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From: Peter Wemm <peter@FreeBSD.org>
To: Perforce Change Reviews <perforce@freebsd.org>
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Subject: PERFORCE change 87453 for review
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http://perforce.freebsd.org/chv.cgi?CH=87453

Change 87453 by peter@peter_daintree on 2005/11/29 18:50:05

	Use sched_pin on the chance that DELAY() is called with interrupts
	enabled.  It is cheap and harmless.

Affected files ...

.. //depot/projects/hammer/sys/amd64/isa/clock.c#52 edit

Differences ...

==== //depot/projects/hammer/sys/amd64/isa/clock.c#52 (text+ko) ====

@@ -61,6 +61,7 @@
 #include <sys/kernel.h>
 #include <sys/limits.h>
 #include <sys/module.h>
+#include <sys/sched.h>
 #include <sys/sysctl.h>
 #include <sys/cons.h>
 #include <sys/power.h>
@@ -274,11 +275,13 @@
 	if (tsc_freq != 0 && !tsc_is_broken) {
 		uint64_t start, end, now;
 
+		sched_pin();
 		start = rdtsc();
 		end = start + (tsc_freq * n) / 1000000;
 		do {
 			now = rdtsc();
-		} while (now < end || (now > start && end < start));
+		} while (now < end);
+		sched_unpin();
 		return;
 	}
 #ifdef DELAYDEBUG