[IA64] Add interface so modules can discover whether multithreading is on.
Add is_multithreading_enabled() to check whether multi-threading is enabled independently of which cpu is currently online Signed-off-by: stephane eranian <eranian@hpl.hp.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
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@ -879,3 +879,27 @@ identify_siblings(struct cpuinfo_ia64 *c)
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c->core_id = info.log1_cid;
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c->thread_id = info.log1_tid;
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}
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/*
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* returns non zero, if multi-threading is enabled
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* on at least one physical package. Due to hotplug cpu
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* and (maxcpus=), all threads may not necessarily be enabled
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* even though the processor supports multi-threading.
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*/
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int is_multithreading_enabled(void)
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{
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int i, j;
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for_each_present_cpu(i) {
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for_each_present_cpu(j) {
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if (j == i)
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continue;
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if ((cpu_data(j)->socket_id == cpu_data(i)->socket_id)) {
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if (cpu_data(j)->core_id == cpu_data(i)->core_id)
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return 1;
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}
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}
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(is_multithreading_enabled);
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@ -128,6 +128,7 @@ extern void smp_send_reschedule (int cpu);
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extern void lock_ipi_calllock(void);
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extern void unlock_ipi_calllock(void);
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extern void identify_siblings (struct cpuinfo_ia64 *);
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extern int is_multithreading_enabled(void);
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#else
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