Re: [PATCH] percpu data: only iterate over possible CPUs

[Andrew Morton]

Ashok Raj <ashok.raj@xxxxxxxxx> wrote:
>
> The problem was with ACPI just simply looking at the namespace doesnt
>  exactly give us an idea of how many processors are possible in this platform.

We need to fix this asap - the performance penalty for HOTPLUG_CPU=y,
NR_CPUS=lots will be appreciable.

Do any x86 platforms actually support CPU hotplug?

Does the ACPI problem which you describe occur with present-CPUs,
or only with possible-but-not-present ones?
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