svn commit: r241637 - stable/9/sys/kern
Andriy Gapon
avg at FreeBSD.org
Wed Oct 17 11:30:14 UTC 2012
Author: avg
Date: Wed Oct 17 11:30:14 2012
New Revision: 241637
URL: http://svn.freebsd.org/changeset/base/241637
Log:
MFC r241295: cngetc: use cpu_spinwait to ease the cncheckc loop a tiny bit
Modified:
stable/9/sys/kern/kern_cons.c
Directory Properties:
stable/9/sys/ (props changed)
Modified: stable/9/sys/kern/kern_cons.c
==============================================================================
--- stable/9/sys/kern/kern_cons.c Wed Oct 17 11:30:00 2012 (r241636)
+++ stable/9/sys/kern/kern_cons.c Wed Oct 17 11:30:14 2012 (r241637)
@@ -384,7 +384,7 @@ cngetc(void)
if (cn_mute)
return (-1);
while ((c = cncheckc()) == -1)
- ;
+ cpu_spinwait();
if (c == '\r')
c = '\n'; /* console input is always ICRNL */
return (c);
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