On Wed, Jan 25, 2006 at 02:31:15PM +0100, Andi Kleen wrote:
> On Monday 23 January 2006 17:46, Eric Dumazet wrote:
>
> I think the best course of action for this now for 2.6.16 is:
>
> - mark percpu init data not __init
> (this way it will still reference valid memory, although shared between
> all impossible CPUs)
> - keep the impossible CPUs per cpu data to point to the original reference
> version (== offset 0)
>
How about doing the above using a debug config option? So that when the
config option is turned on, all per-cpu area references to not possible
cpus crash? and leave that option default on on -mm :). That way we can
quickly catch all references. We can probably change the arch independent
setup_per_cpu_areas also to do allocations for cpu_possible cpus only while
we are at it?
Kiran
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