diff options
Diffstat (limited to 'arch/ia64/kernel/smpboot.c')
| -rw-r--r-- | arch/ia64/kernel/smpboot.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c index 6203ed4ec8c..f7d7f566814 100644 --- a/arch/ia64/kernel/smpboot.c +++ b/arch/ia64/kernel/smpboot.c @@ -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); |