PERFORCE change 95955 for review

[John Birrell]

http://perforce.freebsd.org/chv.cgi?CH=95955

Change 95955 by jb at jb_freebsd2 on 2006/04/23 21:43:32

	Now that the dtrace device supports cloning, it doesn't actually
	need to create a base device at all. In fact, the way that FreeBSD's
	device cloning works, if /dev/dtrace is actually created, then
	cloning fails. Cloning was only working when the base device was
	created as /dev/dtrace0, but it turns out that was just being
	ignored when dtrace(1) opened /dev/dtrace.
	
	So now we have a stealth device. To open it, you just have to trust
	it's there. 8-)

Affected files ...

.. //depot/projects/dtrace/src/sys/cddl/dev/dtrace/dtrace.c#12 edit
.. //depot/projects/dtrace/src/sys/cddl/dev/dtrace/dtrace_load.c#7 edit
.. //depot/projects/dtrace/src/sys/cddl/dev/dtrace/dtrace_unload.c#6 edit

Differences ...

==== //depot/projects/dtrace/src/sys/cddl/dev/dtrace/dtrace.c#12 (text+ko) ====

@@ -90,9 +90,6 @@
 	.d_name		= "dtrace",
 };
 
-/* For use with make_dev(9)/destroy_dev(9). */
-static struct cdev 	*dtrace_dev;
-
 /*
  * DTrace Tunable Variables
  *

==== //depot/projects/dtrace/src/sys/cddl/dev/dtrace/dtrace_load.c#7 (text+ko) ====

@@ -56,10 +56,6 @@
 	dtrace_mutex_init(&dtrace_provider_lock,"dtrace provider state");
 	dtrace_mutex_init(&dtrace_meta_lock,"dtrace meta-provider state");
 
-	/* Create the /dev/dtrace entry. */
-	dtrace_dev = make_dev(&dtrace_cdevsw, DTRACE_MINOR, UID_ROOT,
-	    GID_WHEEL, 0660, "dtrace0");
-
 	mutex_enter(&cpu_lock);
 	mutex_enter(&dtrace_provider_lock);
 	mutex_enter(&dtrace_lock);

==== //depot/projects/dtrace/src/sys/cddl/dev/dtrace/dtrace_unload.c#6 (text+ko) ====

@@ -146,9 +146,6 @@
 	dtrace_taskq = NULL;
 #endif
 
-	/* Destroy the /dev/dtrace entry. */
-	destroy_dev(dtrace_dev);
-
 	dtrace_mutex_destroy(&dtrace_meta_lock);
 	dtrace_mutex_destroy(&dtrace_provider_lock);
 	dtrace_mutex_destroy(&dtrace_lock);