On Thu, 2005-03-17 at 14:29, George Anzinger wrote:
> Liu, Hong wrote:
> > POSIX says: POSIX timers should not expire before their scheduled time.
> > 
> > Due to the timer started between jiffies, there are cases that the timer
> > will expire before its scheduled time.
> > This patch ensures timers will not expire early.
> > 
> > --- a/kernel/posix-timers.c     2005-03-10 15:46:27.329333664 +0800
> > +++ b/kernel/posix-timers.c     2005-03-10 15:50:11.884196136 +0800
> > @@ -957,7 +957,8 @@
> >                             &expire_64, &(timr->wall_to_prev))) {
> >                 return -EINVAL;
> >         }
> > -       timr->it_timer.expires = (unsigned long)expire_64;
> > +       timr->it_timer.expires = (unsigned long)expire_64 + 1;
> >         tstojiffie(&new_setting->it_interval, clock->res, &expire_64);
> >         timr->it_incr = (unsigned long)expire_64;
> > 
> Has this happened??  The following code (in adjust_abs_time()) is supposed to 
> prevent this sort of thing:
> 
> 	if (oc.tv_sec | oc.tv_nsec) {
> 		oc.tv_nsec += clock->res;
> 		timespec_norm(&oc);
> 	}
> 
> Also, we run rather extensive tests for this sort of thing.
> 
The attached case from PosixTestSuite(http://posixtest.sourceforge.net)
failed on IA64 platform.
And if I changed the time interval to N*clock_res in this case, it will
also fail on IA32 platform.


BTW, I can't find the code piece you mentioned in 2.6.11 kernel.