X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=blobdiff_plain;f=arch%2Fia64%2Fkernel%2Fsmpboot.c;h=ff7df439da6da98a3ecd222600866aeade40ace5;hp=6203ed4ec8cfadbab3a6d77f055633ad055cc8c8;hb=b643b0fdbc59cf6bbb086974b29d2571e9e9f646;hpb=075395d228641646159dae3dd170fa3fc6ff477a

diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index 6203ed4ec8cf..ff7df439da6d 100644
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -375,6 +375,7 @@ static void __devinit
 smp_callin (void)
 {
 	int cpuid, phys_id, itc_master;
+	struct cpuinfo_ia64 *last_cpuinfo, *this_cpuinfo;
 	extern void ia64_init_itm(void);
 	extern volatile int time_keeper_id;
 
@@ -424,7 +425,21 @@ smp_callin (void)
 	 * Get our bogomips.
 	 */
 	ia64_init_itm();
-	calibrate_delay();
+
+	/*
+	 * Delay calibration can be skipped if new processor is identical to the
+	 * previous processor.
+	 */
+	last_cpuinfo = cpu_data(cpuid - 1);
+	this_cpuinfo = local_cpu_data;
+	if (last_cpuinfo->itc_freq != this_cpuinfo->itc_freq ||
+	    last_cpuinfo->proc_freq != this_cpuinfo->proc_freq ||
+	    last_cpuinfo->features != this_cpuinfo->features ||
+	    last_cpuinfo->revision != this_cpuinfo->revision ||
+	    last_cpuinfo->family != this_cpuinfo->family ||
+	    last_cpuinfo->archrev != this_cpuinfo->archrev ||
+	    last_cpuinfo->model != this_cpuinfo->model)
+		calibrate_delay();
 	local_cpu_data->loops_per_jiffy = loops_per_jiffy;
 
 #ifdef CONFIG_IA32_SUPPORT
@@ -463,15 +478,17 @@ struct pt_regs * __devinit idle_regs(struct pt_regs *regs)
 }
 
 struct create_idle {
+	struct work_struct work;
 	struct task_struct *idle;
 	struct completion done;
 	int cpu;
 };
 
 void
-do_fork_idle(void *_c_idle)
+do_fork_idle(struct work_struct *work)
 {
-	struct create_idle *c_idle = _c_idle;
+	struct create_idle *c_idle =
+		container_of(work, struct create_idle, work);
 
 	c_idle->idle = fork_idle(c_idle->cpu);
 	complete(&c_idle->done);
@@ -482,10 +499,10 @@ do_boot_cpu (int sapicid, int cpu)
 {
 	int timeout;
 	struct create_idle c_idle = {
+		.work = __WORK_INITIALIZER(c_idle.work, do_fork_idle),
 		.cpu	= cpu,
 		.done	= COMPLETION_INITIALIZER(c_idle.done),
 	};
-	DECLARE_WORK(work, do_fork_idle, &c_idle);
 
  	c_idle.idle = get_idle_for_cpu(cpu);
  	if (c_idle.idle) {
@@ -497,9 +514,9 @@ do_boot_cpu (int sapicid, int cpu)
 	 * We can't use kernel_thread since we must avoid to reschedule the child.
 	 */
 	if (!keventd_up() || current_is_keventd())
-		work.func(work.data);
+		c_idle.work.func(&c_idle.work);
 	else {
-		schedule_work(&work);
+		schedule_work(&c_idle.work);
 		wait_for_completion(&c_idle.done);
 	}
 
@@ -879,3 +896,27 @@ 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);