Re: [PATCH][2.5][8/14] smp_call_function_on_cpu - s390

From: Ulrich Weigand (
Date: Sat Feb 15 2003 - 17:07:01 EST

Zwane Mwaikambo wrote:

> This could be achieved if s390 (or if we had a generic one, this is
> another story...) had a for_each_cpu type iterator, which would also
> cover aforementioned mask &= cpu_online_map issue, but as an aside, it is
> harder to track down lockups from things like IPIs to invalid cpus than a busy loop
> waiting for num_cpus.

I'm not sure I understand what you mean here. In any case, at least
on S/390, doing a SIGP to an invalid CPU will simply get you an
'not operational' indication (condition code 3), so in fact the
only problem *is* the busy loop on num_cpus ...


  Dr. Ulrich Weigand
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