 2.6.29-rc1 does not boot

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Date:	Sun, 11 Jan 2009 20:02:18 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Dieter Ries <clip2@....de>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	travis@....com, rusty@...tcorp.com.au, linux-kernel@...r.kernel.org
Subject: Re: 2.6.29-rc1 does not boot

* Dieter Ries <clip2@....de> wrote:

> Bisected it:
> 
> ####################################################################
> 7503bfbae89eba07b46441a5d1594647f6b8ab7d is first bad commit
> commit 7503bfbae89eba07b46441a5d1594647f6b8ab7d
> Author: Mike Travis <travis@....com>
> Date:   Sun Jan 4 05:18:09 2009 -0800
> 
> cpumask: use work_on_cpu in acpi-cpufreq.c for drv_read and drv_write
> 
> Impact: use new cpumask API to reduce stack usage

thanks, this is very helpful!

Mike, most of the work_on_cpu() patches you did so far were rather 
problematic. Especially something like cpufreq can run rather early during 
bootup or during suspend/resume, so i'm not sure it's correct to rely on 
keventd for it.

I dont see anything particularly wrong in the commit itself - but 
obviously it causes this boot hang - if the bug is not found we'll revert 
it .

Also, this bit in get_cur_val():

+       if (unlikely(!alloc_cpumask_var(&cmd.mask, GFP_KERNEL)))
+               return 0;

how is that supposed to work? If we fail to allocate a cpumask we just 
ignore the call silently? That cannot be right. (but has no connection to 
this boot problem)

	Ingo
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