Commit dd562c05 authored by Stephane Eranian's avatar Stephane Eranian Committed by Tony Luck

[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: default avatarstephane eranian <eranian@hpl.hp.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent fd32cb3a
......@@ -879,3 +879,27 @@ identify_siblings(struct cpuinfo_ia64 *c)
c->core_id = info.log1_cid;
c->thread_id = info.log1_tid;
}
/*
* returns non zero, if multi-threading is enabled
* on at least one physical package. Due to hotplug cpu
* and (maxcpus=), all threads may not necessarily be enabled
* even though the processor supports multi-threading.
*/
int is_multithreading_enabled(void)
{
int i, j;
for_each_present_cpu(i) {
for_each_present_cpu(j) {
if (j == i)
continue;
if ((cpu_data(j)->socket_id == cpu_data(i)->socket_id)) {
if (cpu_data(j)->core_id == cpu_data(i)->core_id)
return 1;
}
}
}
return 0;
}
EXPORT_SYMBOL_GPL(is_multithreading_enabled);
......@@ -128,6 +128,7 @@ extern void smp_send_reschedule (int cpu);
extern void lock_ipi_calllock(void);
extern void unlock_ipi_calllock(void);
extern void identify_siblings (struct cpuinfo_ia64 *);
extern int is_multithreading_enabled(void);
#else
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment