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-rw-r--r--init/calibrate.c36
1 files changed, 19 insertions, 17 deletions
diff --git a/init/calibrate.c b/init/calibrate.c
index ecb3822d4f70..86286974dada 100644
--- a/init/calibrate.c
+++ b/init/calibrate.c
@@ -8,7 +8,9 @@
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/timex.h>
+#include <linux/smp.h>
+unsigned long lpj_tsc;
unsigned long preset_lpj;
static int __init lpj_setup(char *str)
{
@@ -108,6 +110,10 @@ static unsigned long __cpuinit calibrate_delay_direct(void) {return 0;}
* This is the number of bits of precision for the loops_per_jiffy. Each
* 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
+ * the cpu frequency, hence do the calibration for those.
*/
#define LPS_PREC 8
@@ -118,20 +124,20 @@ void __cpuinit calibrate_delay(void)
if (preset_lpj) {
loops_per_jiffy = preset_lpj;
- printk("Calibrating delay loop (skipped)... "
- "%lu.%02lu BogoMIPS preset\n",
- loops_per_jiffy/(500000/HZ),
- (loops_per_jiffy/(5000/HZ)) % 100);
+ printk(KERN_INFO
+ "Calibrating delay loop (skipped) preset value.. ");
+ } else if ((smp_processor_id() == 0) && lpj_tsc) {
+ loops_per_jiffy = lpj_tsc;
+ printk(KERN_INFO
+ "Calibrating delay loop (skipped), "
+ "using tsc calculated value.. ");
} else if ((loops_per_jiffy = calibrate_delay_direct()) != 0) {
- printk("Calibrating delay using timer specific routine.. ");
- printk("%lu.%02lu BogoMIPS (lpj=%lu)\n",
- loops_per_jiffy/(500000/HZ),
- (loops_per_jiffy/(5000/HZ)) % 100,
- loops_per_jiffy);
+ printk(KERN_INFO
+ "Calibrating delay using timer specific routine.. ");
} else {
loops_per_jiffy = (1<<12);
- printk(KERN_DEBUG "Calibrating delay loop... ");
+ printk(KERN_INFO "Calibrating delay loop... ");
while ((loops_per_jiffy <<= 1) != 0) {
/* wait for "start of" clock tick */
ticks = jiffies;
@@ -161,12 +167,8 @@ void __cpuinit calibrate_delay(void)
if (jiffies != ticks) /* longer than 1 tick */
loops_per_jiffy &= ~loopbit;
}
-
- /* Round the value and print it */
- printk("%lu.%02lu BogoMIPS (lpj=%lu)\n",
- loops_per_jiffy/(500000/HZ),
- (loops_per_jiffy/(5000/HZ)) % 100,
- loops_per_jiffy);
}
-
+ printk(KERN_INFO "%lu.%02lu BogoMIPS (lpj=%lu)\n",
+ loops_per_jiffy/(500000/HZ),
+ (loops_per_jiffy/(5000/HZ)) % 100, loops_per_jiffy);
}