[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>

diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index 6203ed4..f7d7f56 100644 (file)
--- 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);

diff --git a/include/asm-ia64/smp.h b/include/asm-ia64/smp.h
index 719ff30..6533eb4 100644 (file)
--- a/include/asm-ia64/smp.h
+++ b/include/asm-ia64/smp.h
@@ -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