summaryrefslogtreecommitdiffstats
path: root/init
diff options
context:
space:
mode:
authorIngo Molnar <mingo@elte.hu>2008-07-18 21:13:20 +0200
committerIngo Molnar <mingo@elte.hu>2008-07-18 21:13:20 +0200
commitf6dc8ccaab6d8f63cbae1e6c73fe972b26f5376c (patch)
treec5643fcdc884a8d0bfc3f1bc28039cab7394e5bc /init
parent323ec001c6bb98eeabb5abbdbb8c8055d9496554 (diff)
parent5b664cb235e97afbf34db9c4d77f08ebd725335e (diff)
downloadlinux-f6dc8ccaab6d8f63cbae1e6c73fe972b26f5376c.tar.gz
linux-f6dc8ccaab6d8f63cbae1e6c73fe972b26f5376c.tar.bz2
linux-f6dc8ccaab6d8f63cbae1e6c73fe972b26f5376c.zip
Merge branch 'linus' into core/generic-dma-coherent
Conflicts: kernel/Makefile Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'init')
-rw-r--r--init/calibrate.c60
-rw-r--r--init/do_mounts.c3
-rw-r--r--init/main.c3
3 files changed, 37 insertions, 29 deletions
diff --git a/init/calibrate.c b/init/calibrate.c
index ecb3822d4f70..7963e3fc51d9 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_fine;
unsigned long preset_lpj;
static int __init lpj_setup(char *str)
{
@@ -33,9 +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 )
@@ -79,22 +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");
@@ -108,6 +112,10 @@ 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 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
@@ -118,20 +126,20 @@ 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_fine) {
+ loops_per_jiffy = lpj_fine;
+ printk(KERN_INFO
+ "Calibrating delay loop (skipped), "
+ "value calculated using timer frequency.. ");
} 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 +169,8 @@ 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);
}
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 660c1e50c91b..a1de1bf3d6b9 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -372,7 +372,8 @@ void __init prepare_namespace(void)
if (saved_root_name[0]) {
root_device_name = saved_root_name;
- if (!strncmp(root_device_name, "mtd", 3)) {
+ if (!strncmp(root_device_name, "mtd", 3) ||
+ !strncmp(root_device_name, "ubi", 3)) {
mount_block_root(root_device_name, root_mountflags);
goto out;
}
diff --git a/init/main.c b/init/main.c
index f7fb20021d48..edeace036fd9 100644
--- a/init/main.c
+++ b/init/main.c
@@ -31,6 +31,7 @@
#include <linux/kernel_stat.h>
#include <linux/start_kernel.h>
#include <linux/security.h>
+#include <linux/smp.h>
#include <linux/workqueue.h>
#include <linux/profile.h>
#include <linux/rcupdate.h>
@@ -758,6 +759,7 @@ static void __init do_initcalls(void)
*/
static void __init do_basic_setup(void)
{
+ rcu_init_sched(); /* needed by module_init stage. */
/* drivers will send hotplug events */
init_workqueues();
usermodehelper_init();
@@ -779,6 +781,7 @@ static void __init do_pre_smp_initcalls(void)
{
extern int spawn_ksoftirqd(void);
+ init_call_single_data();
migration_init();
spawn_ksoftirqd();
if (!nosoftlockup)