[parisc-linux] teaching the kernel to do division

[Randolph Chung <randolph@tausq.org>]

I was investigating why nanosleep() doesn't return the correct remaining
time with a 2.6 kernel... turns out the kernel doesn't seem to know 
how to do division properly :-(

kernel/posix-timers.c has:

                tsave->tv_sec = div_long_long_rem(left,
                                                  NSEC_PER_SEC,
                                                  &tsave->tv_nsec);

which eventually calls __div64_32() in lib/div64.c

if you test that function, you see that it does weird things. For
example, it tells me that:

28999591392 / 1000000000 = 3, remainder = 229787616

<sigh>

does anyone want to look into fixing it, and/or writing an optimized
version of that function for pa? :-) it needs to do basically this (but
be standalone)

uint32_t div64(uint64_t *n, uint32_t base)
{
        uint32_t rem;

        rem = *n % base;
        *n = *n / base;

        return rem;
}

thanks :)
randolph
-- 
Randolph Chung
Debian GNU/Linux Developer, hppa/ia64 ports
http://www.tausq.org/