PERFORCE change 87476 for review

[Peter Wemm]

http://perforce.freebsd.org/chv.cgi?CH=87476

Change 87476 by peter at peter_melody on 2005/11/29 21:48:37

	Handle wraparound, in case we happen to be doing a DELAY as we cross
	an uptime of about 140 years on a 2GHz machine.  One can never be too
	safe! :-)

Affected files ...

.. //depot/projects/hammer/sys/amd64/isa/clock.c#53 edit

Differences ...

==== //depot/projects/hammer/sys/amd64/isa/clock.c#53 (text+ko) ====

@@ -280,7 +280,7 @@
 		end = start + (tsc_freq * n) / 1000000;
 		do {
 			now = rdtsc();
-		} while (now < end);
+		} while (now < end || (now > start && end < start));
 		sched_unpin();
 		return;
 	}