Re: [PATCH][2.5][14/14] smp_call_function_on_cpu - x86_64

From: Zwane Mwaikambo (zwane@holomorphy.com)
Date: Fri Feb 14 2003 - 12:09:19 EST

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In reply to: Andi Kleen: "Re: [PATCH][2.5][14/14] smp_call_function_on_cpu - x86_64"
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On Fri, 14 Feb 2003, Andi Kleen wrote:

> On Fri, Feb 14, 2003 at 07:52:15AM -0500, Zwane Mwaikambo wrote:
> > One liner to fix num_cpus == 0 on SMP kernel w/ UP box
>
> Shouldn't num_cpus be 1 in that case ?

We mask out current cpu first like so;

mask &= ~(1UL << smp_processor_id());
num_cpus = hweight(mask);
if (num_cpus == )
return 0;

So really it's number of eligible IPI cpus

Zwane

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