Index: sys/kern/kern_event.c
===================================================================
--- sys/kern/kern_event.c
+++ sys/kern/kern_event.c
@@ -481,21 +481,17 @@
 filt_proc(struct knote *kn, long hint)
 {
 	struct proc *p;
-	u_int event;
 
 	p = kn->kn_ptr.p_proc;
 	if (p == NULL) /* already activated, from attach filter */
 		return (0);
 
-	/* Mask off extra data. */
-	event = (u_int)hint & NOTE_PCTRLMASK;
-
 	/* If the user is interested in this event, record it. */
-	if (kn->kn_sfflags & event)
-		kn->kn_fflags |= event;
+	if ((kn->kn_sfflags & hint) != 0)
+		kn->kn_fflags |= hint;
 
 	/* Process is gone, so flag the event as finished. */
-	if (event == NOTE_EXIT) {
+	if (hint == NOTE_EXIT) {
 		kn->kn_flags |= EV_EOF | EV_ONESHOT;
 		kn->kn_ptr.p_proc = NULL;
 		if (kn->kn_fflags & NOTE_EXIT)
Index: sys/kern/sys_procdesc.c
===================================================================
--- sys/kern/sys_procdesc.c
+++ sys/kern/sys_procdesc.c
@@ -464,7 +464,6 @@
 procdesc_kqops_event(struct knote *kn, long hint)
 {
 	struct procdesc *pd;
-	u_int event;
 
 	pd = kn->kn_fp->f_data;
 	if (hint == 0) {
@@ -472,18 +471,15 @@
 		 * Initial test after registration. Generate a NOTE_EXIT in
 		 * case the process already terminated before registration.
 		 */
-		event = pd->pd_flags & PDF_EXITED ? NOTE_EXIT : 0;
-	} else {
-		/* Mask off extra data. */
-		event = (u_int)hint & NOTE_PCTRLMASK;
+		hint = pd->pd_flags & PDF_EXITED ? NOTE_EXIT : 0;
 	}
 
 	/* If the user is interested in this event, record it. */
-	if (kn->kn_sfflags & event)
-		kn->kn_fflags |= event;
+	if ((kn->kn_sfflags & hint) != 0)
+		kn->kn_fflags |= hint;
 
 	/* Process is gone, so flag the event as finished. */
-	if (event == NOTE_EXIT) {
+	if (hint == NOTE_EXIT) {
 		kn->kn_flags |= EV_EOF | EV_ONESHOT;
 		if (kn->kn_fflags & NOTE_EXIT)
 			kn->kn_data = pd->pd_xstat;
Index: sys/sys/event.h
===================================================================
--- sys/sys/event.h
+++ sys/sys/event.h
@@ -141,8 +141,6 @@
 #define	NOTE_EXIT	0x80000000		/* process exited */
 #define	NOTE_FORK	0x40000000		/* process forked */
 #define	NOTE_EXEC	0x20000000		/* process exec'd */
-#define	NOTE_PCTRLMASK	0xf0000000		/* mask for hint bits */
-#define	NOTE_PDATAMASK	0x000fffff		/* mask for pid */
 
 /* additional flags for EVFILT_PROC */
 #define	NOTE_TRACK	0x00000001		/* follow across forks */