On 10/09/2014 07:12 PM, Tadeusz Struk wrote:
> On 10/09/2014 02:42 PM, Prarit Bhargava wrote:
>>>> I don't think cpu hotplug matters here. This is one (probe) time
>>>> determination if the configuration is optimal or not and if it makes
>>>> sense to use this accelerator or not.
>> It absolutely matters. num_online_cpus() *changes* depending on the # of
>> cpus.
>
> Sure, but I still think that we are safe here.
>
No, you're not. Dropping a single CPU changes num_online_cpus(), which results
in
static uint8_t adf_get_dev_node_id(struct pci_dev *pdev)
{
unsigned int bus_per_cpu = 0;
struct cpuinfo_x86 *c = &cpu_data(num_online_cpus() - 1); <<< this
being different.
if (!c->phys_proc_id)
return 0;
bus_per_cpu = 256 / (c->phys_proc_id + 1); <<< this being different
if (bus_per_cpu != 0)
return pdev->bus->number / bus_per_cpu; <<< and this being
different
return 0;
}
P.
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