Re: [PATCH 0/3] percpu: Optimize percpu accesses

[Mike Travis]

Ingo Molnar wrote:
...
> 
> tried it on x86.git and 1/3 did not build and 2/3 causes a boot hang 
> with the attached .config.
> 
> 	Ingo
> 

I've tracked down the failure to an early printk that when CONFIG_PRINTK_TIME
is enabled, any early printks cause cpu_clock to be called, which accesses
cpu_rq which is defined as:

 595 #define cpu_rq(cpu)             (&per_cpu(runqueues, (cpu)))

Since the zero-based patch is changing the offset from one based on
__per_cpu_start to zero, it's causing the function to access a
different area.

I'm working on a fix now.

Thanks,
Mike
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