adding boot_cpu to cpu_online_map query

[R Sharada]

Hello,
	Looking at the ppc64 code, I had a query on how the boot_cpuid is set in
the cpu_online_map.

Looking at prom.c (prom_hold_cpus), I see that the boot cpu is added in the
cpu_online_map:

#ifdef CONFIG_SMP
                else {
                        prom_printf("%x : booting  cpu %s\n", cpuid, path);
                        cpu_set(cpuid, RELOC(cpu_available_map));
                        cpu_set(cpuid, RELOC(cpu_possible_map));
                        cpu_set(cpuid, RELOC(cpu_online_map));
                        cpu_set(cpuid, RELOC(cpu_present_at_boot));
                }
#endif

Again, in start_kernel(), in smp_prepare_boot_cpu(), we again add the boot_cpuid
in the cpu_online_map:

BUG_ON(smp_processor_id() != boot_cpuid);

        /* cpu_possible is set up in prom.c */
        cpu_set(boot_cpuid, cpu_online_map);

        paca[boot_cpuid].__current = current;
        current_set[boot_cpuid] = current->thread_info;

Why is this being done twice for ppc64? Or did I miss something?
I do see that the cpu_set in prom.c is under ifdef CONFIG_SMP. So, for SMP
systems, the cpu_set for boot_cpu will be called twice and for non-SMP, it will
be set in start_kernel?

Thanks and Regards,
Sharada

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