Merge branch 'perf/core' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux...

[pandora-kernel.git] / init / calibrate.c

diff --git a/init/calibrate.c b/init/calibrate.c
index 2568d22..24df797 100644 (file)
--- a/init/calibrate.c
+++ b/init/calibrate.c
@@ -9,6 +9,7 @@
 #include <linux/init.h>
 #include <linux/timex.h>
 #include <linux/smp.h>
+#include <linux/percpu.h>
 
 unsigned long lpj_fine;
 unsigned long preset_lpj;
@@ -243,32 +244,42 @@ recalibrate:
        return lpj;
 }
 
+static DEFINE_PER_CPU(unsigned long, cpu_loops_per_jiffy) = { 0 };
+
 void __cpuinit calibrate_delay(void)
 {
+       unsigned long lpj;
        static bool printed;
+       int this_cpu = smp_processor_id();
 
-       if (preset_lpj) {
-               loops_per_jiffy = preset_lpj;
+       if (per_cpu(cpu_loops_per_jiffy, this_cpu)) {
+               lpj = per_cpu(cpu_loops_per_jiffy, this_cpu);
+               pr_info("Calibrating delay loop (skipped) "
+                               "already calibrated this CPU");
+       } else if (preset_lpj) {
+               lpj = preset_lpj;
                if (!printed)
                        pr_info("Calibrating delay loop (skipped) "
                                "preset value.. ");
        } else if ((!printed) && lpj_fine) {
-               loops_per_jiffy = lpj_fine;
+               lpj = lpj_fine;
                pr_info("Calibrating delay loop (skipped), "
                        "value calculated using timer frequency.. ");
-       } else if ((loops_per_jiffy = calibrate_delay_direct()) != 0) {
+       } else if ((lpj = calibrate_delay_direct()) != 0) {
                if (!printed)
                        pr_info("Calibrating delay using timer "
                                "specific routine.. ");
        } else {
                if (!printed)
                        pr_info("Calibrating delay loop... ");
-               loops_per_jiffy = calibrate_delay_converge();
+               lpj = calibrate_delay_converge();
        }
+       per_cpu(cpu_loops_per_jiffy, this_cpu) = lpj;
        if (!printed)
                pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
-                       loops_per_jiffy/(500000/HZ),
-                       (loops_per_jiffy/(5000/HZ)) % 100, loops_per_jiffy);
+                       lpj/(500000/HZ),
+                       (lpj/(5000/HZ)) % 100, lpj);
 
+       loops_per_jiffy = lpj;
        printed = true;
 }