cngetc: use cpu_spinwait to ease the cncheckc loop a tiny bit

Reviewed by: julian MFC after: 10 days
2012-10-06 19:50:23 +00:00 · 2012-10-06 19:50:23 +00:00 · 298fbd1605
commit 298fbd1605
parent 9d200697d7
1 changed files with 1 additions and 1 deletions
--- a/sys/kern/kern_cons.c
+++ b/sys/kern/kern_cons.c
@ -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);