PERFORCE change 84543 for review

[John Baldwin]

http://perforce.freebsd.org/chv.cgi?CH=84543

Change 84543 by jhb at jhb_slimer on 2005/09/30 12:57:36

	Initialize mutex backing dev_lock in mutex_init() to cut down on
	the overhead in dev_lock().

Affected files ...

.. //depot/projects/smpng/sys/kern/kern_conf.c#43 edit
.. //depot/projects/smpng/sys/kern/kern_mutex.c#105 edit

Differences ...

==== //depot/projects/smpng/sys/kern/kern_conf.c#43 (text+ko) ====

@@ -57,8 +57,7 @@
 void
 dev_lock(void)
 {
-	if (!mtx_initialized(&devmtx))
-		mtx_init(&devmtx, "cdev", NULL, MTX_DEF);
+
 	mtx_lock(&devmtx);
 }
 

==== //depot/projects/smpng/sys/kern/kern_mutex.c#105 (text+ko) ====

@@ -935,5 +935,6 @@
 	mtx_init(&Giant, "Giant", NULL, MTX_DEF | MTX_RECURSE);
 	mtx_init(&sched_lock, "sched lock", NULL, MTX_SPIN | MTX_RECURSE);
 	mtx_init(&proc0.p_mtx, "process lock", NULL, MTX_DEF | MTX_DUPOK);
+	mtx_init(&devmtx, "cdev", NULL, MTX_DEF);
 	mtx_lock(&Giant);
 }