While attempting to port Linux to a new platform using a compiler other
then GCC I noticed that there appears to be a volatile missing on the
declaration of xtime in include/linux/sched.h.  The compiler I am using
considers this to be an error.  The following may help your problem.




include/linux/sched.h
*** sched.h     2001/02/05 21:48:10     1.3
--- sched.h     2001/02/07 05:19:09
***************
*** 533,539 ****
  extern unsigned long volatile jiffies;
  extern unsigned long itimer_ticks;
  extern unsigned long itimer_next;
! extern struct timeval xtime;
  extern void do_timer(struct pt_regs *);
  
  extern unsigned int * prof_buffer;
--- 533,539 ----
  extern unsigned long volatile jiffies;
  extern unsigned long itimer_ticks;
  extern unsigned long itimer_next;
! extern volatile struct timeval xtime;
  extern void do_timer(struct pt_regs *);


Ulrich Windl writes:
> 
> Hello,
> 
> I have some news on the topic of timekeeping in Linux-2.4:
> 
> As Alan Cox pointed out the ACPI changes between 2.4.0 and 2.4.1 created a 
> extremely slow console output (if not more). Configuring away ACPI support 
> solved that problem.
> 
> However there is still a problem that I cannot explain. I wrote a test program 
> for my modified kernel (I did not try the original one). I'll include the 
> program plus results (if you want to see the patch go to 
> ftp.kernel.org/pub/linux/daemons/ntp/PPS and get PPS-2.4.0-pre3.tar.bz2 (patch 
> plus signature)):
> 
> #include      <time.h>
> #include      <stdio.h>
> #define       NTP_NANO
> #include      <sys/timex.h>
> 
> int   main()
> {
>       struct timex    tx;
>       long            lastns = 0;
> 
>       tx.modes = 0;
>       while(1)
>       {
>               adjtimex(&tx);
>               printf("%d %d %d\n",
>                      tx.time.tv_sec, tx.time.tv_nsec,
>                      tx.time.tv_nsec - lastns);
>               lastns = tx.time.tv_nsec;
>               fflush(stdout);
>       }
> }


-- 
Steve Piatz                             [EMAIL PROTECTED]
Cray Inc.                               651-605-9049
1340 Mendota Heights Road
Mendota Heights, MN 55120
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