Re: [Linux-ia64] [patch] logical CPU numbering

Martin Hicks
2003-03-25T18:03:55Z

On Thu, Mar 20, 2003 at 12:07:32PM -0800, Wichmann, Mats D wrote:
>
> > If a CPU fails to start during smp_boot_cpus(), then the logical CPU
> > numbering gets will have a "hole". Using the number of booted CPU's
> > instead of the loop index will correct this.
>
> Just curious, does having a hole cause a problem?
> It might well; I don't know.
>
> I consider some future scenario where if cpu X
> didn't come up, it can be hot-replaced, at which
> point one might actually want to have that "slot"
> reserved for it.

I thought there was some code that depended on having logical cpus
numbered without holes. I can't find any evidence of it anymore, so
perhaps its not a bug.