Re: Jiffies Wraparound (was Re: interrupt counts)
Richard Henderson (richard@atheist.tamu.edu)
Wed, 21 Aug 1996 13:49:48 -0500 (CDT)
> IMHO, we either should forget about it and wait for Merced or anything
> else to move us out of the 32 bit world ... or we should completely avoid
> comparing "jiffies" to variables. We could do this the following way:
>
> #define IS_TIMED_OUT(timeout) (jiffies>timeout) || \
> (timeout-jiffies>MAX_JIFFIES/2)
Just rewriting tests from
timeout = jiffies + delay;
while (jifies < timeout) continue;
to
start = jiffies;
while (jiffies - start < delay) continue;
solves the problem, and is much faster.
r~