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Date:	Thu, 20 Mar 2014 09:06:34 -0500 (CDT)
From:	Christoph Lameter <>
To:	Andrew Morton <>
cc:	Grygorii Strashko <>,
	linux-arm <>,
	Tejun Heo <>,,
	Santosh Shilimkar <>,
	Ingo Molnar <>
Subject: Re: [linux-next][regression] [PATCH] percpu: add preemption checks
 to __this_cpu ops

On Tue, 18 Mar 2014, Andrew Morton wrote:

> > snprintf can cause hangs.
> This is weird.  How the heck can snprintf() fail if called too early?
> All it does is shuffle chars around in memory.  The only external
> dependency I'm seeing is a WARN_ON() which presumably didn't trigger
> anyway.
> I'm suspecting a misdiagnosis here.  Otherwise, we seriously need to
> fix snprintf(), not work around it!
> Also, what does "before checking error conditions" refer to?  Does this
> mean you know why snprintf() failed??

No I dont. I only know that this fixes Grygorii's issues. There could be
numerous arch specific per cpu setup issues going on that may impact on

If I move it behind the checks then I can avoid using snprintf.
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