diff --git a/sys/kern/kern_switch.c b/sys/kern/kern_switch.c
--- a/sys/kern/kern_switch.c
+++ b/sys/kern/kern_switch.c
@@ -83,20 +83,16 @@
 SYSCTL_NODE(_kern_sched, OID_AUTO, stats, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
     "switch stats");
 
-/* Switch reasons from mi_switch(). */
+/* Switch reasons from mi_switch(9). */
 DPCPU_DEFINE(long, sched_switch_stats[SWT_COUNT]);
 SCHED_STAT_DEFINE_VAR(uncategorized,
     &DPCPU_NAME(sched_switch_stats[SWT_NONE]), "");
-SCHED_STAT_DEFINE_VAR(preempt,
-    &DPCPU_NAME(sched_switch_stats[SWT_PREEMPT]), "");
 SCHED_STAT_DEFINE_VAR(owepreempt,
     &DPCPU_NAME(sched_switch_stats[SWT_OWEPREEMPT]), "");
 SCHED_STAT_DEFINE_VAR(turnstile,
     &DPCPU_NAME(sched_switch_stats[SWT_TURNSTILE]), "");
 SCHED_STAT_DEFINE_VAR(sleepq,
     &DPCPU_NAME(sched_switch_stats[SWT_SLEEPQ]), "");
-SCHED_STAT_DEFINE_VAR(sleepqtimo,
-    &DPCPU_NAME(sched_switch_stats[SWT_SLEEPQTIMO]), "");
 SCHED_STAT_DEFINE_VAR(relinquish, 
     &DPCPU_NAME(sched_switch_stats[SWT_RELINQUISH]), "");
 SCHED_STAT_DEFINE_VAR(needresched,
diff --git a/sys/sys/proc.h b/sys/sys/proc.h
--- a/sys/sys/proc.h
+++ b/sys/sys/proc.h
@@ -904,22 +904,20 @@
 
 #ifdef _KERNEL
 
-/* Types and flags for mi_switch(). */
+/* Types and flags for mi_switch(9). */
 #define	SW_TYPE_MASK		0xff	/* First 8 bits are switch type */
 #define	SWT_NONE		0	/* Unspecified switch. */
-#define	SWT_PREEMPT		1	/* Switching due to preemption. */
-#define	SWT_OWEPREEMPT		2	/* Switching due to owepreempt. */
-#define	SWT_TURNSTILE		3	/* Turnstile contention. */
-#define	SWT_SLEEPQ		4	/* Sleepq wait. */
-#define	SWT_SLEEPQTIMO		5	/* Sleepq timeout wait. */
-#define	SWT_RELINQUISH		6	/* yield call. */
-#define	SWT_NEEDRESCHED		7	/* NEEDRESCHED was set. */
-#define	SWT_IDLE		8	/* Switching from the idle thread. */
-#define	SWT_IWAIT		9	/* Waiting for interrupts. */
-#define	SWT_SUSPEND		10	/* Thread suspended. */
-#define	SWT_REMOTEPREEMPT	11	/* Remote processor preempted. */
-#define	SWT_REMOTEWAKEIDLE	12	/* Remote processor preempted idle. */
-#define	SWT_COUNT		13	/* Number of switch types. */
+#define	SWT_OWEPREEMPT		1	/* Switching due to owepreempt. */
+#define	SWT_TURNSTILE		2	/* Turnstile contention. */
+#define	SWT_SLEEPQ		3	/* Sleepq wait. */
+#define	SWT_RELINQUISH		4	/* yield call. */
+#define	SWT_NEEDRESCHED		5	/* NEEDRESCHED was set. */
+#define	SWT_IDLE		6	/* Switching from the idle thread. */
+#define	SWT_IWAIT		7	/* Waiting for interrupts. */
+#define	SWT_SUSPEND		8	/* Thread suspended. */
+#define	SWT_REMOTEPREEMPT	9	/* Remote processor preempted. */
+#define	SWT_REMOTEWAKEIDLE	10	/* Remote processor preempted idle. */
+#define	SWT_COUNT		11	/* Number of switch types. */
 /* Flags */
 #define	SW_VOL		0x0100		/* Voluntary switch. */
 #define	SW_INVOL	0x0200		/* Involuntary switch. */