Pull percpu-dtc into release branch

[pandora-kernel.git] / arch / ia64 / kernel / smpboot.c

diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index b21ddec..ff7df43 100644 (file)
--- 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