[IA64] Add interface so modules can discover whether multithreading is on.

[linux-2.6] / arch / ia64 / kernel / smpboot.c

diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index e1960979be29d082b09d2e767393d182a526238c..f7d7f5668144fcec8e76bcadb66c5df27aad17d9 100644 (file)
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -124,7 +124,7 @@ extern void __devinit calibrate_delay (void);
 extern void start_ap (void);
 extern unsigned long ia64_iobase;
 
-task_t *task_for_booting_cpu;
+struct task_struct *task_for_booting_cpu;
 
 /*
  * State for each CPU
@@ -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);