Messages in this thread | | | From | Andy Shevchenko <> | Date | Wed, 14 Mar 2018 19:24:14 +0200 | Subject | Re: [RFC PATCH] ACPI / processor: Get accurate possible CPU count |
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On Wed, Mar 14, 2018 at 12:28 PM, Dou Liyang <douly.fnst@cn.fujitsu.com> wrote:
> +static void __init acpi_update_possible_map(void) > +{ > + unsigned int cpu, nr = 0; > +
> + if (nr_cpu_ids <= nr_unique_ids) > + return; > + > + for_each_possible_cpu(cpu) { > + if (nr >= nr_unique_ids) > + set_cpu_possible(cpu, false); > + nr++; > + }
IIUC this can be optimized to:
if (nr_unique_ids >= nr_cpu_ids) return;
/* Don't yet figure out if it's superfluous */ if (nr_unique_ids >= cpumask_last(cpu_possible_mask)) return;
for_each_cpu_wrap(cpu, cpu_possible_mask, nr_unique_ids) set_cpu_possible(cpu, false);
> + nr_cpu_ids = nr_unique_ids; > + pr_info("Allowing %d possible CPUs\n", nr_cpu_ids); > +}
-- With Best Regards, Andy Shevchenko
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