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Subject: Re: 2.6.32.21 - uptime related crashes?
From: Peter Zijlstra <peterz@infradead.org>
To: john stultz <johnstul@us.ibm.com>
Cc: Willy Tarreau <w@1wt.eu>, Ingo Molnar <mingo@elte.hu>,
        "MINOURA Makoto / ?$BL'1: ?$B??" <minoura@valinux.co.jp>,
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Date: Fri, 15 Jul 2011 10:30:03 +0200
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On Thu, 2011-07-14 at 17:35 -0700, john stultz wrote:
> 
> Peter/Ingo: Can you take a look at the above and let me know if you find
> it too disagreeable? 

I'm not quite sure of the calling conditions of set_cyc2ns_scale(), but
there's two sites in there that do:

+       local_irq_save(flags);

+               data = kmalloc(sizeof(*data), GFP_KERNEL);

+       local_irq_restore(flags);

Clearly that's not going to work well at all.