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From: Andriy Gapon <avg@FreeBSD.org>
Date: Thu, 11 Jul 2013 12:42:46 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r253203 - stable/9/sys/kern
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Author: avg
Date: Thu Jul 11 12:42:46 2013
New Revision: 253203
URL: http://svnweb.freebsd.org/changeset/base/253203

Log:
  MFC r253077: should_yield: protect from td_swvoltick being uninitialized
  or too stale

Modified:
  stable/9/sys/kern/kern_synch.c
Directory Properties:
  stable/9/sys/   (props changed)

Modified: stable/9/sys/kern/kern_synch.c
==============================================================================
--- stable/9/sys/kern/kern_synch.c	Thu Jul 11 09:27:56 2013	(r253202)
+++ stable/9/sys/kern/kern_synch.c	Thu Jul 11 12:42:46 2013	(r253203)
@@ -578,7 +578,7 @@ int
 should_yield(void)
 {
 
-	return (ticks - curthread->td_swvoltick >= hogticks);
+	return ((unsigned int)(ticks - curthread->td_swvoltick) >= hogticks);
 }
 
 void