Hi,
I am working on writing a module which uses the hrtimre struct to find the resolution of the kernel. Here is the module:
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/hrtimer.h>
#include <linux/fs.h>
#include <linux/posix-timers.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/hrtimer.h>
#include <linux/fs.h>
#include <linux/posix-timers.h>
static int begin_func(void *data);
static int begin_func(void *data)
{
int i,sum;
sum = 0;
for(i = 0; i < 10; i++)
{
sum = sum + i*i + i*i;
}
return sum;
}
static int __init calib_init(void)
{
struct hrtimer *timer;
void *temp;
ktime_t starts = ktime_set(1,0); /* one second, zero nsecs */
timer->function = begin_func;
timer->data = "" *)temp;
hrtimer_start(timer, starts, HRTIMER_REL);
printk(KERN_INFO "Hello, world \n");
return 0;
}
static void __exit calib_exit(void)
{
printk(KERN_INFO "Goodbye, world\n");
}
module_init(calib_init);
module_exit(calib_exit);
extern int hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode);
extern int hrtimer_cancel(struct hrtimer *timer);*/
static int begin_func(void *data);
static int begin_func(void *data)
{
int i,sum;
sum = 0;
for(i = 0; i < 10; i++)
{
sum = sum + i*i + i*i;
}
return sum;
}
static int __init calib_init(void)
{
struct hrtimer *timer;
void *temp;
ktime_t starts = ktime_set(1,0); /* one second, zero nsecs */
timer->function = begin_func;
timer->data = "" *)temp;
hrtimer_start(timer, starts, HRTIMER_REL);
printk(KERN_INFO "Hello, world \n");
return 0;
}
static void __exit calib_exit(void)
{
printk(KERN_INFO "Goodbye, world\n");
}
module_init(calib_init);
module_exit(calib_exit);
When I compile the above module, HERE is the output:
-bash-2.05b$ make
make -C /lib/modules/2.6.15-rt16-groupsched-dski-skas3-v8.2y/build M=/users/dheeraj/EECS750/umk/calibrate modules
make[1]: Entering directory `/home/dheeraj/svn/groupsched-dski/2.6.15-rt16-groupsched-dski_skas'
make[2]: Warning: File `/users/dheeraj/EECS750/umk/calibrate/calibrate.c' has modification time 3.5e+02 s in the future
CC [M] /users/dheeraj/EECS750/umk/calibrate/calibrate.o
/users/dheeraj/EECS750/umk/calibrate/calibrate.c: In function `calib_init':
/users/dheeraj/EECS750/umk/calibrate/calibrate.c:36: warning: `timer'
might be used uninitialized in this function
--------------------------------------------1
/users/dheeraj/EECS750/umk/calibrate/calibrate.c:37: warning: `temp'
might be used uninitialized in this function
---------------------------------------------2
make[2]: warning: Clock skew detected. Your build may be incomplete.
Building modules, stage 2.
make[2]: Warning: File `/users/dheeraj/EECS750/umk/calibrate/calibrate.o' has modification time 3.7e+02 s in the future
MODPOST
*** Warning: "hrtimer_start" [/users/dheeraj/EECS750/umk/calibrate/calibrate.ko] undefined!
CC /users/dheeraj/EECS750/umk/calibrate/calibrate.mod.o
LD [M] /users/dheeraj/EECS750/umk/calibrate/calibrate.ko
make[2]: warning: Clock skew detected. Your build may be incomplete.
make[1]: Leaving directory `/home/dheeraj/svn/groupsched-dski/2.6.15-rt16-groupsched-dski_skas'
------------------------------------------------------------------------------------------------------------------------------------------------------------
How can I correct the warning of eq.s 1,2? the hrtimer struct belongs to hrtimer.c
Thanks,
Jack
