x86: use cpu_khz for loops_per_jiffy calculation, cleanup

As suggested by Ingo, remove all references to tsc from init/calibrate.c

TSC is x86 specific, and using tsc in variable names in a generic file should
be avoided. lpj_tsc is now called lpj_fine, since it is related to fine tuning
of lpj value. Also tsc_rate_*  is called timer_rate_*

Signed-off-by: Alok N Kataria <akataria@vmware.com>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Daniel Hecht <dhecht@vmware.com>
Cc: Tim Mann <mann@vmware.com>
Cc: Zach Amsden <zach@vmware.com>
Cc: Sahil Rihan <srihan@vmware.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 19 insertions, 17 deletions

diff --git a/init/calibrate.c b/init/calibrate.c
index 86286974dada..7963e3fc51d9 100644
--- a/init/calibrate.c
+++ b/init/calibrate.c
@@ -10,7 +10,7 @@
 #include <linux/timex.h>
 #include <linux/smp.h>
 
-unsigned long lpj_tsc;
+unsigned long lpj_fine;
 unsigned long preset_lpj;
 static int __init lpj_setup(char *str)
 {
@@ -35,9 +35,9 @@ static unsigned long __cpuinit calibrate_delay_direct(void)
         unsigned long pre_start, start, post_start;
         unsigned long pre_end, end, post_end;
         unsigned long start_jiffies;
-        unsigned long tsc_rate_min, tsc_rate_max;
-        unsigned long good_tsc_sum = 0;
-        unsigned long good_tsc_count = 0;
+        unsigned long timer_rate_min, timer_rate_max;
+        unsigned long good_timer_sum = 0;
+        unsigned long good_timer_count = 0;
         int i;
 
         if (read_current_timer(&pre_start) < 0 )
@@ -81,22 +81,24 @@ static unsigned long __cpuinit calibrate_delay_direct(void)
                 }
                 read_current_timer(&post_end);
 
-                tsc_rate_max = (post_end - pre_start) / DELAY_CALIBRATION_TICKS;
-                tsc_rate_min = (pre_end - post_start) / DELAY_CALIBRATION_TICKS;
+                timer_rate_max = (post_end - pre_start) /
+                                        DELAY_CALIBRATION_TICKS;
+                timer_rate_min = (pre_end - post_start) /
+                                        DELAY_CALIBRATION_TICKS;
 
                 /*
-                 * If the upper limit and lower limit of the tsc_rate is
+                 * If the upper limit and lower limit of the timer_rate is
                  * >= 12.5% apart, redo calibration.
                  */
                 if (pre_start != 0 && pre_end != 0 &&
-                    (tsc_rate_max - tsc_rate_min) < (tsc_rate_max >> 3)) {
-                        good_tsc_count++;
-                        good_tsc_sum += tsc_rate_max;
+                    (timer_rate_max - timer_rate_min) < (timer_rate_max >> 3)) {
+                        good_timer_count++;
+                        good_timer_sum += timer_rate_max;
                 }
         }
 
-        if (good_tsc_count)
-                return (good_tsc_sum/good_tsc_count);
+        if (good_timer_count)
+                return (good_timer_sum/good_timer_count);
 
         printk(KERN_WARNING "calibrate_delay_direct() failed to get a good "
                "estimate for loops_per_jiffy.\nProbably due to long platform interrupts. Consider using \"lpj=\" boot option.\n");
@@ -111,8 +113,8 @@ static unsigned long __cpuinit calibrate_delay_direct(void) {return 0;}
  * bit takes on average 1.5/HZ seconds.  This (like the original) is a little
  * better than 1%
  * For the boot cpu we can skip the delay calibration and assign it a value
- * calculated based on the tsc frequency.
- * For the rest of the CPUs we cannot assume that the tsc frequency is same as
+ * calculated based on the timer frequency.
+ * For the rest of the CPUs we cannot assume that the timer frequency is same as
  * the cpu frequency, hence do the calibration for those.
  */
 #define LPS_PREC 8
@@ -126,11 +128,11 @@ void __cpuinit calibrate_delay(void)
                 loops_per_jiffy = preset_lpj;
                 printk(KERN_INFO
                         "Calibrating delay loop (skipped) preset value.. ");
-        } else if ((smp_processor_id() == 0) && lpj_tsc) {
-                loops_per_jiffy = lpj_tsc;
+        } else if ((smp_processor_id() == 0) && lpj_fine) {
+                loops_per_jiffy = lpj_fine;
                 printk(KERN_INFO
                         "Calibrating delay loop (skipped), "
-                        "using tsc calculated value.. ");
+                        "value calculated using timer frequency.. ");
         } else if ((loops_per_jiffy = calibrate_delay_direct()) != 0) {
                 printk(KERN_INFO
                         "Calibrating delay using timer specific routine.. ");