[Midnightbsd-cvs] src [8215] trunk/sys/kern/kern_cons.c: use cpu_spinwait to ease loop

[laffer1 at midnightbsd.org]

Revision: 8215
          http://svnweb.midnightbsd.org/src/?rev=8215
Author:   laffer1
Date:     2016-09-17 16:21:56 -0400 (Sat, 17 Sep 2016)
Log Message:
-----------
use cpu_spinwait to ease loop

Modified Paths:
--------------
    trunk/sys/kern/kern_cons.c

Modified: trunk/sys/kern/kern_cons.c
===================================================================
--- trunk/sys/kern/kern_cons.c	2016-09-17 20:21:30 UTC (rev 8214)
+++ trunk/sys/kern/kern_cons.c	2016-09-17 20:21:56 UTC (rev 8215)
@@ -384,7 +384,7 @@
 	if (cn_mute)
 		return (-1);
 	while ((c = cncheckc()) == -1)
-		;
+		cpu_spinwait();
 	if (c == '\r')
 		c = '\n';		/* console input is always ICRNL */
 	return (c);