"David S. Miller" <[email protected]> wrote:
>
>
> I just noticed this on sparc64, as I lost 31 cpus on my
> Niagara box due to it :)
>
> boot_cpu_init() sets the boot processor ID in cpu_present_map.
>
> But fixup_cpu_present_map() will only populate the cpu_present_map if
> it is empty, which it won't be because of what boot_cpu_init() just
> did.
oops. I guess most architectures set cpu_present_map while bringing up the
APs.
I think it'd be cleanest to require that the arch do that -
fixup_cpu_present_map() looks like a bit of a hack.
I guess if we want to perpetuate fixup_cpu_present_map() then we should
teach it to ignore the boot cpu. (cpus_weight(&cpu_present_map) == 1)
would do that.
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